/* $Id: d_mos7.model,v 26.132 2009/11/24 04:26:37 al Exp $ -*- C++ -*-
 * Copyright (C) 2001 Albert Davis
 * Author: Albert Davis <aldavis@gnu.org>
 *
 * This file is part of "Gnucap", the Gnu Circuit Analysis Package
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *------------------------------------------------------------------
 * Berkeley BSIM3v3.1 model
 * Derived from Spice3f4,Copyright 1990 Regents of the University of California
 * Author: 1991 JianHui Huang and Min-Chie Jeng.
 * Recoded for Gnucap model compiler, Al Davis, 2000
 */
h_headers {
#include "d_mos_base.h"
}
cc_headers {
#include "l_compar.h"
#include "l_denoise.h"
}
/*--------------------------------------------------------------------------*/
/*
  from diode
      no fc???
      double bulkJctPotential 
	"Source/drain junction built-in potential"
	name=PB default=1.0;
      double unitAreaJctCap 
	"Source/drain bottom junction capacitance per unit area"
	name=CJ default=5.0E-4;
      double bulkJctBotGradingCoeff 
	"Source/drain bottom junction capacitance grading coefficient"
	name=MJ default=0.5;
      double sidewallJctPotential
	"Source/drain sw junction capacitance built in potential"
	name=PBSW default=1.0;
      double unitLengthSidewallJctCap 
	"Source/drain sw junction capacitance per unit periphery"
	name=CJSW default=5.0E-10;
      double bulkJctSideGradingCoeff
	"Source/drain sw junction capacitance grading coefficient"
	name=MJSW default=0.33;
      double kf "Flicker noise coefficient"
	name=KF default=0.0;
      double af "Flicker noise exponent"
	name=AF default=1.0;

  from mos_base
      no is???
      double jctSatCurDensity 
	"Source/drain junction reverse saturation current density"
	name=JS default=1.0E-4;
      double sheetResistance "Source-drain sheet resistance" 
	name=RSH default=0.0;
      no rd???
      no rs???
      no cbd???
      no cbs???
      double cgso "Gate-source overlap capacitance per width"
        "CGSO default=NA;
      double cgdo "Gate-drain overlap capacitance per width"
	name=CGDO default=NA;
      double cgbo "Gate-bulk overlap capacitance per length"
	name=CGBO default=NA;
 */
model BUILT_IN_MOS7 {
  level 7
  public_keys {
    nmos7 polarity=pN;
    pmos7 polarity=pP;
  }
  dev_type BUILT_IN_MOS;
  inherit BUILT_IN_MOS_BASE;
  independent {
    override {
      double mjsw "" final_default=.33;
      double pb "" final_default=1.0 quiet_min=0.1;
      double pbsw "" final_default=pb quiet_min=0.1;
      double cjo "" default=5.0E-4;
      double cgdo "" final_default="(((dlc != NA) && (dlc > 0.0))
	  ? dlc * cox - cgdl.nom()
	  : 0.6 * xj.nom() * cox)";
      double cgso "" final_default="(((dlc != NA) && (dlc > 0.0))
	  ? dlc * cox - cgsl.nom()
	  : 0.6 * xj.nom() * cox)";
      double cgbo "" final_default="((dwc != NA)
	  ? 2.0 * dwc  * cox
	  : 2.0 * Wint * cox)";
      /* assumes cg?? final_default is BEFORE d?c final_default */
      int cmodel "CMODEL" print_test="cmodel!=1"
	calculate="((!cmodel)?1:cmodel)";
      bool needs_isub "" calculate="(alpha0.nom()!=0.)";
      int mos_level "back-annotate for diode" name=DIODElevel 
	print_test="mos_level != LEVEL" default=LEVEL;
    }
    raw_parameters {
      int capMod "Capacitance model selector (0, 1, 2, other?)"
	name=CAPMOD default=2;
      int nqsMod "Non-quasi-static model selector (0, !0)"
	name=NQSMOD default=0;
      int mobMod "Mobility model selector (1,2,3,other?)"
	name=MOBMOD default=1;
      int noiMod "Noise model selector (not used)"
	name=NOIMOD default=1;
      int paramChk "Model parameter checking selector (not used)"
	name=PARAMCHK default=0;
      int binUnit "Bin unit selector (1, !1)"
	name=BINUNIT default=1;
      double version "parameter for model version (not used)"
	name=VERSION default=3.1;
      double tox "Gate oxide thickness in meters"
	name=TOX default=150.0e-10;
       
      double xpart "Channel charge partitioning"
	name=XPART default=0.0;

      double jctSidewallSatCurDensity 
	"Sidewall junction reverse saturation current density"
	name=JSW default=0.0;
      double mjswg 
	"Source/drain (gate side) sw junction capacitance grading coefficient"
	name=MJSWG default=NA final_default=mjsw;
      double pbswg
	"Source/drain (gate side) sw junction capacitance built in potential" 
	name=PBSWG default=NA final_default=pbsw quiet_min=0.1;
      double unitLengthGateSidewallJctCap
	"Source/drain (gate side) sidewall junction capacitance per unit width"
	name=CJSWG default=NA final_default=cjsw;
      double jctEmissionCoeff 
	"Source/drain junction emission coefficient"
	name=NJ default=1.0;
      double jctTempExponent 
	"Junction current temperature exponent"
	name=XTI default=3.0;

      double Lint "Length reduction parameter" name=LINT default=0.0;
      double Ll   "Length reduction parameter" name=LL default=0.0;
      double Lln  "Length reduction parameter" name=LLN default=1.0;
      double Lw   "Length reduction parameter" name=LW default=0.0;
      double Lwn  "Length reduction parameter" name=LWN default=1.0;
      double Lwl  "Length reduction parameter" name=LWL default=0.0;

      double Wint "Width reduction parameter" name=WINT default=0.0;
      double Wl   "Width reduction parameter" name=WL default=0.0;
      double Wln  "Width reduction parameter" name=WLN default=1.0;
      double Ww   "Width reduction parameter" name=WW default=0.0;
      double Wwn  "Width reduction parameter" name=WWN default=1.0;
      double Wwl  "Width reduction parameter" name=WWL default=0.0;

      double dwc "Delta W for C-V model"
	name=DWC default=NA final_default=Wint;
      double dlc "Delta L for C-V model"
	name=DLC default=NA final_default=Lint;

      double noia "Flicker noise parameter, oxide trap density A"
	name=NOIA default=NA final_default="(polarity==pN) ? 1e20 : 9.9e18";
      double noib "Flicker noise parameter, oxide trap density B"
	name=NOIB default=NA final_default="(polarity==pN) ? 5e4 : 2.4e3";
      double noic "Flicker noise parameter, oxide trap density C"
	name=NOIC default=NA final_default="(polarity==pN) ?-1.4e-12 :1.4e-12";
      double em "Flicker noise parameter V/m"
	name=EM default=4.1e7;
      double ef "Flicker noise frequency exponent"
	name=EF default=1.0;
    }
    calculated_parameters {
      double cox;
      double factor1 "" calculate="sqrt(tox * P_EPS_SI / P_EPS_OX)";
      double vt_at_tnom "" calculate="tnom_k * P_K_Q";
      double ni "" calculate="(1.45e10 * (tnom_k / 300.15)
	 * sqrt(tnom_k / 300.15)
	 * exp(21.5565981 - egap / (2.0 * vt_at_tnom)))";
    }
    code_pre {
      //tox = std::max(tox, 1e-20);
      cox = 3.453133e-11 / tox;
    }
    code_post {
      if (npeak.has_good_value() && npeak.nom() > 1.0e20) {
	npeak.set_nom(npeak.nom() * 1.0e-6);
      }
      if (ngate.has_good_value() && ngate.nom() > 1.0e23) {
	ngate.set_nom(ngate.nom() * 1.0e-6);
      }
    }
  }
  size_dependent {
    raw_parameters {
      double cdsc "Drain/Source and channel coupling capacitance Q/V/m^2" 
	name=CDSC default=2.4e-4;
      double cdscb "Body-bias dependence of cdsc Q/V/m^2"
	name=CDSCB default=0.0;
      double cdscd "Drain-bias dependence of cdsc Q/V/m^2"
	name=CDSCD default=0.0;
      double cit "Interface state capacitance Q/V/m^2"
	name=CIT default=0.0;
      double nfactor "Subthreshold swing Coefficient"
	name=NFACTOR default=1;
      double xj "Junction depth in meters"
	name=XJ default=.15e-6;
      double vsat "Saturation velocity at tnom m/s"
	name=VSAT default=8.0e4;
      double at "Temperature coefficient of vsat m/s"
	name=AT default=3.3e4;
      double a0 "Non-uniform depletion width effect coefficient."
	name=A0 default=1.0;
      double ags "Gate bias  coefficient of Abulk."
	name=AGS default=0.0;
      double a1 "Non-saturation effect coefficient"
	name=A1 default=0.0;
      double a2 "Non-saturation effect coefficient"
	name=A2 default=1.0;
      double keta 
	"Body-bias coefficient of non-uniform depletion width effect. 1/v"
	name=KETA default=-0.047;
      double nsub "Substrate doping concentration 1/cm3"
	name=NSUB default=6.0e16;
      double npeak "Channel doping concentration 1/cm3"
	name=NCH default=NA;
      double ngate "Poly-gate doping concentration 1/cm3"
	name=NGATE default=0.0;
      double gamma1 "Vth body coefficient"
	name=GAMMA1 default=NA;
      double gamma2 "Vth body coefficient"
	name=GAMMA2 default=NA;
      double vbx "Vth transition body Voltage"
	name=VBX default=NA;
      double vbm "Maximum body voltage"
	name=VBM default=-3.0;

      double xt "Doping depth"
	name=XT default=1.55e-7;
      double k1 "Bulk effect coefficient 1"
	name=K1 default=NA;
      double kt1 "Temperature coefficient of Vth"
	name=KT1 default=-0.11;
      double kt1l "Temperature coefficient of Vth"
	name=KT1L default=0.0;
      double kt2 "Body-coefficient of kt1"
	name=KT2 default=0.022;
      double k2 "Bulk effect coefficient 2"
	name=K2 default=NA;
      double k3 "Narrow width effect coefficient"
	name=K3 default=80.0;
      double k3b "Body effect coefficient of k3"
	name=K3B default=0.0;
      double w0 "Narrow width effect parameter"
	name=W0 default=2.5e-6;
      double nlx "Lateral non-uniform doping effect"
	name=NLX default=1.74e-7;
      double dvt0 "Short channel effect coeff. 0"
	name=DVT0 default=2.2;
      double dvt1 "Short channel effect coeff. 1"
	name=DVT1 default=0.53;
      double dvt2 "Short channel effect coeff. 2 1/v"
	name=DVT2 default=-0.032;
      double dvt0w "Narrow Width coeff. 0"
	name=DVT0W default=0.0;
      double dvt1w "Narrow Width effect coeff. 1"
	name=DVT1W default=5.3e6;
      double dvt2w "Narrow Width effect coeff. 2"
	name=DVT2W default=-0.032;
      double drout "DIBL coefficient of output resistance"
	name=DROUT default=0.56;
      double dsub "DIBL coefficient in the subthreshold region"
	name=DSUB default=NA final_default="drout";
      double vth0 "Threshold voltage"
	name=VTH0 default=NA final_default=NA;
      double ua1 "Temperature coefficient of ua m/v"
	name=UA1 default=4.31e-9;
      double ua "Linear gate dependence of mobility m/v"
	name=UA default=2.25e-9;
      double ub1 "Temperature coefficient of ub (m/V)**2"
	name=UB1 default=-7.61e-18;
      double ub "Quadratic gate dependence of mobility (m/V)**2"
	name=UB default=5.87e-19;
      double uc1 "Temperature coefficient of uc"
	name=UC1 default=NA
	final_default="((m->mobMod==3) ? -0.056 : -0.056e-9)";
      double uc "Body-bias dependence of mobility"
	name=UC default=NA 
	final_default="((m->mobMod==3) ? -0.0465 : -0.0465e-9)";
      double u0 "Low-field mobility at Tnom"
	name=U0 default=NA 
	final_default="((m->polarity == pN) ? 0.067 : 0.025)";
      double ute "Temperature coefficient of mobility"
	name=UTE default=-1.5;
      double voff "Threshold voltage offset"
	name=VOFF default=-0.08;

      double delta "Effective Vds parameter"
	name=DELTA default=0.01;
      double rdsw  "Source-drain resistance per width"
	name=RDSW default=0.0;
      double prwg "Gate-bias effect on parasitic resistance"
	name=PRWG default=0.0;
      double prwb "Body-effect on parasitic resistance"
	name=PRWB default=0.0;
      double prt "Temperature coefficient of parasitic resistance"
	name=PRT default=0.0;
      double eta0 "Subthreshold region DIBL coefficient"
	name=ETA0 default=0.08;
      double etab "Subthreshold region DIBL coefficient 1/v"
	name=ETAB default=-0.07;
      double pclm "Channel length modulation Coefficient"
	name=PCLM default=1.3;
      double pdibl1 "Drain-induced barrier lowering coefficient"
	name=PDIBLC1 default=.39;
      double pdibl2 "Drain-induced barrier lowering coefficient"
	name=PDIBLC2 default=0.0086;
      double pdiblb "Body-effect on drain-induced barrier lowering 1/v" 
	name=PDIBLCB default=0.0;
      double pscbe1 "Substrate current body-effect coefficient"
	name=PSCBE1 default=4.24e8;
      double pscbe2 "Substrate current body-effect coefficient"
	name=PSCBE2 default=1.0e-5;
      double pvag "Gate dependence of output resistance parameter" 
	name=PVAG default=0.0;

      double wr "Width dependence of rds"
	name=WR default=1.0;
      double dwg "Width reduction parameter"
	name=DWG default=0.0;
      double dwb "Width reduction parameter"
	name=DWB default=0.0;
      double b0 "Abulk narrow width parameter"
	name=B0 default=0.0;
      double b1 "Abulk narrow width parameter"
	name=B1 default=0.0;

      double alpha0 "substrate current model parameter"
	name=ALPHA0 default=0.0;
      double beta0 "substrate current model parameter"
	name=BETA0 default=30.0;

