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/*$Id: e_exp_ac.cc,v 11.30 96/03/17 19:21:06 al Exp $ -*- C++ -*-
* Takes care of nonlinearities, behavioral modeling, etc. in ac analysis.
*/
#include "e_compon.h"
#include "error.h"
#include "e_exp.h"
#include "s__.h"
/*--------------------------------------------------------------------------*/
void acfix(COMPONENT*);
static void acf_ac(const COMPONENT*,double**,COMPLEX*);
static void acf_dc(const COMPONENT*,double**,COMPLEX*);
static void acf_dctran(const COMPONENT*,double**,COMPLEX*);
static void acf_frequency(const COMPONENT*,double**,COMPLEX*);
static void acf_period(const COMPONENT*,double**,COMPLEX*);
static void acf_ramp(const COMPONENT*,double**,COMPLEX*);
static void acf_time(const COMPONENT*,double**,COMPLEX*);
static void acf_tran(const COMPONENT*,double**,COMPLEX*);
static void acf_bandwidth(const COMPONENT*,double**,COMPLEX*);
static void acf_complex(const COMPONENT*,double**,COMPLEX*);
static void acf_cornerdown(const COMPONENT*,double**,COMPLEX*);
static void acf_cornerup(const COMPONENT*,double**,COMPLEX*);
static void acf_delay(const COMPONENT*,double**,COMPLEX*);
static void acf_exp(const COMPONENT*,double**,COMPLEX*);
static void acf_expterm(const COMPONENT*,double**,COMPLEX*);
static void acf_generator(const COMPONENT*,double**,COMPLEX*);
static void acf_max(const COMPONENT*,double**,COMPLEX*);
static void acf_netfunc(const COMPONENT*,double**,COMPLEX*);
static void acf_notch(const COMPONENT*,double**,COMPLEX*);
static void acf_numeric(const COMPONENT*,double**,COMPLEX*);
static void acf_offset(const COMPONENT*,double**,COMPLEX*);
static void acf_polar(const COMPONENT*,double**,COMPLEX*);
static void acf_polyterm(const COMPONENT*,double**,COMPLEX*);
static void acf_pulse(const COMPONENT*,double**,COMPLEX*);
static void acf_pwl(const COMPONENT*,double**,COMPLEX*);
static void acf_sffm(const COMPONENT*,double**,COMPLEX*);
static void acf_sin(const COMPONENT*,double**,COMPLEX*);
static void acf_tanh(const COMPONENT*,double**,COMPLEX*);
static void acf_ic(const COMPONENT*,double**,COMPLEX*);
static void acf_ii(const COMPONENT*,double**,COMPLEX*);
static void acf_iv(const COMPONENT*,double**,COMPLEX*);
static void acf_tempco(const COMPONENT*,double**,COMPLEX*);
/*--------------------------------------------------------------------------*/
#define arg0 (arg[0][0])
#define arg1 (arg[0][1])
#define arg2 (arg[0][2])
#define arg3 (arg[0][3])
#define arg4 (arg[0][4])
#define arg5 (arg[0][5])
#define arg6 (arg[0][6])
#define arg7 (arg[0][7])
static bool skip;
static double bias;
/*--------------------------------------------------------------------------*/
void acfix(COMPONENT* brh)
{
COMPLEX & y = brh->ev; /* return value */
if (brh->issource()){
skip = true;
y = 0.;
}else{
skip = false;
y = brh->val;
}
bias = brh->acbias;
if (brh->x){
struct expr *x;
double *arg;
int *key;
x = (struct expr*)brh->x;
arg = x->args->args;
for (key = x->keys->args; *key; key++){
switch (*key){
case eAC: acf_ac(brh,&arg,&y); break;
case eDC: acf_dc(brh,&arg,&y); break;
case eDCTRAN: acf_dctran(brh,&arg,&y); break;
case eFREQUENCY: acf_frequency(brh,&arg,&y); break;
case ePERIOD: acf_period(brh,&arg,&y); break;
case eRAMP: acf_ramp(brh,&arg,&y); break;
case eTIME: acf_time(brh,&arg,&y); break;
case eTRAN: acf_tran(brh,&arg,&y); break;
case eBANDWIDTH: acf_bandwidth(brh,&arg,&y); break;
case eCOMPLEX: acf_complex(brh,&arg,&y); break;
case eCORNERDOWN: acf_cornerdown(brh,&arg,&y); break;
case eCORNERUP: acf_cornerup(brh,&arg,&y); break;
case eDELAY: acf_delay(brh,&arg,&y); break;
case eEXP: acf_exp(brh,&arg,&y); break;
case eEXPTERM: acf_expterm(brh,&arg,&y); break;
case eGENERATOR: acf_generator(brh,&arg,&y); break;
case eMAX: acf_max(brh,&arg,&y); break;
case eNETFUNC: acf_netfunc(brh,&arg,&y); break;
case eNOTCH: acf_notch(brh,&arg,&y); break;
case eNUMERIC: acf_numeric(brh,&arg,&y); break;
case eOFFSET: acf_offset(brh,&arg,&y); break;
case ePOLAR: acf_polar(brh,&arg,&y); break;
case ePOLYTERM: acf_polyterm(brh,&arg,&y); break;
case ePULSE: acf_pulse(brh,&arg,&y); break;
case ePWL: acf_pwl(brh,&arg,&y); break;
case eSFFM: acf_sffm(brh,&arg,&y); break;
case eSIN: acf_sin(brh,&arg,&y); break;
case eTANH: acf_tanh(brh,&arg,&y); break;
case eIC: acf_ic(brh,&arg,&y); break;
case eII: acf_ii(brh,&arg,&y); break;
case eIV: acf_iv(brh,&arg,&y); break;
case eTEMPCO: acf_tempco(brh,&arg,&y); break;
default: error(bWARNING, "%s: undefined function: %d\n",
brh->printlabel(), *key); break;
}
}
}
}
