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/* $Id: d_mos1.model,v 26.133 2009/11/26 04:58:04 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.
*------------------------------------------------------------------
* mos model equations: spice level 1 equivalent
*/
h_headers {
#include "d_mos123.h"
}
cc_headers {
}
/*--------------------------------------------------------------------------*/
model BUILT_IN_MOS1 {
level 1;
public_keys {
nmos1 polarity=pN;
pmos1 polarity=pP;
nmos polarity=pN;
pmos polarity=pP;
}
dev_type BUILT_IN_MOS;
inherit BUILT_IN_MOS123;
independent {
override {
double mjsw "" default=.5;
double cox "" final_default=0.;
double vto "" final_default=0.;
double gamma "" final_default=0.;
double phi "" final_default=.6;
int mos_level "back-annotate for diode" name=DIODElevel
print_test="mos_level != LEVEL" default=LEVEL;
}
raw_parameters {
double kp "transconductance parameter"
name=KP final_default=2e-5
print_test="!calc_kp" calc_print_test="calc_kp";
}
calculated_parameters {
bool calc_kp "" default=false;
}
code_pre {
if (tox != NA) {
cox = P_EPS_OX / tox;
if (kp == NA) {
kp = uo * cox;
calc_kp = true;
}
if (nsub != NA) {
if (phi == NA) {
phi = (2. * P_K_Q) * tnom_k * log(nsub/NI);
if (phi < .1) {
untested();
error(((!_sim->is_first_expand()) ? (bDEBUG) : (bWARNING)),
long_label() + ": calculated phi too small, using .1\n");
phi = .1;
}
calc_phi = true;
}
if (gamma == NA) {
gamma = sqrt(2. * P_EPS_SI * P_Q * nsub) / cox;
calc_gamma = true;
}
if (vto == NA) {
double phi_ms = (tpg == gtMETAL)
? polarity * (-.05 - (egap + polarity * phi) / 2.)
: -(tpg * egap + phi) / 2.;
double vfb = phi_ms - polarity * P_Q * nss / cox;
vto = vfb + phi + gamma * sqrt(phi);
calc_vto = true;
}
}else{
// tox is input, nsub isn't
}
}
}
}
temperature_dependent {
calculated_parameters {
double phi "" calculate="m->phi*tempratio + (-2*vt*(1.5*log(tempratio)+P_Q*(arg)))";
double beta "" calculate="(m->kp / tempratio4) * s->w_eff / s->l_eff";
double sqrt_phi "" calculate="sqrt(phi)";
double egap "" calculate="egap_";
}
code_pre {
double temp = d->_sim->_temp_c + P_CELSIUS0;
double tempratio = temp / m->tnom_k;
double tempratio4 = tempratio * sqrt(tempratio);
double kt = temp * P_K;
double vt = temp * P_K_Q;
double egap_ = 1.16 - (7.02e-4*temp*temp) / (temp+1108.);
double arg = (m->egap*tempratio - egap_) / (2*kt);
}
}
/*-----------------------------------------------------------------------*/
tr_eval {
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
trace0(d->long_label().c_str());
trace3("", d->vds, d->vgs, d->vbs);
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
d->reverse_if_needed();
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
double sarg, dsarg_dvbs;
{
if (d->vbs <= 0.) {
sarg = sqrt(t->phi - d->vbs);
dsarg_dvbs = -.5 / sarg;
d->sbfwd = false;
trace2("sb-ok", sarg, dsarg_dvbs);
}else{
untested();
sarg = t->sqrt_phi / (1. + .5 * d->vbs / t->phi);
dsarg_dvbs = -.5 * sarg * sarg / t->phi*t->sqrt_phi; /* is wrong!! */
d->sbfwd = true;
trace2("***sb-reversed***", sarg, dsarg_dvbs);
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
d->von = m->vto + m->gamma * (sarg - sqrt(m->phi))
+ .5 * (m->egap - t->egap) + .5 * (t->phi - m->phi);
d->vgst = d->vdsat = d->vgs - d->von;
if (d->vdsat < 0.) {
d->vdsat = 0.;
}
d->cutoff = (d->vgst < 0.);
d->saturated = (d->vds > d->vdsat);
trace3("", d->von, d->vgst, d->vdsat);
double Lambda = (m->lambda != NA) ? m->lambda : 0.;
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
if (d->cutoff) {
d->gds = d->gmf = d->ids = d->gmbf = 0.;
trace4("cut", d->ids, d->gmf, d->gds, d->gmbf);
}else if (d->saturated) {
d->gmf = t->beta * d->vgst * (1. + Lambda * d->vds);
d->ids = d->gmf * (.5 * d->vgst);
d->gds = .5 * t->beta * Lambda * d->vgst * d->vgst;
d->gmbf = - d->gmf * m->gamma * dsarg_dvbs;
trace4("sat", d->ids, d->gmf, d->gds, d->gmbf);
}else{ /* triode */
d->gmf = t->beta * d->vds * (1. + Lambda * d->vds);
d->ids = d->gmf * (d->vgst - .5*d->vds);
d->gds = t->beta * ((d->vgst - d->vds)
+ Lambda * d->vds * (2.*d->vgst - 1.5*d->vds));
d->gmbf = -d->gmf * m->gamma * dsarg_dvbs;
trace4("lin", d->ids, d->gmf, d->gds, d->gmbf);
}
if (d->reversed) {
d->ids *= -1;
d->gmr = d->gmf;
d->gmbr = d->gmbf;
d->gmf = d->gmbf = 0;
}else{
d->gmr = d->gmbr = 0.;
}
}
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
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