      /* CV model */
      double elm "Non-quasi-static Elmore Constant Parameter"
	name=ELM default=5.0;
      double vfbcv "Flat Band Voltage parameter for capmod=0 only"
	name=VFBCV default=-1.0;
      double cgsl "New C-V model parameter"
	name=CGSL default=0.0;
      double cgdl "New C-V model parameter"
	name=CGDL default=0.0;
      double ckappa "New C-V model parameter"
	name=CKAPPA default=0.6;
      double cf "Fringe capacitance parameter"
	name=CF default=NA 
	final_default="2.0 * P_EPS_OX / M_PI * log(1.0 + 0.4e-6 / m->tox)";
      double clc "Vdsat parameter for C-V model"
	name=CLC default=0.1e-6;
      double cle "Vdsat parameter for C-V model"
	name=CLE default=0.6;
    }
    calculated_parameters {
      double dl;
      double dlc;
      double dw;
      double dwc;

      double leff; /* BUG:: why not reuse from super */
      double weff;
      double leffCV;
      double weffCV;
      
      double abulkCVfactor "" calculate="1.0 + pow((clc / leff), cle)";

      double cgso "" calculate="(m->cgso + cf) * weffCV";
      double cgdo "" calculate="(m->cgdo + cf) * weffCV";
      double cgbo "" calculate="m->cgbo * leffCV";

      double litl "" calculate="sqrt(3.0 * xj * m->tox)";
    }
    code_pre {
      {
	double T0 = pow(c->l_in, m->Lln);
	double T1 = pow(c->w_in, m->Lwn);
	double tmp1 = m->Ll / T0 + m->Lw / T1 + m->Lwl / (T0 * T1);
	dl = m->Lint + tmp1;
	dlc = m->dlc + tmp1;
      }
      {
	double T2 = pow(c->l_in, m->Wln);
	double T3 = pow(c->w_in, m->Wwn);
	double tmp2 = m->Wl / T2 + m->Ww / T3 + m->Wwl / (T2 * T3);
	dw = m->Wint + tmp2;
	dwc = m->dwc + tmp2;
      }

      leff = c->l_in - 2.0 * dl;
      weff = c->w_in - 2.0 * dw;
      leffCV = c->l_in - 2.0 * dlc;
      weffCV = c->w_in - 2.0 * dwc;
      cgate = m->cox * w_eff * l_eff; /* BUG:: not adjusted values?? */
      double L = leff;
      double W = weff;
      if (m->binUnit == 1) {
	L /= MICRON2METER;
	W /= MICRON2METER;
      }
    }
    code_post {
      if (u0 > 1.0) {
	u0 /= 1.0e4;
      }
      if (m->npeak.nom() == NA) {
	if (m->gamma1.nom() != NA) {
	  double T0 = gamma1 * m->cox;
	  npeak = 3.021E22 * T0 * T0;
	}else{
	  npeak = 1.7e17;
	}
      }
      if (m->k1.nom() != NA && m->k2.nom() != NA) {
	if (m->k1.nom() == NA) {
	  k1 = 0.53;
	}
	if (m->k2.nom() == NA) {
	  k2 = -0.0186;
	}
      }else{
	vbm = -std::abs(vbm);
	if (m->gamma1.nom() == NA) {
	  gamma1 = 5.753e-12 * sqrt(npeak) / m->cox;
	}
	if (m->gamma2.nom() == NA) {
	  gamma2 = 5.753e-12 * sqrt(nsub) / m->cox;
	}
      }
    }
  }
  temperature_dependent {
    calculated_parameters {
      double temp;
      double tempratio "" calculate="temp / m->tnom_k";
      double tempratio_1 "" calculate="tempratio - 1";
      double vtm "vtm" calculate="temp * P_K_Q";
      double ua;
      double ub;
      double uc;
      double u0temp;
      double vsattemp;
      double rds0;
      double phi;
      double sqrtPhi;
      double phis3;
      double Xdep0;
      double vbi;
      double cdep0;
      double k1;
      double k2;
      double vbsc;
      double vth0;
      double vfb;
      double theta0vb0;
      double thetaRout;
    }
    code_pre {
      temp = d->_sim->_temp_c + P_CELSIUS0;
      double egap = 1.16 - 7.02e-4 * temp * temp / (temp + 1108.0);
    }
    code_post {
      double jctTempSatCurDensity;
      double jctSidewallTempSatCurDensity;
      if (temp != m->tnom_k) {
	double T0 = m->egap / m->vt_at_tnom - egap / vtm + m->jctTempExponent
	  * log(temp / m->tnom_k);
	double T1 = exp(T0 / m->jctEmissionCoeff);
	jctTempSatCurDensity = m->js * T1;
	jctSidewallTempSatCurDensity = m->jctSidewallSatCurDensity * T1;
      }else{
	jctTempSatCurDensity = m->js;
	jctSidewallTempSatCurDensity = m->jctSidewallSatCurDensity;
      }
      if (jctTempSatCurDensity < 0.0) {
	jctTempSatCurDensity = 0.0;
      }
      if (jctSidewallTempSatCurDensity < 0.0) {
	jctSidewallTempSatCurDensity = 0.0;
      }
      {
	double T0 = (tempratio - 1.0);
	ua = s->ua + s->ua1 * T0;
	ub = s->ub + s->ub1 * T0;
	uc = s->uc + s->uc1 * T0;
	u0temp = s->u0 * pow(tempratio, s->ute); 
	vsattemp = s->vsat - s->at * T0;
	rds0 = (s->rdsw + s->prt * T0) / pow(s->weff * 1E6, s->wr);
      }
      phi = 2.0 * m->vt_at_tnom * log(s->npeak / m->ni);
      sqrtPhi = sqrt(phi);
      phis3 = sqrtPhi * phi;
      Xdep0 = sqrt(2.0 * P_EPS_SI / (P_Q * s->npeak * 1.0e6)) * sqrtPhi;
      vbi = m->vt_at_tnom * log(1.0e20 * s->npeak / (m->ni * m->ni));
      cdep0 = sqrt(P_Q * P_EPS_SI * s->npeak * 1.0e6 / 2.0 / phi);

      if (m->k1.nom() != NA && m->k2.nom() != NA) {
	k2 = s->k2;
	k1 = s->k1;
      }else{
	double vbx = (m->vbx.nom() == NA)
	  ? -std::abs(phi - 7.7348e-4 * s->npeak * s->xt * s->xt)
	  : -std::abs(s->vbx);
	double T0 = s->gamma1 - s->gamma2;
	double T1 = sqrt(phi - vbx) - sqrtPhi;
	double T2 = sqrt(phi * (phi - s->vbm)) - phi;
	k2 = T0 * T1 / (2.0 * T2 + s->vbm);
	k1 = s->gamma2 - 2.0 * k2 * sqrt(phi - s->vbm);
      }
      if (k2 < 0.) {
	double T0 = 0.5 * k1 / k2;
	vbsc = to_range(-30.0, (0.9 * (phi - T0 * T0)), -3.0);
      }else{
	vbsc = -30.0;
      }
      vbsc = std::min(vbsc, s->vbm);
      if (s->vth0 == NA) {
	vfb = -1.0;
	vth0 = m->polarity * (vfb + phi + k1 * sqrtPhi);
      }else{
	vth0 = s->vth0;
	vfb = m->polarity * vth0 - phi - k1 * sqrtPhi;
      }
      trace3("", s->vth0, vth0, vfb);
      {
	double T1 = sqrt(P_EPS_SI / P_EPS_OX * m->tox * Xdep0);
	double T0 = exp(-0.5 * s->dsub * s->leff / T1);
	theta0vb0 = (T0 + 2.0 * T0 * T0);

	T0 = exp(-0.5 * s->drout * s->leff / T1);
	double T2 = (T0 + 2.0 * T0 * T0);
	thetaRout = s->pdibl1 * T2 + s->pdibl2;
      }
    }
  }
  /*-----------------------------------------------------------------------*/
  tr_eval {
    trace3("", d->vds, d->vgs, d->vbs);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    const double EXP_THRESHOLD = 34.0;
    const double MIN_EXP = 1.713908431e-15;
    const double MAX_EXP = 5.834617425e14;
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    d->reverse_if_needed();
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Vbseff, dVbseff_dVb;
    {
      double T0 = d->vbs - t->vbsc - 0.001;
      double T1 = sqrt(T0 * T0 - 0.004 * t->vbsc);
      trace3("", t->vbsc, T0, T1);
      Vbseff = t->vbsc + 0.5 * (T0 + T1);
      dVbseff_dVb = 0.5 * (1.0 + T0 / T1);
      trace2("raw", Vbseff, dVbseff_dVb);

      fixzero(&Vbseff, t->vbsc);
      if (Vbseff < d->vbs) {	// From Spice, to fix numeric problems
	untested();		// inadequately.  Above fixzero should do a 
	Vbseff = d->vbs;	// better job, but I left this in case.
      }
    }
    trace2("fixed", Vbseff, dVbseff_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Phis, dPhis_dVb, sqrtPhis, dsqrtPhis_dVb;
    if (Vbseff > 0.0) {
      untested();
      d->sbfwd = true;
      double T0 = t->phi / (t->phi + Vbseff);
      Phis = t->phi * T0;
      dPhis_dVb = -T0 * T0;
      sqrtPhis = t->phis3 / (t->phi + 0.5 * Vbseff);
      dsqrtPhis_dVb = -0.5 * sqrtPhis * sqrtPhis / t->phis3;
      trace0("bs-fwd-bias");
    }else{
      d->sbfwd = false;
      Phis = t->phi - Vbseff;
      dPhis_dVb = -1.0;
      sqrtPhis = sqrt(Phis);
      dsqrtPhis_dVb = -0.5 / sqrtPhis;
      trace0("bs-normal");
    }
    trace4("", Phis, dPhis_dVb, sqrtPhis, dsqrtPhis_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Xdep = t->Xdep0 * sqrtPhis / t->sqrtPhi;
    double dXdep_dVb = (t->Xdep0 / t->sqrtPhi) * dsqrtPhis_dVb;
    trace2("", Xdep, dXdep_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Theta0, dTheta0_dVb;
    {
      double lt1, dlt1_dVb;
      {
	double T3 = sqrt(Xdep);
	double T0 = s->dvt2 * Vbseff;
	double T1, T2;
	if (T0 >= - 0.5) {
	  T1 = 1.0 + T0;
	  T2 = s->dvt2;
	  trace4("", T0, T1, T2, T3);
	}else{
	  untested();
	  /* Added to avoid any discontinuity problems caused by dvt2 */ 
	  double T4 = 1.0 / (3.0 + 8.0 * T0);
	  T1 = (1.0 + 3.0 * T0) * T4; 
	  T2 = s->dvt2 * T4 * T4;
	  trace4("dvd2 fix", T0, T1, T2, T3);
	}
	lt1 = m->factor1 * T3 * T1;
	dlt1_dVb = m->factor1 * (0.5 / T3 * T1 * dXdep_dVb + T3 * T2);
      }
      trace2("", lt1, dlt1_dVb);

      double T0 = -0.5 * s->dvt1 * s->leff / lt1;
      if (T0 > -EXP_THRESHOLD) {
	double T1 = exp(T0);
	Theta0 = T1 * (1.0 + 2.0 * T1);
	double dT1_dVb = -T0 / lt1 * T1 * dlt1_dVb;
	dTheta0_dVb = (1.0 + 4.0 * T1) * dT1_dVb;
	trace2("T0 > -ET", Theta0, dTheta0_dVb);
      }else{
	double T1 = MIN_EXP;
	Theta0 = T1 * (1.0 + 2.0 * T1);
	dTheta0_dVb = 0.0;
	trace2("T0 < -ET", Theta0, dTheta0_dVb);
      }
    }
    trace2("", Theta0, dTheta0_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double dVth_dVb, dVth_dVd; // d->von
    {
      double V0 = t->vbi - t->phi;
      double T2, dT2_dVb;
      {
	double ltw, dltw_dVb;
	{
	  double t3 = sqrt(Xdep);
	  double t0 = s->dvt2w * Vbseff;
	  double t1, t2;
	  if (t0 >= - 0.5) {
	    t1 = 1.0 + t0;
	    t2 = s->dvt2w;
	  }else{
	    untested();
	    /* Added to avoid any discontinuity problems caused by dvt2w */ 
	    double t4 = 1.0 / (3.0 + 8.0 * t0);
	    t1 = (1.0 + 3.0 * t0) * t4; 
	    t2 = s->dvt2w * t4 * t4;
	  }
	  trace4("", t0, t1, t2, t3);
	  ltw = m->factor1 * t3 * t1;
	  dltw_dVb = m->factor1 * (0.5 / t3 * t1 * dXdep_dVb + t3 * t2);
	}
	trace2("", ltw, dltw_dVb);
	double T0 = -0.5 * s->dvt1w * s->weff * s->leff / ltw;
	if (T0 > -EXP_THRESHOLD) {
	  double T1 = exp(T0);
	  T2 = T1 * (1.0 + 2.0 * T1);
	  double dT1_dVb = -T0 / ltw * T1 * dltw_dVb;
	  dT2_dVb = (1.0 + 4.0 * T1) * dT1_dVb;
	}else{
	  double T1 = MIN_EXP;
	  T2 = T1 * (1.0 + 2.0 * T1);
	  dT2_dVb = 0.0;
	}
	T0 = s->dvt0w * T2;
	T2 = T0 * V0;
	dT2_dVb = s->dvt0w * dT2_dVb * V0;
      }
      trace3("", V0, T2, dT2_dVb);
      double T0 = sqrt(1.0 + s->nlx / s->leff);
      double T1 = t->k1 * (T0 - 1.0) * t->sqrtPhi
	+ (s->kt1 + s->kt1l / s->leff + s->kt2 * Vbseff) * t->tempratio_1;
      double tmp2 = m->tox * t->phi / (s->weff + s->w0);
      
      double T3 = s->eta0 + s->etab * Vbseff;
      trace4("", T0, T1, tmp2, T3);
      double T4;
      if (T3 < 1.0e-4) {
	untested();
	/* avoid  discontinuity problems caused by etab */ 
	double T9 = 1.0 / (3.0 - 2.0e4 * T3);
	T3 = (2.0e-4 - T3) * T9;
	T4 = T9 * T9;
	trace3("", T9, T3, T4);
      }else{
	T4 = 1.0;
	trace1("", T4);
      }
      double thetavth = s->dvt0 * Theta0;
      double Delt_vth = thetavth * V0;
      double dDelt_vth_dVb = s->dvt0 * dTheta0_dVb * V0;
      trace4("", thetavth, t->theta0vb0, Delt_vth, dDelt_vth_dVb);
      double dDIBL_Sft_dVd = T3 * t->theta0vb0;
      double DIBL_Sft = dDIBL_Sft_dVd * d->vds;
      trace2("", dDIBL_Sft_dVd, DIBL_Sft);
      
      trace4("", t->vth0, t->k1, sqrtPhis, t->sqrtPhi);
      trace4("", t->k2, Vbseff, Delt_vth, T2);
      trace4("", s->k3, s->k3b, Vbseff, tmp2);
      trace2("", T1, DIBL_Sft);
      double Vth = m->polarity * t->vth0 + t->k1 * (sqrtPhis - t->sqrtPhi) 
	- t->k2 * Vbseff - Delt_vth - T2 + (s->k3 + s->k3b * Vbseff) * tmp2
	+ T1 - DIBL_Sft;
      d->von = Vth;
      
      dVth_dVb = t->k1 * dsqrtPhis_dVb - t->k2 - dDelt_vth_dVb - dT2_dVb
	+ s->k3b * tmp2 - s->etab * d->vds * t->theta0vb0 * T4
	+ s->kt2 * t->tempratio_1;
      dVth_dVd = -dDIBL_Sft_dVd; 
    }
    trace3("", d->von, dVth_dVb, dVth_dVd);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Calculate n */
    double n, dn_dVb, dn_dVd;
    {
      double tmp2 = s->nfactor * P_EPS_SI / Xdep;
      double tmp3 = s->cdsc + s->cdscb * Vbseff + s->cdscd * d->vds;
      double tmp4 = (tmp2 + tmp3 * Theta0 + s->cit) / m->cox;
      trace3("", tmp2, tmp3, tmp4);
      if (tmp4 >= -0.5) {
	n = 1.0 + tmp4;
	dn_dVb = (-tmp2 / Xdep * dXdep_dVb + tmp3 * dTheta0_dVb 
		  + s->cdscb * Theta0) / m->cox;
	dn_dVd = s->cdscd * Theta0 / m->cox;
	trace3("n", n, dn_dVb, dn_dVd);
      }else{
	/* avoid  discontinuity problems caused by tmp4 */ 
	double T0 = 1.0 / (3.0 + 8.0 * tmp4);
	n = (1.0 + 3.0 * tmp4) * T0;
	T0 *= T0;
	dn_dVb = (-tmp2 / Xdep * dXdep_dVb + tmp3 * dTheta0_dVb
		  + s->cdscb * Theta0) / m->cox * T0;
	dn_dVd = s->cdscd * Theta0 / m->cox * T0;
	trace3("n disc", n, dn_dVb, dn_dVd);
      }
    }
    trace3("", n, dn_dVb, dn_dVd);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Poly Gate Si Depletion Effect */
    double Vgs_eff, dVgs_eff_dVg;
    {
      double T0 = t->vfb + t->phi;
      trace2("Poly", t->vfb, t->phi);
      trace3("", s->ngate, d->vgs, T0);
      if ((s->ngate > 1.e18) && (s->ngate < 1.e25) && (d->vgs > T0)) {
	/* added to avoid the problem caused by ngate */
	double T1 = 1.0e6 * P_Q * P_EPS_SI * s->ngate / (m->cox * m->cox);
	double T4 = sqrt(1.0 + 2.0 * (d->vgs - T0) / T1);
	double T2 = T1 * (T4 - 1.0);
	double T3 = 0.5 * T2 * T2 / T1; /* T3 = Vpoly */
	double T7 = 1.12 - T3 - 0.05;
	double T6 = sqrt(T7 * T7 + 0.224);
	double T5 = 1.12 - 0.5 * (T7 + T6);
	Vgs_eff = d->vgs - T5;
	dVgs_eff_dVg = 1.0 - (0.5 - 0.5 / T4) * (1.0 + T7 / T6);
	trace2("><", Vgs_eff, dVgs_eff_dVg);
      }else{
	Vgs_eff = d->vgs;
	dVgs_eff_dVg = 1.0;
	trace2("const", Vgs_eff, dVgs_eff_dVg);
      }
    }
    trace2("", Vgs_eff, dVgs_eff_dVg);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Effective Vgst (Vgsteff) Calculation */
    double /*Vgsteff,*/ dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb, Vgst2Vtm;
    double VgstNVt, ExpVgst; // d->vgst
    {
      double Vgst = Vgs_eff - d->von;
      double T10 = 2.0 * n * t->vtm;
      VgstNVt = Vgst / T10;
      double ExpArg = (2.0 * s->voff - Vgst) / T10;
      trace4("", Vgst, T10, VgstNVt, ExpArg);

      /* MCJ: Very small Vgst */
      if (VgstNVt > EXP_THRESHOLD) {
	d->vgst = Vgst;
	dVgsteff_dVg = dVgs_eff_dVg;
	dVgsteff_dVd = -dVth_dVd;
	dVgsteff_dVb = -dVth_dVb;
	ExpVgst = NOT_VALID;
	trace4(">>", d->vgst, dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb);
      }else if (ExpArg > EXP_THRESHOLD) {
	double T0 = (Vgst - s->voff) / (n * t->vtm);
	ExpVgst = exp(T0);
	d->vgst = t->vtm * t->cdep0 / m->cox * ExpVgst;
	dVgsteff_dVg = d->vgst / (n * t->vtm);
	dVgsteff_dVd = -dVgsteff_dVg * (dVth_dVd + T0 * t->vtm * dn_dVd);
	dVgsteff_dVb = -dVgsteff_dVg * (dVth_dVb + T0 * t->vtm * dn_dVb);
	dVgsteff_dVg *= dVgs_eff_dVg;
	trace4(">", d->vgst, dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb);
      }else{
	ExpVgst = exp(VgstNVt);
	double T1 = T10 * log(1.0 + ExpVgst);
	double dT1_dVg = ExpVgst / (1.0 + ExpVgst);
	double dT1_dVb = -dT1_dVg * (dVth_dVb + Vgst / n * dn_dVb)
		      + T1 / n * dn_dVb; 
	double dT1_dVd = -dT1_dVg * (dVth_dVd + Vgst / n * dn_dVd)
		      + T1 / n * dn_dVd;

	double dT2_dVg = -m->cox / (t->vtm * t->cdep0)
		      * exp(ExpArg);
	double T2 = 1.0 - T10 * dT2_dVg;
	double dT2_dVd = -dT2_dVg * (dVth_dVd - 2.0 * t->vtm * ExpArg * dn_dVd)
		      + (T2 - 1.0) / n * dn_dVd;
	double dT2_dVb = -dT2_dVg * (dVth_dVb - 2.0 * t->vtm * ExpArg * dn_dVb)
		      + (T2 - 1.0) / n * dn_dVb;

	d->vgst = T1 / T2;
	double T3 = T2 * T2;
	dVgsteff_dVg = (T2 * dT1_dVg - T1 * dT2_dVg) / T3 * dVgs_eff_dVg;
	dVgsteff_dVd = (T2 * dT1_dVd - T1 * dT2_dVd) / T3;
	dVgsteff_dVb = (T2 * dT1_dVb - T1 * dT2_dVb) / T3;
	trace4("<", d->vgst, dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb);
      }
      Vgst2Vtm = d->vgst + 2.0 * t->vtm;
      trace3("", d->vgst, t->vtm, Vgst2Vtm);
    }
    trace1("", d->vgst);
    trace4("", dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb, Vgst2Vtm);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Calculate Effective Channel Geometry */
    double Weff, dWeff_dVg, dWeff_dVb;
    {
      double T9 = sqrtPhis - t->sqrtPhi;
      Weff = s->weff - 2.0 * (s->dwg * d->vgst + s->dwb * T9); 
      dWeff_dVg = -2.0 * s->dwg;
      dWeff_dVb = -2.0 * s->dwb * dsqrtPhis_dVb;

      if (Weff < 2.0e-8) {
	/* to avoid the discontinuity problem due to Weff*/
	double T0 = 1.0 / (6.0e-8 - 2.0 * Weff);
	Weff = 2.0e-8 * (4.0e-8 - Weff) * T0;
	T0 *= T0 * 4.0e-16;
	dWeff_dVg *= T0;
	dWeff_dVb *= T0;
	trace3("Weff fix", Weff, dWeff_dVg, dWeff_dVb);
      }
    }
    trace3("", Weff, dWeff_dVg, dWeff_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Rds, dRds_dVg, dRds_dVb;
    {
      double T9 = sqrtPhis - t->sqrtPhi;
      double T0 = s->prwg * d->vgst + s->prwb * T9;
      if (T0 >= -0.9) {
	Rds = t->rds0 * (1.0 + T0);
	dRds_dVg = t->rds0 * s->prwg;
	dRds_dVb = t->rds0 * s->prwb * dsqrtPhis_dVb;
      }else{
	/* to avoid the discontinuity problem due to prwg and prwb*/
	double T1 = 1.0 / (17.0 + 20.0 * T0);
	Rds = t->rds0 * (0.8 + T0) * T1;
	T1 *= T1;
	dRds_dVg = t->rds0 * s->prwg * T1;
	dRds_dVb = t->rds0 * s->prwb * dsqrtPhis_dVb * T1;
	trace3("Rds fix", T9, T0, T1);
	trace3("Rds fix", Rds, dRds_dVg, dRds_dVb);
      }
    }
    trace3("", Rds, dRds_dVg, dRds_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Calculate Abulk */
    double Abulk0, dAbulk0_dVb, dAbulk_dVg, Abulk, dAbulk_dVb;
    {
      double T1 = 0.5 * t->k1 / sqrtPhis;
      double dT1_dVb = -T1 / sqrtPhis * dsqrtPhis_dVb;

      double T9 = sqrt(s->xj * Xdep);
      double tmp1 = s->leff + 2.0 * T9;
      double T5 = s->leff / tmp1; 
      double tmp2 = s->a0 * T5;
      double tmp3 = s->weff + s->b1; 
      double tmp4 = s->b0 / tmp3;
      double T2 = tmp2 + tmp4;
      double dT2_dVb = -T9 / tmp1 / Xdep * dXdep_dVb;
      double T6 = T5 * T5;
      double T7 = T5 * T6;

      Abulk0 = 1.0 + T1 * T2; 
      dAbulk0_dVb = T1 * tmp2 * dT2_dVb + T2 * dT1_dVb;

      double T8 = s->ags * s->a0 * T7;
      dAbulk_dVg = -T1 * T8;
      Abulk = Abulk0 + dAbulk_dVg * d->vgst; 
      dAbulk_dVb = dAbulk0_dVb - T8 * d->vgst * (dT1_dVb + 3.0 * T1 * dT2_dVb);

      trace2("1", Abulk0, dAbulk0_dVb);
      trace3("1", dAbulk_dVg, Abulk, dAbulk_dVb);

      if (Abulk0 < 0.1) {
	/* added to avoid the problems caused by Abulk0 */
	double t9 = 1.0 / (3.0 - 20.0 * Abulk0);
	Abulk0 = (0.2 - Abulk0) * t9;
	dAbulk0_dVb *= t9 * t9;
	trace2("2", Abulk0, dAbulk0_dVb);
      }
      if (Abulk < 0.1) {
	/* added to avoid the problems caused by Abulk */
	double t9 = 1.0 / (3.0 - 20.0 * Abulk);
	Abulk = (0.2 - Abulk) * t9;
	dAbulk_dVb *= t9 * t9;
	trace3("2", dAbulk_dVg, Abulk, dAbulk_dVb);
      }

      double T0, dT0_dVb;
      {
	double t2 = s->keta * Vbseff;
	if (t2 >= -0.9) {
	  T0 = 1.0 / (1.0 + t2);
	  dT0_dVb = -s->keta * T0 * T0;
	  trace3("", t2, T0, dT0_dVb);
	}else{
	  /* added to avoid the problems caused by Keta */
	  double t1 = 1.0 / (0.8 + T2);
	  T0 = (17.0 + 20.0 * T2) * t1;
	  dT0_dVb = -s->keta * t1 * t1;
	  trace3("keta fix", T2, T0, dT0_dVb);
	}
      }
      dAbulk_dVg *= T0;
      dAbulk_dVb = dAbulk_dVb * T0 + Abulk * dT0_dVb;
      dAbulk0_dVb = dAbulk0_dVb * T0 + Abulk0 * dT0_dVb;
      Abulk *= T0;
      Abulk0 *= T0;
    }
    trace2("", Abulk0, dAbulk0_dVb);
    trace3("", dAbulk_dVg, Abulk, dAbulk_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Mobility calculation */
    double ueff, dueff_dVg, dueff_dVd, dueff_dVb;
    {
      double Denomi, dDenomi_dVg, dDenomi_dVd, dDenomi_dVb;
      {
	double T5;
	if (m->mobMod == 1) {
	  double T0 = d->vgst + d->von + d->von;
	  double T2 = t->ua + t->uc * Vbseff;
	  double T3 = T0 / m->tox;
	  T5 = T3 * (T2 + t->ub * T3);
	  dDenomi_dVg = (T2 + 2.0 * t->ub * T3) / m->tox;
	  dDenomi_dVd = dDenomi_dVg * 2.0 * dVth_dVd;
	  dDenomi_dVb = dDenomi_dVg * 2.0 * dVth_dVb + t->uc * T3;
	}else if (m->mobMod == 2) {
	  T5 = d->vgst / m->tox 
	    * (t->ua + t->uc * Vbseff + t->ub * d->vgst / m->tox);
	  dDenomi_dVg = (t->ua + t->uc * Vbseff + 2.0 * t->ub * d->vgst / m->tox)
	    / m->tox;
	  dDenomi_dVd = 0.0;
	  dDenomi_dVb = d->vgst * t->uc / m->tox; 
	}else{
	  double T0 = d->vgst + d->von + d->von;
	  double T2 = 1.0 + t->uc * Vbseff;
	  double T3 = T0 / m->tox;
	  double T4 = T3 * (t->ua + t->ub * T3);
	  T5 = T4 * T2;
	  dDenomi_dVg = (t->ua + 2.0 * t->ub * T3) * T2 / m->tox;
	  dDenomi_dVd = dDenomi_dVg * 2.0 * dVth_dVd;
	  dDenomi_dVb = dDenomi_dVg * 2.0 * dVth_dVb + t->uc * T4;
	}
	if (T5 >= -0.8) {
	  Denomi = 1.0 + T5;
	}else{
	  /* Added to avoid the discontinuity problem caused by ua and ub*/ 
	  double t9 = 1.0 / (7.0 + 10.0 * T5);
	  Denomi = (0.6 + T5) * t9;
	  t9 *= t9;
	  dDenomi_dVg *= t9;
	  dDenomi_dVd *= t9;
	  dDenomi_dVb *= t9;
	}
      }
      ueff = t->u0temp / Denomi;
      double t9 = -ueff / Denomi;
      dueff_dVg = t9 * dDenomi_dVg;
      dueff_dVd = t9 * dDenomi_dVd;
      dueff_dVb = t9 * dDenomi_dVb;
    }
    trace4("", ueff, dueff_dVg, dueff_dVd, dueff_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Esat, EsatL, dEsatL_dVg, dEsatL_dVd, dEsatL_dVb;
    {
      Esat = 2.0 * t->vsattemp / ueff;
      EsatL = Esat * s->leff;
      double T0 = -EsatL /ueff;
      dEsatL_dVg = T0 * dueff_dVg;
      dEsatL_dVd = T0 * dueff_dVd;
      dEsatL_dVb = T0 * dueff_dVb;
    }
    trace2("", Esat, EsatL);
    trace3("", dEsatL_dVg, dEsatL_dVd, dEsatL_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    double Vdsat, dVdsat_dVg, dVdsat_dVd, dVdsat_dVb; // d->vdsat
    double Vasat, dVasat_dVg, dVasat_dVb, dVasat_dVd;
    {
      double WVCoxRds;
      {
	double WVCox = Weff * t->vsattemp * m->cox;
	WVCoxRds = WVCox * Rds;
      }
      trace1("", WVCoxRds);

      double Lambda, dLambda_dVg;
      {
	if (s->a1 == 0.0) {
	  Lambda = s->a2;
	  dLambda_dVg = 0.0;
	}else if (s->a1 > 0.0) {
	  /* avoid discontinuity problem caused by s->a1 and s->a2 (Lambda) */
	  double T0 = 1.0 - s->a2;
	  double T1 = T0 - s->a1 * d->vgst - 0.0001;
	  double T2 = sqrt(T1 * T1 + 0.0004 * T0);
	  Lambda = s->a2 + T0 - 0.5 * (T1 + T2);
	  dLambda_dVg = 0.5 * s->a1 * (1.0 + T1 / T2);
	}else{
	  double T1 = s->a2 + s->a1 * d->vgst - 0.0001;
	  double T2 = sqrt(T1 * T1 + 0.0004 * s->a2);
	  Lambda = 0.5 * (T1 + T2);
	  dLambda_dVg = 0.5 * s->a1 * (1.0 + T1 / T2);
	}
      }
      trace2("", Lambda, dLambda_dVg);

      double tmp2, tmp3;
      if (Rds > 0) {
	tmp2 = dRds_dVg / Rds + dWeff_dVg / Weff;
	tmp3 = dRds_dVb / Rds + dWeff_dVb / Weff;
      }else{
	tmp2 = dWeff_dVg / Weff;
	tmp3 = dWeff_dVb / Weff;
      }
      trace2("", tmp2, tmp3);

      //double Vdsat, dVdsat_dVg, dVdsat_dVd, dVdsat_dVb; // d->vdsat
      double tmp1;
      {
	if ((Rds == 0.0) && (Lambda == 1.0)) {
	  double T0 = 1.0 / (Abulk * EsatL + Vgst2Vtm);
	  tmp1 = 0.0;
	  double T1 = T0 * T0;
	  double T2 = Vgst2Vtm * T0;
	  double T3 = EsatL * Vgst2Vtm;
	  Vdsat = T3 * T0;
	  double dT0_dVg = -(Abulk * dEsatL_dVg + EsatL * dAbulk_dVg + 1.0)*T1;
	  double dT0_dVd = -(Abulk * dEsatL_dVd) * T1; 
	  double dT0_dVb = -(Abulk * dEsatL_dVb + dAbulk_dVb * EsatL) * T1;   
	  dVdsat_dVg = T3 * dT0_dVg + T2 * dEsatL_dVg + EsatL * T0;
	  dVdsat_dVd = T3 * dT0_dVd + T2 * dEsatL_dVd;
	  dVdsat_dVb = T3 * dT0_dVb + T2 * dEsatL_dVb;   
	}else{
	  tmp1 = dLambda_dVg / (Lambda * Lambda);
	  double T9 = Abulk * WVCoxRds;
	  double T8 = Abulk * T9;
	  double T7 = Vgst2Vtm * T9;
	  double T6 = Vgst2Vtm * WVCoxRds;
	  double T0 = 2.0 * Abulk * (T9 - 1.0 + 1.0 / Lambda); 
	  double dT0_dVg = 2.0 * (T8 * tmp2 - Abulk * tmp1
			+ (2.0 * T9 + 1.0 / Lambda - 1.0) * dAbulk_dVg);
	  double dT0_dVb = 2.0 * (T8 * (2.0 / Abulk * dAbulk_dVb + tmp3)
				  + (1.0 / Lambda - 1.0) * dAbulk_dVb);
	  //double dT0_dVd = 0.0;
	  
	  double T1 = Vgst2Vtm * (2.0 / Lambda - 1.0) + Abulk * EsatL + 3.0*T7;
	  double dT1_dVg = (2.0 / Lambda - 1.0) - 2.0 * Vgst2Vtm * tmp1
	    + Abulk * dEsatL_dVg + EsatL * dAbulk_dVg 
	    + 3.0 * (T9 + T7 * tmp2 + T6 * dAbulk_dVg);
	  double dT1_dVb = Abulk * dEsatL_dVb + EsatL * dAbulk_dVb
	    + 3.0 * (T6 * dAbulk_dVb + T7 * tmp3);
	  double dT1_dVd = Abulk * dEsatL_dVd;
	  
	  double T2 = Vgst2Vtm * (EsatL + 2.0 * T6);
	  double dT2_dVg = EsatL + Vgst2Vtm * dEsatL_dVg
	    + T6 * (4.0 + 2.0 * Vgst2Vtm * tmp2);
	  double dT2_dVb = Vgst2Vtm * (dEsatL_dVb + 2.0 * T6 * tmp3);
	  double dT2_dVd = Vgst2Vtm * dEsatL_dVd;
	  
	  double T3 = sqrt(T1 * T1 - 2.0 * T0 * T2);
	  Vdsat = (T1 - T3) / T0;
	  dVdsat_dVg = (dT1_dVg - (T1 * dT1_dVg - dT0_dVg * T2
				- T0 * dT2_dVg) / T3 - Vdsat * dT0_dVg) / T0;
	  dVdsat_dVb = (dT1_dVb - (T1 * dT1_dVb - dT0_dVb * T2
				- T0 * dT2_dVb) / T3 - Vdsat * dT0_dVb) / T0;
	  dVdsat_dVd = (dT1_dVd - (T1 * dT1_dVd - T0 * dT2_dVd) / T3) / T0;
	}
	d->vdsat = Vdsat;
	d->saturated = (d->vds >= d->vdsat);
      }
      trace1("", tmp1);
      trace4("d->vdsat", Vdsat, dVdsat_dVg, dVdsat_dVd, dVdsat_dVb);

      // double Vasat, dVasat_dVg, dVasat_dVb, dVasat_dVd;
      {
	double tmp4 = 1.0 - 0.5 * Abulk * Vdsat / Vgst2Vtm;
	double T9 = WVCoxRds * d->vgst;
	double T8 = T9 / Vgst2Vtm;
	double T0 = EsatL + Vdsat + 2.0 * T9 * tmp4;
	double T7 = 2.0 * WVCoxRds * tmp4;
	double dT0_dVg = dEsatL_dVg + dVdsat_dVg + T7 * (1.0 + tmp2 * d->vgst)
	  - T8 * (Abulk * dVdsat_dVg - Abulk * Vdsat / Vgst2Vtm
		  + Vdsat * dAbulk_dVg);   
	double dT0_dVb = dEsatL_dVb + dVdsat_dVb + T7 * tmp3 * d->vgst
	  - T8 * (dAbulk_dVb * Vdsat + Abulk * dVdsat_dVb);
	double dT0_dVd = dEsatL_dVd + dVdsat_dVd - T8 * Abulk * dVdsat_dVd;
	T9 = WVCoxRds * Abulk; 
	double T1 = 2.0 / Lambda - 1.0 + T9; 
	double dT1_dVg = -2.0 * tmp1 +  WVCoxRds * (Abulk * tmp2 + dAbulk_dVg);
	double dT1_dVb = dAbulk_dVb * WVCoxRds + T9 * tmp3;
	Vasat = T0 / T1;
	dVasat_dVg = (dT0_dVg - Vasat * dT1_dVg) / T1;
	dVasat_dVb = (dT0_dVb - Vasat * dT1_dVb) / T1;
	dVasat_dVd = dT0_dVd / T1;
      }
      trace4("", Vasat, dVasat_dVg, dVasat_dVb, dVasat_dVd);
    }
    trace1("", d->vdsat);
    trace4("", Vdsat, dVdsat_dVg, dVdsat_dVd, dVdsat_dVb);
    trace4("", Vasat, dVasat_dVg, dVasat_dVb, dVasat_dVd);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Effective Vds (Vdseff) Calculation */
    double Vdseff, diffVds, dVdseff_dVg, dVdseff_dVd, dVdseff_dVb;
    {
      double T1 = Vdsat - d->vds - s->delta;
      double dT1_dVg = dVdsat_dVg;
      double dT1_dVd = dVdsat_dVd - 1.0;
      double dT1_dVb = dVdsat_dVb;
      trace4("", T1, dT1_dVg, dT1_dVd, dT1_dVb);
      
      double T2 = sqrt(T1 * T1 + 4.0 * s->delta * Vdsat);
      double T0 = T1 / T2;
      double T3 = 2.0 * s->delta / T2;
      trace3("", T2, T0, T3);
      double dT2_dVg = T0 * dT1_dVg + T3 * dVdsat_dVg;
      double dT2_dVd = T0 * dT1_dVd + T3 * dVdsat_dVd;
      double dT2_dVb = T0 * dT1_dVb + T3 * dVdsat_dVb;
      trace3("", dT2_dVg, dT2_dVd, dT2_dVb);
      
      Vdseff      = Vdsat - 0.5 * (T1 + T2);
      dVdseff_dVg = dVdsat_dVg - 0.5 * (dT1_dVg + dT2_dVg); 
      dVdseff_dVd = dVdsat_dVd - 0.5 * (dT1_dVd + dT2_dVd); 
      dVdseff_dVb = dVdsat_dVb - 0.5 * (dT1_dVb + dT2_dVb); 
      trace4("raw", Vdseff, dVdseff_dVg, dVdseff_dVd, dVdseff_dVb);

      fixzero(&Vdseff,      Vdsat);
      fixzero(&dVdseff_dVg, dVdsat_dVg);
      fixzero(&dVdseff_dVd, dVdsat_dVd);
      fixzero(&dVdseff_dVb, dVdsat_dVb);
      /* Added to eliminate non-zero Vdseff at Vds=0.0 */
      if (d->vds == 0.0) {
	assert(Vdseff == 0.0);
	assert(dVdseff_dVg == 0.0);
	assert(dVdseff_dVb == 0.0);
      }
      if (Vdseff > d->vds) {	// From Spice, to fix numeric problems.
	trace2("numeric problems", Vdseff, d->vds);
	Vdseff = d->vds;
      }
      trace4("fixed", Vdseff, dVdseff_dVg, dVdseff_dVd, dVdseff_dVb);

      diffVds = d->vds - Vdseff;
      trace2("", Vdseff, diffVds);
    }
    trace2("", Vdseff, diffVds);
    trace3("", dVdseff_dVg, dVdseff_dVd, dVdseff_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Calculate Ids */
    double Idsa, dIdsa_dVg, dIdsa_dVd, dIdsa_dVb;
    {
      double Va, dVa_dVg, dVa_dVd, dVa_dVb;
      {
	double VACLM, dVACLM_dVg, dVACLM_dVb, dVACLM_dVd;
	if ((s->pclm > 0.0) && (diffVds > 1.0e-10)) {
	  double T0 = 1.0 / (s->pclm * Abulk * s->litl);
	  double dT0_dVb = -T0 / Abulk * dAbulk_dVb;
	  double dT0_dVg = -T0 / Abulk * dAbulk_dVg; 
	  double T2 = d->vgst / EsatL;
	  double T1 = s->leff * (Abulk + T2); 
	  double dT1_dVg = s->leff * ((1.0-T2*dEsatL_dVg)/EsatL + dAbulk_dVg);
	  double dT1_dVb = s->leff * (dAbulk_dVb - T2 * dEsatL_dVb / EsatL);
	  double dT1_dVd = -T2 * dEsatL_dVd / Esat;
	  double T9 = T0 * T1;
	  VACLM = T9 * diffVds;
	  dVACLM_dVg = T0 * dT1_dVg * diffVds - T9 * dVdseff_dVg
	    + T1 * diffVds * dT0_dVg;
	  dVACLM_dVb = (dT0_dVb*T1 + T0*dT1_dVb) * diffVds - T9 * dVdseff_dVb;
	  dVACLM_dVd = T0 * dT1_dVd * diffVds + T9 * (1.0 - dVdseff_dVd);
	}else{
	  VACLM = MAX_EXP;
	  dVACLM_dVd = dVACLM_dVg = dVACLM_dVb = 0.0;
	}
	trace4("", VACLM, dVACLM_dVg, dVACLM_dVb, dVACLM_dVd);

	double VADIBL, dVADIBL_dVg, dVADIBL_dVb, dVADIBL_dVd;
	if (t->thetaRout > 0.0) {
	  double T8 = Abulk * Vdsat;
	  double T0 = Vgst2Vtm * T8;
	  double dT0_dVg = Vgst2Vtm * Abulk * dVdsat_dVg + T8
	    + Vgst2Vtm * Vdsat * dAbulk_dVg;
	  double dT0_dVb = Vgst2Vtm * (dAbulk_dVb*Vdsat + Abulk*dVdsat_dVb);
	  double dT0_dVd = Vgst2Vtm * Abulk * dVdsat_dVd;
	  double T1 = Vgst2Vtm + T8;
	  double dT1_dVg = 1.0 + Abulk * dVdsat_dVg + Vdsat * dAbulk_dVg;
	  double dT1_dVb = Abulk * dVdsat_dVb + dAbulk_dVb * Vdsat;
	  double dT1_dVd = Abulk * dVdsat_dVd;
	  double T9 = T1 * T1;
	  double T2 = t->thetaRout;
	  VADIBL = (Vgst2Vtm - T0 / T1) / T2;
	  dVADIBL_dVg = (1.0 - dT0_dVg / T1 + T0 * dT1_dVg / T9) / T2;
	  dVADIBL_dVb = (-dT0_dVb / T1 + T0 * dT1_dVb / T9) / T2;
	  dVADIBL_dVd = (-dT0_dVd / T1 + T0 * dT1_dVd / T9) / T2;
	  
	  double T7 = s->pdiblb * Vbseff;
	  if (T7 >= -0.9) {
	    double T3 = 1.0 / (1.0 + T7);
	    VADIBL *= T3;
	    dVADIBL_dVg *= T3;
	    dVADIBL_dVb = (dVADIBL_dVb - VADIBL * s->pdiblb) * T3;
	    dVADIBL_dVd *= T3;
	  }else{
	    /* Added to avoid the discontinuity problem caused by pdiblcb */
	    double T4 = 1.0 / (0.8 + T7);
	    double T3 = (17.0 + 20.0 * T7) * T4;
	    dVADIBL_dVg *= T3;
	    dVADIBL_dVb = dVADIBL_dVb * T3 - VADIBL * s->pdiblb * T4 * T4;
	    dVADIBL_dVd *= T3;
	    VADIBL *= T3;
	  }
	}else{
	  VADIBL = MAX_EXP;
	  dVADIBL_dVd = dVADIBL_dVg = dVADIBL_dVb = 0.0;
	}
	trace4("", VADIBL, dVADIBL_dVg, dVADIBL_dVb, dVADIBL_dVd);

	double T8 = s->pvag / EsatL;
	double T9 = T8 * d->vgst;
	double T0, dT0_dVg, dT0_dVb, dT0_dVd;
	if (T9 > -0.9) {
	  T0 = 1.0 + T9;
	  dT0_dVg = T8 * (1.0 - d->vgst * dEsatL_dVg / EsatL);
	  dT0_dVb = -T9 * dEsatL_dVb / EsatL;
	  dT0_dVd = -T9 * dEsatL_dVd / EsatL;
	}else{
	  /* Added to avoid the discontinuity problems caused by pvag */
	  double T1 = 1.0 / (17.0 + 20.0 * T9);
	  T0 = (0.8 + T9) * T1;
	  T1 *= T1;
	  dT0_dVg = T8 * (1.0 - d->vgst * dEsatL_dVg / EsatL) * T1;
	  T9 *= T1 / EsatL;
	  dT0_dVb = -T9 * dEsatL_dVb;
	  dT0_dVd = -T9 * dEsatL_dVd;
	}
	double tmp1 = VACLM * VACLM;
	double tmp2 = VADIBL * VADIBL;
	double tmp3 = VACLM + VADIBL;
	
	double T1 = VACLM * VADIBL / tmp3;
	tmp3 *= tmp3;
	double dT1_dVg = (tmp1 * dVADIBL_dVg + tmp2 * dVACLM_dVg) / tmp3;
	double dT1_dVd = (tmp1 * dVADIBL_dVd + tmp2 * dVACLM_dVd) / tmp3;
	double dT1_dVb = (tmp1 * dVADIBL_dVb + tmp2 * dVACLM_dVb) / tmp3;
	
	Va = Vasat + T0 * T1;
	dVa_dVg = dVasat_dVg + T1 * dT0_dVg + T0 * dT1_dVg;
	dVa_dVd = dVasat_dVd + T1 * dT0_dVd + T0 * dT1_dVd;
	dVa_dVb = dVasat_dVb + T1 * dT0_dVb + T0 * dT1_dVb;
      }
      trace4("", Va, dVa_dVg, dVa_dVd, dVa_dVb);

      double Idl, dIdl_dVg, dIdl_dVd, dIdl_dVb;
      {
	double gche, dgche_dVg, dgche_dVd, dgche_dVb;
	{
	  double beta, dbeta_dVg, dbeta_dVd, dbeta_dVb;
	  {
	    double CoxWovL = m->cox * Weff / s->leff;
	    beta = ueff * CoxWovL;
	    dbeta_dVg = CoxWovL * dueff_dVg + beta * dWeff_dVg / Weff;
	    dbeta_dVd = CoxWovL * dueff_dVd;
	    dbeta_dVb = CoxWovL * dueff_dVb + beta * dWeff_dVb / Weff;
	  }
	  trace4("", beta, dbeta_dVg, dbeta_dVd, dbeta_dVb);

	  double fgche1, dfgche1_dVg, dfgche1_dVd, dfgche1_dVb;
	  {
	    double T0 = 1.0 - 0.5 * Abulk * Vdseff / Vgst2Vtm;
	    double dT0_dVg = -0.5 * (Abulk * dVdseff_dVg 
		- Abulk * Vdseff / Vgst2Vtm + Vdseff * dAbulk_dVg) / Vgst2Vtm;
	    double dT0_dVd = -0.5 * Abulk * dVdseff_dVd / Vgst2Vtm;
	    double dT0_dVb = -0.5 * (Abulk*dVdseff_dVb + dAbulk_dVb*Vdseff) 
	      / Vgst2Vtm;
	    fgche1 = d->vgst * T0;
	    dfgche1_dVg = d->vgst * dT0_dVg + T0; 
	    dfgche1_dVd = d->vgst * dT0_dVd; 
	    dfgche1_dVb = d->vgst * dT0_dVb; 
	  }
	  trace4("", fgche1, dfgche1_dVg, dfgche1_dVd, dfgche1_dVb);

	  double fgche2, dfgche2_dVg, dfgche2_dVd, dfgche2_dVb;
	  {
	    double T9 = Vdseff / EsatL;
	    fgche2 = 1.0 + T9;
	    dfgche2_dVg = (dVdseff_dVg - T9 * dEsatL_dVg) / EsatL;
	    dfgche2_dVd = (dVdseff_dVd - T9 * dEsatL_dVd) / EsatL;
	    dfgche2_dVb = (dVdseff_dVb - T9 * dEsatL_dVb) / EsatL;
	  }
	  trace4("", fgche2, dfgche2_dVg, dfgche2_dVd, dfgche2_dVb);

	  gche = beta * fgche1 / fgche2;
	  dgche_dVg = (beta * dfgche1_dVg + fgche1 * dbeta_dVg
		       - gche * dfgche2_dVg) / fgche2;
	  dgche_dVd = (beta * dfgche1_dVd + fgche1 * dbeta_dVd
		       - gche * dfgche2_dVd) / fgche2;
	  dgche_dVb = (beta * dfgche1_dVb + fgche1 * dbeta_dVb
		       - gche * dfgche2_dVb) / fgche2;
	}
	trace4("", gche, dgche_dVg, dgche_dVd, dgche_dVb);

	double T0 = 1.0 + gche * Rds;
	double T9 = Vdseff / T0;
	Idl = gche * T9;
	dIdl_dVg = (gche * dVdseff_dVg + T9 * dgche_dVg) / T0
	  - Idl * gche / T0 * dRds_dVg; 
	dIdl_dVd = (gche * dVdseff_dVd + T9 * dgche_dVd) / T0; 
	dIdl_dVb = (gche*dVdseff_dVb + T9*dgche_dVb - Idl*dRds_dVb*gche) / T0; 
      }
      trace4("", Idl, dIdl_dVg, dIdl_dVd, dIdl_dVb);

      double T9 =  diffVds / Va;
      double T0 =  1.0 + T9;
      Idsa = Idl * T0;
      dIdsa_dVg = T0 * dIdl_dVg - Idl * (dVdseff_dVg + T9 * dVa_dVg) / Va;
      dIdsa_dVd = T0 * dIdl_dVd + Idl * (1.0 - dVdseff_dVd - T9*dVa_dVd) / Va;
      dIdsa_dVb = T0 * dIdl_dVb - Idl * (dVdseff_dVb + T9 * dVa_dVb) / Va;
    }
    trace4("", Idsa, dIdsa_dVg, dIdsa_dVd, dIdsa_dVb);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // d->ids, d->gds, d->gmf, d->gmbf
    {
      double VASCBE, dVASCBE_dVg, dVASCBE_dVd, dVASCBE_dVb;
      if (s->pscbe2 > 0.0) {
	if (diffVds > s->pscbe1 * s->litl / EXP_THRESHOLD) {
	  double T0 =  s->pscbe1 * s->litl / diffVds;
	  VASCBE = s->leff * exp(T0) / s->pscbe2;
	  double T1 = T0 * VASCBE / diffVds;
	  dVASCBE_dVg = T1 * dVdseff_dVg;
	  dVASCBE_dVd = -T1 * (1.0 - dVdseff_dVd);
	  dVASCBE_dVb = T1 * dVdseff_dVb;
	}else{
	  VASCBE = MAX_EXP * s->leff/s->pscbe2;
	  dVASCBE_dVg = dVASCBE_dVd = dVASCBE_dVb = 0.0;
	}
      }else{
	VASCBE = MAX_EXP;
	dVASCBE_dVg = dVASCBE_dVd = dVASCBE_dVb = 0.0;
      }
      double T9 = diffVds / VASCBE;
      double T0 = 1.0 + T9;
      double Ids = Idsa * T0;
      double Gm = T0*dIdsa_dVg - Idsa*(dVdseff_dVg + T9*dVASCBE_dVg) / VASCBE;
      double Gds = T0 * dIdsa_dVd 
	+ Idsa * (1.0 - dVdseff_dVd - T9 * dVASCBE_dVd) / VASCBE;
      double Gmb = T0 * dIdsa_dVb
	- Idsa * (dVdseff_dVb + T9 * dVASCBE_dVb) / VASCBE;
      trace3("", T0, dIdsa_dVb, (T0 * dIdsa_dVb));
      trace4("", dVdseff_dVb, T9, dVASCBE_dVb, (dVdseff_dVb + T9*dVASCBE_dVb));
      trace3("", Idsa, VASCBE, (Idsa*(dVdseff_dVb+T9*dVASCBE_dVb)/VASCBE));

      Gds += Gm * dVgsteff_dVd;
      Gmb += Gm * dVgsteff_dVb;
      Gm *= dVgsteff_dVg;
      Gmb *= dVbseff_dVb;
      trace4("", Ids, Gm, Gds, Gmb);
      trace0("=========================");

      d->gds = Gds;
      if (d->reversed) {
	d->ids  = -Ids;
	d->gmr  = Gm;
	d->gmbr = Gmb;
	d->gmf = d->gmbf = 0;
      }else{
	d->ids  = Ids;
	d->gmf  = Gm;
	d->gmbf = Gmb;
	d->gmr = d->gmbr = 0.;
      }
    }
    trace4("", d->ids, d->gds, d->gmf, d->gmbf);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // d->isub, d->gbbs, d->gbgs, d->gbds
    {
      /* calculate substrate current Isub */
      double Isub, Gbd, Gbb, Gbg;
      if ((s->alpha0 <= 0.0) || (s->beta0 <= 0.0)) {
	Isub = Gbd = Gbb = Gbg = 0.0;
	trace4("no-isub", Isub, Gbd, Gbb, Gbg);
      }else{
	double T2 = s->alpha0 / s->leff;
	double T1, dT1_dVg, dT1_dVd, dT1_dVb;
	if (diffVds > s->beta0 / EXP_THRESHOLD) {
	  double T0 = -s->beta0 / diffVds;
	  T1 = T2 * diffVds * exp(T0);
	  double T3 = T1 / diffVds * (T0 - 1.0);
	  trace3("", T0, T2, T3);
	  dT1_dVg = T3 * dVdseff_dVg;
	  dT1_dVd = T3 * (dVdseff_dVd - 1.0);
	  dT1_dVb = T3 * dVdseff_dVb;
	  trace4("vds > ?", T1, dT1_dVg, dT1_dVd, dT1_dVb);
	}else{
	  double T3 = T2 * MIN_EXP;
	  trace2("", T2, T3);
	  T1 = T3 * diffVds;
	  dT1_dVg = -T3 * dVdseff_dVg;
	  dT1_dVd = T3 * (1.0 - dVdseff_dVd);
	  dT1_dVb = -T3 * dVdseff_dVb;
	  trace4("vds < ?", T1, dT1_dVg, dT1_dVd, dT1_dVb);
	}
	Isub = T1 * Idsa;
	Gbg = T1 * dIdsa_dVg + Idsa * dT1_dVg;
	Gbd = T1 * dIdsa_dVd + Idsa * dT1_dVd;
	Gbb = T1 * dIdsa_dVb + Idsa * dT1_dVb;
	trace4("raw", Isub, Gbd, Gbb, Gbg);
	
	Gbd += Gbg * dVgsteff_dVd;
	Gbb += Gbg * dVgsteff_dVb;
	Gbg *= dVgsteff_dVg;
	Gbb *= dVbseff_dVb; /* bug fixing */
      }
      trace4("", Isub, Gbd, Gbb, Gbg);
      if (d->reversed) {
	d->idb   = Isub;
	d->gdbds = Gbd;
	d->gdbgs = Gbg;
	d->gdbbs = Gbb;
	d->isb = d->gsbsd = d->gsbgd = d->gsbbd = 0.;
      }else{
	d->idb = d->gdbds = d->gdbgs = d->gdbbs = 0.;
	d->isb   = Isub;
	d->gsbsd = Gbd;
	d->gsbgd = Gbg;
	d->gsbbd = Gbb;
      }
      //double d__csub = Isub - (Gbb * Vbseff + Gbd * d->vds + Gbg * d->vgs);
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    /* Calculate Qinv for Noise analysis */
    {
      //double T1 = d->vgst * (1.0 - 0.5 * Abulk * Vdseff / Vgst2Vtm);
      //double d__qinv = -m->cox * Weff * s->leff * T1;
    }
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // ends line 2020 (finished)
    // d->qgate, d->qdrn, d->qbulk
    // d->cggb, d->cgsb, d->cgdb
    // d->cdgb, d->cdsb, d->cddb
    // d->cbgb, d->cbsb, d->cbdb
    {
      const bool ChargeComputationNeeded = true;
      trace2("", m->xpart, m->capMod);
      if ((m->xpart < 0) || (!ChargeComputationNeeded)) {
	d->qgate = d->qdrn = d->qbulk = 0.0;
	d->cggb = d->cgsb = d->cgdb = 0.0;
	d->cdgb = d->cdsb = d->cddb = 0.0;
	d->cbgb = d->cbsb = d->cbdb = 0.0;
	trace0("xpart < 0 || no charge computation");
      }else if (m->capMod == 0) {
	// block ends 1710 this 1454
	trace0("begin capMod == 0 (mos7)");
	if (Vbseff < 0.0) {  // redefinition
	  Vbseff = d->vbs;
	  dVbseff_dVb = 1.0;
	}else{
	  Vbseff = t->phi - Phis;
	  dVbseff_dVb = -dPhis_dVb;
	}
	trace1("old value replaced", dVth_dVb);
	double Vfb = s->vfbcv; // possible improper redefinition later
	double Vth = Vfb + t->phi + t->k1 * sqrtPhis; 
	dVth_dVb = t->k1 * dsqrtPhis_dVb; // redefinition
	double Vgst = Vgs_eff - Vth;
	//double dVgst_dVb = -dVth_dVb;
	//double dVgst_dVg = dVgs_eff_dVg; 
	double CoxWL = m->cox * s->weffCV * s->leffCV;
	double Arg1 = Vgs_eff - Vbseff - Vfb;
	trace3("", Vfb, Vth, dVth_dVb);
	trace3("", Vgst, CoxWL, Arg1);

	// ends 1618 this 1328
	if (Arg1 <= 0.0) {
	  trace0("Arg1 <= 0.0");
	  
	  d->qgate = CoxWL * Arg1;
	  d->cggb = CoxWL * dVgs_eff_dVg;
	  d->cgdb = 0.0;
	  d->cgsb = CoxWL * (dVbseff_dVb - dVgs_eff_dVg);
	  
	  d->qbulk = -d->qgate;
	  d->cbgb = -CoxWL * dVgs_eff_dVg;
	  d->cbdb = 0.0;
	  d->cbsb = -d->cgsb;
	  
	  d->qdrn = 0.0;
	  d->cdgb = 0.0;
	  d->cddb = 0.0;
	  d->cdsb = 0.0;
	}else if (Vgst <= 0.0) {
	  trace0("Vgst <= 0.0");
	  double T1 = 0.5 * t->k1;
	  double T2 = sqrt(T1 * T1 + Arg1);
	  double T0 = CoxWL * T1 / T2;

	  d->qgate = CoxWL * t->k1 * (T2 - T1);
	  d->cggb = T0 * dVgs_eff_dVg;
	  d->cgdb = 0.0;
	  d->cgsb = T0 * (dVbseff_dVb - dVgs_eff_dVg);
	  
	  d->qbulk = -d->qgate;
	  d->cbgb = -d->cggb;
	  d->cbdb = 0.0;
	  d->cbsb = -d->cgsb;
   
	  d->qdrn = 0.0;
	  d->cdgb = 0.0;
	  d->cddb = 0.0;
	  d->cdsb = 0.0;
	}else{
	  trace0("!(Arg1 <= 0.0 || Vgst <= 0.0)");
	  double One_Third_CoxWL = CoxWL / 3.0;
	  double Two_Third_CoxWL = 2.0 * One_Third_CoxWL;
	  // redefine Vdsat, dVdsat_dVg, dVdsat_dVb
	  {
	    double AbulkCV = Abulk0 * s->abulkCVfactor;
	    double dAbulkCV_dVb = s->abulkCVfactor * dAbulk0_dVb;
	    Vdsat = Vgst / AbulkCV;
	    dVdsat_dVg = dVgs_eff_dVg / AbulkCV;
	    dVdsat_dVb = - (Vdsat * dAbulkCV_dVb + dVth_dVb)/ AbulkCV; 
	  }
	  if (m->xpart > 0.5) {
	    /* 0/100 Charge petition model */
	    if (d->vds >= Vdsat) {
	      /* saturation region */
	      double T1 = Vdsat / 3.0;
	      double T2 = -One_Third_CoxWL * dVdsat_dVb;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - T1);
	      d->cggb = One_Third_CoxWL * (3.0 - dVdsat_dVg) * dVgs_eff_dVg;
	      d->cgsb = -(d->cggb + T2);
	      d->cgdb = 0.0;
	      
	      double T2a = -Two_Third_CoxWL * Vgst;
	      double T3 = -(T2 + Two_Third_CoxWL * dVth_dVb);
	      d->qbulk = -(d->qgate + T2a);
	      d->cbgb = -(d->cggb - Two_Third_CoxWL * dVgs_eff_dVg);
	      d->cbsb = -(d->cbgb + T3);
	      d->cbdb = 0.0;

	      d->qdrn = 0.0;
	      d->cdgb = 0.0;
	      d->cddb = 0.0;
	      d->cdsb = 0.0;
	    }else{
	      /* linear region */
	      double Alphaz = Vgst / Vdsat;
	      double T1 = 2.0 * Vdsat - d->vds;
	      double T2 = d->vds / (3.0 * T1);
	      double T3 = T2 * d->vds;
	      double T9 = 0.25 * CoxWL;
	      double T4 = T9 * Alphaz;
	      double T7 = 2.0 * d->vds - T1 - 3.0 * T3;
	      double T8 = T3 - T1 - 2.0 * d->vds;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - 0.5 * (d->vds-T3));
	      double T10 = T4 * T8;
	      d->qdrn = T4 * T7;
	      d->qbulk = -(d->qgate + d->qdrn + T10);
	      
	      double T5 = T3 / T1;
	      d->cggb = CoxWL * (1.0 - T5 * dVdsat_dVg) * dVgs_eff_dVg;
	      double T11 = -CoxWL * T5 * dVdsat_dVb;
	      d->cgdb = CoxWL * (T2 - 0.5 + 0.5 * T5);
	      d->cgsb = -(d->cggb + T11 + d->cgdb);

	      double T6 = 1.0 / Vdsat;
	      double dAlphaz_dVg = T6 * (1.0 - Alphaz * dVdsat_dVg);
	      double dAlphaz_dVb = -T6 * (dVth_dVb + Alphaz * dVdsat_dVb);
	      T7 = T9 * T7;
	      T8 = T9 * T8;
	      T9 = 2.0 * T4 * (1.0 - 3.0 * T5);
	      d->cdgb = (T7 * dAlphaz_dVg - T9 * dVdsat_dVg) * dVgs_eff_dVg;
	      double T12 = T7 * dAlphaz_dVb - T9 * dVdsat_dVb;
	      d->cddb = T4 * (3.0 - 6.0 * T2 - 3.0 * T5);
	      d->cdsb = -(d->cdgb + T12 + d->cddb);

	      T9 = 2.0 * T4 * (1.0 + T5);
	      T10 = (T8 * dAlphaz_dVg - T9 * dVdsat_dVg) * dVgs_eff_dVg;
	      T11 = T8 * dAlphaz_dVb - T9 * dVdsat_dVb;
	      T12 = T4 * (2.0 * T2 + T5 - 1.0); 
	      double T0 = -(T10 + T11 + T12);
	      d->cbgb = -(d->cggb + d->cdgb + T10);
	      d->cbdb = -(d->cgdb + d->cddb + T12);
	      d->cbsb = -(d->cgsb + d->cdsb + T0);
	    }
	  }else if (m->xpart < 0.5) {
	    /* 40/60 Charge petition model */
	    if (d->vds >= Vdsat) {
	      /* saturation region */
	      double T1 = Vdsat / 3.0;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - T1);
	      double T2 = -Two_Third_CoxWL * Vgst;
	      d->qbulk = -(d->qgate + T2);
	      d->qdrn = 0.4 * T2;

	      d->cggb = One_Third_CoxWL * (3.0 - dVdsat_dVg) * dVgs_eff_dVg;
	      T2 = -One_Third_CoxWL * dVdsat_dVb;
	      d->cgsb = -(d->cggb + T2);
	      d->cgdb = 0.0;
       
	      double T3 = 0.4 * Two_Third_CoxWL;
	      d->cdgb = -T3 * dVgs_eff_dVg;
	      d->cddb = 0.0;
	      double T4 = T3 * dVth_dVb;
	      d->cdsb = -(T4 + d->cdgb);
	      
	      d->cbgb = -(d->cggb - Two_Third_CoxWL * dVgs_eff_dVg);
	      T3 = -(T2 + Two_Third_CoxWL * dVth_dVb);
	      d->cbsb = -(d->cbgb + T3);
	      d->cbdb = 0.0;
	    }else{
	      /* linear region  */
	      double T1 = 2.0 * Vdsat - d->vds;
	      double T2 = d->vds / (3.0 * T1);
	      double T3 = T2 * d->vds;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - 0.5 * (d->vds - T3));
	      double T5 = T3 / T1;
	      d->cggb = CoxWL * (1.0 - T5 * dVdsat_dVg) * dVgs_eff_dVg;
	      double tmp = -CoxWL * T5 * dVdsat_dVb;
	      d->cgdb = CoxWL * (T2 - 0.5 + 0.5 * T5);
	      d->cgsb = -(d->cggb + d->cgdb + tmp);

	      double T6 = 1.0 / Vdsat;
	      double Alphaz      =  T6 * Vgst;
	      double dAlphaz_dVg =  T6 * (1.0 - Alphaz * dVdsat_dVg);
	      double dAlphaz_dVb = -T6 * (dVth_dVb + Alphaz * dVdsat_dVb);
	      T6 = 8.0 * Vdsat * Vdsat - 6.0 * Vdsat * d->vds 
		+ 1.2 * d->vds * d->vds;
	      double T8 = T2 / T1;
	      double T7 = d->vds - T1 - T8 * T6;
	      double T9 = 0.25 * CoxWL;
	      double T4 = T9 * Alphaz;
	      d->qdrn = T4 * T7;
	      T7 *= T9;
	      tmp = T8 / T1;
	      double tmp1 = T4 * (2.0 - 4.0 * tmp * T6
			   + T8 * (16.0 * Vdsat - 6.0 * d->vds));
	      d->cdgb = (T7 * dAlphaz_dVg - tmp1 * dVdsat_dVg) * dVgs_eff_dVg;
	      double T10 = T7 * dAlphaz_dVb - tmp1 * dVdsat_dVb;
	      d->cddb = T4 * (2.0 - (1.0 / (3.0 * T1 * T1) + 2.0 * tmp) * T6 
			      + T8 * (6.0 * Vdsat - 2.4 * d->vds));
	      d->cdsb = -(d->cdgb + T10 + d->cddb);

	      T7 = 2.0 * (T1 + T3);
	      d->qbulk = -(d->qgate - T4 * T7);
	      T7 *= T9;
	      double T0 = 4.0 * T4 * (1.0 - T5);
	      double T12 = (-T7 * dAlphaz_dVg - d->cdgb - T0 * dVdsat_dVg)
		* dVgs_eff_dVg;
	      double T11 = -T7 * dAlphaz_dVb - T10 - T0 * dVdsat_dVb;
	      T10 = -4.0 * T4 * (T2 - 0.5 + 0.5 * T5) - d->cddb;
	      tmp = -(T10 + T11 + T12);
	      d->cbgb = -(d->cggb + d->cdgb + T12);
	      d->cbdb = -(d->cgdb + d->cddb + T11);
	      d->cbsb = -(d->cgsb + d->cdsb + tmp);
	      trace3("0,40/60,lin", T10, T11, T12);
	      trace3("0,40/60,lin", d->cbgb, d->cbdb, d->cbsb); 
	    }
	  }else{
	    /* 50/50 partitioning */
	    if (d->vds >= Vdsat) {
	      /* saturation region */
	      double T1 = Vdsat / 3.0;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - T1);
	      double T2 = -Two_Third_CoxWL * Vgst;
	      d->qbulk = -(d->qgate + T2);
	      d->qdrn = 0.5 * T2;
	      
	      T2 = -One_Third_CoxWL * dVdsat_dVb;
	      d->cggb = One_Third_CoxWL * (3.0 - dVdsat_dVg) * dVgs_eff_dVg;
	      d->cgsb = -(d->cggb + T2);
	      d->cgdb = 0.0;
	      
	      double T4 = One_Third_CoxWL * dVth_dVb;
	      d->cdgb = -One_Third_CoxWL * dVgs_eff_dVg;
	      d->cddb = 0.0;
	      d->cdsb = -(T4 + d->cdgb);
	      
	      double T3 = -(T2 + Two_Third_CoxWL * dVth_dVb);
	      d->cbgb = -(d->cggb - Two_Third_CoxWL * dVgs_eff_dVg);
	      d->cbsb = -(d->cbgb + T3);
	      d->cbdb = 0.0;
	    }else{
	      /* linear region */
	      double T1 = 2.0 * Vdsat - d->vds;
	      double T2 = d->vds / (3.0 * T1);
	      double T3 = T2 * d->vds;
	      double T5 = T3 / T1;
	      double tmp = -CoxWL * T5 * dVdsat_dVb;
	      d->qgate = CoxWL * (Vgs_eff - Vfb - t->phi - 0.5 * (d->vds-T3));
	      d->cggb = CoxWL * (1.0 - T5 * dVdsat_dVg) * dVgs_eff_dVg;
	      d->cgdb = CoxWL * (T2 - 0.5 + 0.5 * T5);
	      d->cgsb = -(d->cggb + d->cgdb + tmp);
	      
	      double T6 = 1.0 / Vdsat;
	      double Alphaz =       T6 * Vgst;
	      double dAlphaz_dVg =  T6 * (1.0 - Alphaz * dVdsat_dVg);
	      double dAlphaz_dVb = -T6 * (dVth_dVb + Alphaz * dVdsat_dVb);
	      
	      double T9 = 0.25 * CoxWL;
	      double T4 = T9 * Alphaz;
	      double T7 = T1 + T3;
	      d->qdrn = -T4 * T7;
	      d->qbulk = - (d->qgate + d->qdrn + d->qdrn);

	      T7 *= T9;
	      double T0 = T4 * (2.0 * T5 - 2.0);	      
	      double T12 = T0 * dVdsat_dVb - T7 * dAlphaz_dVb;
	      d->cdgb = (T0 * dVdsat_dVg - T7 * dAlphaz_dVg) * dVgs_eff_dVg;
	      d->cddb = T4 * (1.0 - 2.0 * T2 - T5);
	      d->cdsb = -(d->cdgb + T12 + d->cddb);
	      
	      d->cbgb = -(d->cggb + 2.0 * d->cdgb);
	      d->cbdb = -(d->cgdb + 2.0 * d->cddb);
	      d->cbsb = -(d->cgsb + 2.0 * d->cdsb);
	    }
	  }
	} // begins 1328 this 1618
	trace0("end capMod == 0");
	// end of else if (m->capMod == 0) line 1454 this 1709
      }else{
	trace0("begin capMod != 0 (mos7)");	
	assert(m->capMod != 0);
	double qsrc;
	double VbseffCV, dVbseffCV_dVb;
	if (Vbseff < 0.0) {
	  VbseffCV = Vbseff;
	  dVbseffCV_dVb = 1.0;
	}else{
	  VbseffCV = t->phi - Phis;
	  dVbseffCV_dVb = -dPhis_dVb;
	}
	trace2("", VbseffCV, dVbseffCV_dVb);

	//double Vth = d->von; // possibly wrong value -- scope problem
	double Vfb = d->von - t->phi - t->k1 * sqrtPhis;
	double dVfb_dVb = 0.;//////dVth_dVb - t->k1 * dsqrtPhis_dVb;
	double dVfb_dVd = 0.;//////dVth_dVd;

	//double Vgst = Vgs_eff - d->von;

	//trace3("", d->vgst, Vgst, VgstNVt);
	trace2("", n, t->vtm);

	double Vgsteff;
	{
	  if ((VgstNVt > -EXP_THRESHOLD) && (VgstNVt < EXP_THRESHOLD)) {
	    trace0("VgstNVt in range");
	    assert(ExpVgst != NOT_VALID);
	    ExpVgst *= ExpVgst;
	    ExpVgst = exp(VgstNVt); ////// test
	    trace1("", ExpVgst);
	    Vgsteff = n * t->vtm * log(1.0 + ExpVgst);
	    dVgsteff_dVg = ExpVgst / (1.0 + ExpVgst);
	    dVgsteff_dVd = -dVgsteff_dVg 
	      * (dVth_dVd + (Vgs_eff - d->von) / n * dn_dVd)
	      + Vgsteff / n * dn_dVd;
	    dVgsteff_dVb = -dVgsteff_dVg 
	      * (dVth_dVb + (Vgs_eff - d->von) / n * dn_dVb)
	      + Vgsteff / n * dn_dVb;
	    dVgsteff_dVg *= dVgs_eff_dVg;
	  }else{
	    Vgsteff = d->vgst;
	  }
	}
	trace4("", Vgsteff, dVgsteff_dVg, dVgsteff_dVd, dVgsteff_dVb);

	double CoxWL = m->cox * s->weffCV * s->leffCV;
	// redundant??

	if (m->capMod == 1) {
	  double Cgg, Cgd, Cgb;
	  {
	    double Arg1 = Vgs_eff - VbseffCV - Vfb - Vgsteff;
	    if (Arg1 <= 0.0) {
	      d->qgate = CoxWL * Arg1;
	      Cgg = CoxWL * (dVgs_eff_dVg - dVgsteff_dVg);
	      Cgd = -CoxWL * (dVfb_dVd + dVgsteff_dVd);
	      Cgb = -CoxWL * (dVfb_dVb + dVbseffCV_dVb + dVgsteff_dVb);
	    }else{
	      double T0 = 0.5 * t->k1;
	      double T1 = sqrt(T0 * T0 + Arg1);
	      double T2 = CoxWL * T0 / T1;
	      d->qgate = CoxWL * t->k1 * (T1 - T0);
	      Cgg = T2 * (dVgs_eff_dVg - dVgsteff_dVg);
	      Cgd = -T2 * (dVfb_dVd + dVgsteff_dVd);
	      Cgb = -T2 * (dVfb_dVb + dVbseffCV_dVb + dVgsteff_dVb);
	    }
	  }
	  d->qbulk = -d->qgate;
	  double Cbg = -Cgg;
	  double Cbd = -Cgd;
	  double Cbb = -Cgb;
	  
	  double AbulkCV = Abulk0 * s->abulkCVfactor;
	  double dAbulkCV_dVb = s->abulkCVfactor * dAbulk0_dVb;

	  double Csg, Csb, Csd;
	  {
	    double VdsatCV = Vgsteff / AbulkCV;
	    if (VdsatCV < d->vds) {
	      double One_Third_CoxWL = CoxWL / 3.0;
	      double Two_Third_CoxWL = 2.0 * One_Third_CoxWL;
	      double dVdsatCV_dVg = 1.0 / AbulkCV;
	      double dVdsatCV_dVb = -VdsatCV * dAbulkCV_dVb / AbulkCV;
	      {
		double T0 = Vgsteff - VdsatCV / 3.0;
		double dT0_dVg = 1.0 - dVdsatCV_dVg / 3.0;
		double dT0_dVb = -dVdsatCV_dVb / 3.0;
		d->qgate += CoxWL * T0;
		double Cgg1 = CoxWL * dT0_dVg; 
		double Cgb1 = CoxWL * dT0_dVb + Cgg1 * dVgsteff_dVb;
		double Cgd1 = Cgg1 * dVgsteff_dVd;
		Cgg1 *= dVgsteff_dVg;
		Cgg += Cgg1;
		Cgb += Cgb1;
		Cgd += Cgd1;
	      }
	      {
		double T0 = VdsatCV - Vgsteff;
		double dT0_dVg = dVdsatCV_dVg - 1.0;
		double dT0_dVb = dVdsatCV_dVb;
		d->qbulk += One_Third_CoxWL * T0;
		double Cbg1 = One_Third_CoxWL * dT0_dVg;
		double Cbb1 = One_Third_CoxWL * dT0_dVb + Cbg1 * dVgsteff_dVb;
		double Cbd1 = Cbg1 * dVgsteff_dVd;
		Cbg1 *= dVgsteff_dVg;
		Cbg += Cbg1;
		Cbb += Cbb1;
		Cbd += Cbd1;
	      }
	      double T0;
	      if (m->xpart > 0.5) {
		T0 = -Two_Third_CoxWL;
	      }else if (m->xpart < 0.5) {
		T0 = -0.4 * CoxWL;
	      }else{
		T0 = -One_Third_CoxWL;
	      }
	      qsrc = T0 * Vgsteff;
	      Csg = T0 * dVgsteff_dVg;
	      Csb = T0 * dVgsteff_dVb;
	      Csd = T0 * dVgsteff_dVd;
	      Cgb *= dVbseff_dVb;
	      Cbb *= dVbseff_dVb;
	      Csb *= dVbseff_dVb;
	    }else{
	      double T0 = AbulkCV * d->vds;
	      double T1 = 12.0 * (Vgsteff - 0.5 * T0 + 1.e-20);
	      double Cgg1, Cgb1, Cgd1, Cbg1, Cbb1, Cbd1;
	      {
		double T2 = d->vds / T1;
		double T3 = T0 * T2;
		double dT3_dVg = -12.0 * T2 * T2 * AbulkCV;
		double dT3_dVd = 6.0 * T0 * (4.0*Vgsteff - T0) / T1 / T1 - 0.5;
		double dT3_dVb = 12.0 * T2 * T2 * dAbulkCV_dVb * Vgsteff;
		
		d->qgate += CoxWL * (Vgsteff - 0.5 * d->vds + T3);
		Cgg1 = CoxWL * (1.0 + dT3_dVg);
		Cgb1 = CoxWL * dT3_dVb + Cgg1 * dVgsteff_dVb;
		Cgd1 = CoxWL * dT3_dVd + Cgg1 * dVgsteff_dVd;
		Cgg1 *= dVgsteff_dVg;
		Cgg += Cgg1;
		Cgb += Cgb1;
		Cgd += Cgd1;
		
		d->qbulk += CoxWL * (1.0 - AbulkCV) * (0.5 * d->vds - T3);
		Cbg1 = -CoxWL * ((1.0 - AbulkCV) * dT3_dVg);
		Cbb1 = -CoxWL * ((1.0 - AbulkCV) * dT3_dVb
				 + (0.5 * d->vds - T3) * dAbulkCV_dVb)
		  + Cbg1 * dVgsteff_dVb;
		Cbd1 = -CoxWL * (1.0 - AbulkCV) * dT3_dVd
		  + Cbg1 * dVgsteff_dVd;
		Cbg1 *= dVgsteff_dVg;
		Cbg += Cbg1;
		Cbb += Cbb1;
		Cbd += Cbd1;
	      }
	      if (m->xpart > 0.5) {
		/* 0/100 Charge petition model */
		T1 = T1 + T1;
		qsrc = -CoxWL * (0.5 * Vgsteff + 0.25 * T0 - T0 * T0 / T1);
		Csg = -CoxWL * (0.5 + 24.0 * T0 * d->vds / T1 / T1 * AbulkCV);
		Csb = -CoxWL * (0.25 * d->vds * dAbulkCV_dVb
			  - 12.0 * T0 * d->vds / T1 / T1 * (4.0 * Vgsteff - T0)
				* dAbulkCV_dVb) + Csg * dVgsteff_dVb;
		Csd = -CoxWL * (0.25 * AbulkCV - 12.0 * AbulkCV * T0
				/ T1 / T1 * (4.0 * Vgsteff - T0))
		  + Csg * dVgsteff_dVd;
		Csg *= dVgsteff_dVg;
	      }else if (m->xpart < 0.5) {
		/* 40/60 Charge petition model */
		T1 = T1 / 12.0;
		double T2 = 0.5 * CoxWL / (T1 * T1);
		double T3 = Vgsteff * (2.0 * T0 * T0 / 3.0 
				       + Vgsteff * (Vgsteff - 4.0 * T0 / 3.0))
		  - 2.0 * T0 * T0 * T0 / 15.0;
		qsrc = -T2 * T3;
		double T4 = 4.0 / 3.0 * Vgsteff * (Vgsteff-T0) + 0.4 * T0 * T0;
		Csg = -2.0 * qsrc / T1 
		  - T2 * (Vgsteff * (3.0 * Vgsteff - 8.0 * T0 / 3.0)
			  + 2.0 * T0 * T0 / 3.0);
		Csb = (qsrc / T1 * d->vds + T2 * T4 * d->vds) * dAbulkCV_dVb
		  + Csg * dVgsteff_dVb;
		Csd = (qsrc / T1 + T2 * T4) * AbulkCV + Csg * dVgsteff_dVd;
		Csg *= dVgsteff_dVg;
	      }else{
		/* 50/50 Charge petition model */
		qsrc = -0.5 * (d->qgate + d->qbulk);
		Csg = -0.5 * (Cgg1 + Cbg1);
		Csb = -0.5 * (Cgb1 + Cbb1); 
		Csd = -0.5 * (Cgd1 + Cbd1); 
	      }
	      Cgb *= dVbseff_dVb;
	      Cbb *= dVbseff_dVb;
	      Csb *= dVbseff_dVb;
	    }
	  }
	  d->qdrn = -(d->qgate + d->qbulk + qsrc);
	  d->cggb = Cgg;
	  d->cgsb = -(Cgg + Cgd + Cgb);
	  d->cgdb = Cgd;
	  d->cdgb = -(Cgg + Cbg + Csg);
	  d->cdsb = (Cgg + Cgd + Cgb + Cbg + Cbd + Cbb + Csg + Csd + Csb);
	  d->cddb = -(Cgd + Cbd + Csd);
	  d->cbgb = Cbg;
	  d->cbsb = -(Cbg + Cbd + Cbb);
	  d->cbdb = Cbd;
	  trace0("end capMod == 1");
	}else if (m->capMod == 2) {
	  trace0("begin capMod == 2");
	  double Qac0, dQac0_dVg, dQac0_dVd, dQac0_dVb;
	  double Qsub0, dQsub0_dVg, dQsub0_dVd, dQsub0_dVb;
	  {
	    double Vfbeff, dVfbeff_dVd, dVfbeff_dVg, dVfbeff_dVb;
	    {
	      const double DELTA_3 = 0.02;
	      double V3 = Vfb - Vgs_eff + VbseffCV - DELTA_3;
	      double T0, T2;
	      if (Vfb <= 0.0) {
		T0 = sqrt(V3 * V3 - 4.0 * DELTA_3 * Vfb);
		T2 = -DELTA_3 / T0;
	      }else{
		T0 = sqrt(V3 * V3 + 4.0 * DELTA_3 * Vfb);
		T2 = DELTA_3 / T0;
	      }
	      double T1 = 0.5 * (1.0 + V3 / T0);
	      Vfbeff = Vfb - 0.5 * (V3 + T0);
	      dVfbeff_dVd = (1.0 - T1 - T2) * dVfb_dVd;
	      dVfbeff_dVg = T1 * dVgs_eff_dVg;
	      dVfbeff_dVb = (1.0 - T1 - T2) * dVfb_dVb - T1 * dVbseffCV_dVb;
	    }
	    trace3("", Vfbeff, dVfbeff_dVg, dVfbeff_dVb);
	    trace1("", dVfbeff_dVd);

	    //double Qac0, dQac0_dVg, dQac0_dVd, dQac0_dVb;
	    {
	      Qac0 = CoxWL * (Vfbeff - Vfb);
	      dQac0_dVg = CoxWL * dVfbeff_dVg;
	      dQac0_dVd = CoxWL * (dVfbeff_dVd - dVfb_dVd);
	      dQac0_dVb = CoxWL * (dVfbeff_dVb - dVfb_dVb);
	    }

	    //double Qsub0, dQsub0_dVg, dQsub0_dVd, dQsub0_dVb;
	    {
	      double T0 = 0.5 * t->k1;
	      double T3 = Vgs_eff - Vfbeff - VbseffCV - Vgsteff;
	      double T1, T2;
	      if (t->k1 == 0.0) {
		T1 = 0.0;
		T2 = 0.0;
	      }else if (T3 < 0.0) {
		T1 = T0 + T3 / t->k1;
		T2 = CoxWL;
	      }else{
		T1 = sqrt(T0 * T0 + T3);
		T2 = CoxWL * T0 / T1;
	      }
	      Qsub0 = CoxWL * t->k1 * (T1 - T0);
	      dQsub0_dVg = T2 * (dVgs_eff_dVg - dVfbeff_dVg - dVgsteff_dVg);
	      dQsub0_dVd = -T2 * (dVfbeff_dVd + dVgsteff_dVd);
	      dQsub0_dVb = -T2 * (dVfbeff_dVb +dVbseffCV_dVb +dVgsteff_dVb);
	    }
	  }
	  trace3("", Qac0, dQac0_dVg, dQac0_dVb);
	  trace1("", dQac0_dVd);
	  trace4("", Qsub0, dQsub0_dVg, dQsub0_dVd, dQsub0_dVb);

	  double AbulkCV = Abulk0 * s->abulkCVfactor;
	  double dAbulkCV_dVb = s->abulkCVfactor * dAbulk0_dVb;
	  trace2("", AbulkCV, dAbulkCV_dVb);

	  double VdseffCV, dVdseffCV_dVg, dVdseffCV_dVd, dVdseffCV_dVb;
	  {
	    const double DELTA_4 = 0.02;
	    double VdsatCV = Vgsteff / AbulkCV;
	    double V4 = VdsatCV - d->vds - DELTA_4;
	    double T0 = sqrt(V4 * V4 + 4.0 * DELTA_4 * VdsatCV);
	    VdseffCV = VdsatCV - 0.5 * (V4 + T0);
	    double T1 = 0.5 * (1.0 + V4 / T0);
	    double T2 = DELTA_4 / T0;
	    double T3 = (1.0 - T1 - T2) / AbulkCV;
	    dVdseffCV_dVg = T3;
	    dVdseffCV_dVd = T1;
	    dVdseffCV_dVb = -T3 * VdsatCV * dAbulkCV_dVb;
	  }
	  trace4("", VdseffCV, dVdseffCV_dVg, dVdseffCV_dVd, dVdseffCV_dVb);

	  double T0 = AbulkCV * VdseffCV;
	  double T1 = 12.0 * (Vgsteff - 0.5 * T0 + 1e-20);
	  trace2("", T0, T1);
	  
	  double Cgg1, Cgd1, Cgb1, Cbg1, Cbd1, Cbb1;
	  // also 1st estimate of d->qgate, d->qbulk
	  {
	    double T2 = VdseffCV / T1;
	    double T3 = T0 * T2;
	    double T4 = (1.0 - 12.0 * T2 * T2 * AbulkCV);
	    double T5 = (6.0 * T0 * (4.0 * Vgsteff - T0) / (T1 * T1) - 0.5);
	    double T6 = 12.0 * T2 * T2 * Vgsteff;
	    d->qgate = CoxWL * (Vgsteff - 0.5 * VdseffCV + T3);
	    Cgg1 = CoxWL * (T4 + T5 * dVdseffCV_dVg);
	    Cgd1 = CoxWL * T5 * dVdseffCV_dVd + Cgg1 * dVgsteff_dVd;
	    Cgb1 = CoxWL * (T5 * dVdseffCV_dVb + T6 * dAbulkCV_dVb) 
	      + Cgg1 * dVgsteff_dVb;
	    Cgg1 *= dVgsteff_dVg;
	    
	    double T7 = 1.0 - AbulkCV;
	    d->qbulk = CoxWL * T7 * (0.5 * VdseffCV - T3);
	    T4 = -T7 * (T4 - 1.0);
	    T5 = -T7 * T5;
	    T6 = -(T7 * T6 + (0.5 * VdseffCV - T3));
	    Cbg1 = CoxWL * (T4 + T5 * dVdseffCV_dVg);
	    Cbd1 = CoxWL * T5 * dVdseffCV_dVd + Cbg1 * dVgsteff_dVd;
	    Cbb1 = CoxWL * (T5 * dVdseffCV_dVb + T6 * dAbulkCV_dVb)
	      + Cbg1 * dVgsteff_dVb;
	    Cbg1 *= dVgsteff_dVg;
	  }
	  trace3("", Cgg1, Cgd1, Cgb1);
	  trace3("", Cbg1, Cbd1, Cbb1);
	  trace2("2-1", d->qgate, d->qbulk);
	  
	  double Csg, Csd, Csb;
	  trace1("", m->xpart);
	  if (m->xpart > 0.5) {
	    trace0("0/100 Charge petition model");
	    T1 = T1 + T1;
	    qsrc = -CoxWL * (0.5 * Vgsteff + 0.25 * T0 - T0 * T0 / T1);
	    double T7 = (4.0 * Vgsteff - T0) / (T1 * T1);
	    double T4 = -(0.5 + 24.0 * T0 * T0 / (T1 * T1));
	    double T5 = -(0.25 * AbulkCV - 12.0 * AbulkCV * T0 * T7);
	    double T6 = -(0.25 * VdseffCV - 12.0 * T0 * VdseffCV * T7);
	    Csg = CoxWL * (T4 + T5 * dVdseffCV_dVg);
	    Csd = CoxWL * T5 * dVdseffCV_dVd + Csg * dVgsteff_dVd;
	    Csb = CoxWL * (T5 * dVdseffCV_dVb + T6 * dAbulkCV_dVb) 
	      + Csg * dVgsteff_dVb;
	    Csg *= dVgsteff_dVg;
	  }else if (m->xpart < 0.5) {
	    trace0("40/60 Charge petition model");
	    T1 = T1 / 12.0;
	    double T2 = 0.5 * CoxWL / (T1 * T1);
	    double T3 = Vgsteff * (2.0 * T0 * T0 / 3.0 + Vgsteff
				   * (Vgsteff - 4.0 * T0 / 3.0))
	      - 2.0 * T0 * T0 * T0 / 15.0;
	    qsrc = -T2 * T3;
	    double T7 = 4.0 / 3.0 * Vgsteff * (Vgsteff - T0) + 0.4 * T0 * T0;
	    double T4 = -2.0 * qsrc / T1 
	      - T2 * (Vgsteff * (3.0 * Vgsteff - 8.0 * T0 / 3.0)
		      + 2.0 * T0 * T0 / 3.0);
	    double T5 = (qsrc / T1 + T2 * T7) * AbulkCV;
	    double T6 = (qsrc / T1 * VdseffCV + T2 * T7 * VdseffCV);
	    Csg = (T4 + T5 * dVdseffCV_dVg);
	    Csd = T5 * dVdseffCV_dVd + Csg * dVgsteff_dVd;
	    Csb = (T5 * dVdseffCV_dVb + T6 * dAbulkCV_dVb) 
	      + Csg * dVgsteff_dVb;
	    Csg *= dVgsteff_dVg;
	  }else{
	    trace0("50/50 Charge petition model");
	    qsrc = -0.5 * (d->qgate + d->qbulk);
	    Csg = -0.5 * (Cgg1 + Cbg1);
	    Csb = -0.5 * (Cgb1 + Cbb1); 
	    Csd = -0.5 * (Cgd1 + Cbd1); 
	  }
	  trace4("", Csg, Csd, Csb, qsrc);

	  d->qgate += Qac0 + Qsub0;
	  d->qbulk -= (Qac0 + Qsub0);
	  d->qdrn = -(d->qgate + d->qbulk + qsrc);
	  trace3("2-2", d->qgate, d->qbulk, d->qdrn);
	  
	  double Cgg = dQac0_dVg + dQsub0_dVg + Cgg1;
	  double Cgd = dQac0_dVd + dQsub0_dVd + Cgd1;
	  double Cgb = dQac0_dVb + dQsub0_dVb + Cgb1;
	  trace3("", Cgg, Cgd, Cgb);
	  
	  double Cbg = Cbg1 - dQac0_dVg - dQsub0_dVg;
	  double Cbd = Cbd1 - dQac0_dVd - dQsub0_dVd;
	  double Cbb = Cbb1 - dQac0_dVb - dQsub0_dVb;
	  trace3("", Cbg, Cbd, Cbb);

	  Cgb *= dVbseff_dVb;
	  Cbb *= dVbseff_dVb;
	  Csb *= dVbseff_dVb;
	  trace3("adjusted", Cgb, Cbb, Csb);
	  
	  d->cggb = Cgg;
	  d->cgsb = -(Cgg + Cgd + Cgb);
	  d->cgdb = Cgd;
	  d->cdgb = -(Cgg + Cbg + Csg);
	  d->cdsb = (Cgg + Cgd + Cgb + Cbg + Cbd + Cbb + Csg + Csd + Csb);
	  d->cddb = -(Cgd + Cbd + Csd);
	  d->cbgb = Cbg;
	  d->cbsb = -(Cbg + Cbd + Cbb);
	  d->cbdb = Cbd;
	  trace0("end capMod == 2");
	}else{
	  error(bDANGER, "illegal capmod = %d\n", int(m->capMod));
	  d->qbulk = d->qgate = NOT_VALID;
	}

	/* Non-quasi-static Model */
	double tconst;
	if (m->nqsMod) {
	  //  d->gtau
	  double qcheq = -d->qbulk - d->qgate;
	  double T0 = s->leffCV * s->leffCV;
	  tconst = t->u0temp * s->elm / CoxWL / T0;
	  if (qcheq == 0.0) {
	    tconst = 0.0;
	  }else if (qcheq < 0.0) {
	    tconst = -tconst;
	  }else{
	  }
	  double gtau_drift = std::abs(tconst * qcheq);
	  double gtau_diff = 16.0 * t->u0temp * t->vtm / T0;
	  d->gtau =  gtau_drift + gtau_diff;
	  d->cqgb = -(d->cggb + d->cbgb);
	  d->cqdb = -(d->cgdb + d->cbdb);
	  d->cqsb = -(d->cgsb + d->cbsb);
	  d->cqbb = d->cggb +d->cgdb +d->cgsb +d->cbgb +d->cbdb +d->cbsb;
	  
	  d->qbulk = d->qgate = d->qdrn = qsrc = 0.0;
	  d->cggb = d->cgsb = d->cgdb = 0.0;
	  d->cdgb = d->cdsb = d->cddb = 0.0;
	  d->cbgb = d->cbsb = d->cbdb = 0.0;
#if 0
	  *(ckt->CKTstate0 + d->qcheq) = qcheq;
	  if (ckt->CKTmode & MODEINITTRAN)
	    *(ckt->CKTstate1 + d->qcheq) = *(ckt->CKTstate0 + d->qcheq);
	  error = NIintegrate(ckt, &geq, &ceq, 0.0, d->qcheq);
	  if (error) return (error);
#endif
	}else{
	  d->gtau = 0.0;
	  d->cqgb = d->cqdb = d->cqsb = d->cqbb = 0.0;
	}
      }
    }
    trace0("mos7");
    trace3("", d->qgate, d->qdrn, d->qbulk);
    trace3("", d->cggb, d->cgsb, d->cgdb);
    trace3("", d->cdgb, d->cdsb, d->cddb);
    trace3("", d->cbgb, d->cbsb, d->cbdb);

    trace2("", d->ids, d->gds);
    trace4("", d->gmf, d->gmr, d->gmbf, d->gmbr);
    //trace4("", d->isub, d->gbbs, d->gbgs, d->gbds);
    trace4("", d->qgate, d->cggb, d->cgsb, d->cgdb);
    trace4("", d->qdrn, d->cdgb, d->cdsb, d->cddb);
    trace4("", d->qbulk, d->cbgb, d->cbsb, d->cbdb);
    trace1("", d->gtau);
    trace4("", d->cqgb, d->cqsb, d->cqdb, d->cqbb);
    //trace1("", d->tconst);
    //trace2("", d->cgb, d->qgb);
    //trace2("", d->qgd, d->cgd);
    trace2("", d->qgs, d->cgs);
    trace3("", d->vgs, d->vds, d->vbs);
    trace3("", d->vdsat, d->vgst, d->von);
  }
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/