/*--------------------------------------------------------------------------*/
/* acf_ac: keyword: ac
* following args for ac analysis only
* here : do it
* no args
*/
/*ARGSUSED*/
static void acf_ac(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
*y = 0.;
skip = false;
*arg += aAC;
}
/*--------------------------------------------------------------------------*/
/* acf_dc: keyword: dc
* following args for dc analysis only
* here: skip them
* no args
*/
/*ARGSUSED*/
static void acf_dc(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aDC;
}
/*--------------------------------------------------------------------------*/
/* acf_dctran: keyword: dctran
* following args for dc and transient analysis
* here: skip them
* no args
*/
/*ARGSUSED*/
static void acf_dctran(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aDCTRAN;
}
/*--------------------------------------------------------------------------*/
/* acf_frequency: keyword: frequency
* the value is frequency dependent (ac only)
* works only in ac analysis, otherwise could be non-causal.
* arg0 = test freq
*/
/*ARGSUSED*/
static void acf_frequency(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
error(bWARNING,"frequency not implemented: %s\n", brh->printlabel());
*arg += aFREQUENCY;
}
/*--------------------------------------------------------------------------*/
/* acf_period: keyword: period
* periodic in time
* implies that following args for transient analysis only.
* here: skip them
* arg0 = period
*/
/*ARGSUSED*/
static void acf_period(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aPERIOD;
}
/*--------------------------------------------------------------------------*/
/* acf_ramp: keyword: ramp
* ramp value between plotted points
* transient only: skip here
*/
/*ARGSUSED*/
static void acf_ramp(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aRAMP;
}
/*--------------------------------------------------------------------------*/
/* acf_time: keyword: time
* following args take effect at the given time (switch)
* obviously, transient only.
* arg0 = switch time
*/
/*ARGSUSED*/
static void acf_time(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aTIME;
}
/*--------------------------------------------------------------------------*/
/* acf_tran: keyword: transient
* following args for transient analysis only.
* no args
*/
/*ARGSUSED*/
static void acf_tran(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
skip = true;
*arg += aTRAN;
}
/*--------------------------------------------------------------------------*/
/* acf_bandwidth: function: bandwidth
* gain block, with a bandwidth. (ac only)
* bad design: should be keyword instead.
* arg0 = dc gain
* arg1 = 3 db freq.
*/
/*ARGSUSED*/
static void acf_bandwidth(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip && arg1 != 0.){
double ratio;
double coeff;
ratio = SIM::freq / arg1;
coeff = arg0 / (1.+(ratio*ratio));
*y += COMPLEX(coeff, -coeff * ratio);
}
*arg += aBANDWIDTH;
}
/*--------------------------------------------------------------------------*/
/* acf_complex: function: complex
* complex value, cartesian coordinates, in frequency domain (ac only)
* arg0 = real part
* arg1 = imaginary part
*/
/*ARGSUSED*/
static void acf_complex(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip)
*y += COMPLEX(arg0, arg1);
*arg += aCOMPLEX;
}
/*--------------------------------------------------------------------------*/
/* acf_cornerdown: function: cornerdown
* piecewise linear function:
* output is 0 for bias >= arg1
* derivative is arg0 for bias <= arg1
* arg0 = active slope
* arg1 = break point
*/
static void acf_cornerdown(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip && bias < arg1)
*y += arg0;
*arg += aCORNERDOWN;
}
/*--------------------------------------------------------------------------*/
/* acf_cornerup: function: cornerup
* piecewise linear function:
* output is 0 for bias <= arg1
* derivative is arg0 for bias >= arg1
* arg0 = active slope
* arg1 = break point
*/
static void acf_cornerup(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip && bias > arg1)
*y += arg0;
*arg += aCORNERUP;
}
/*--------------------------------------------------------------------------*/
/* acf_delay: function: delay
* time delay (ac only)
* arg0 = magnitude
* arg1 = delay
*/
static void acf_delay(const COMPONENT* brh, double **arg, COMPLEX* y)
{
if (!skip){
double ratio;
ratio = SIM::freq * arg1;
if (ratio > 100000.){
error(bPICKY, "delay too long: %s\n", brh->printlabel());
ratio = 0.;
}
*y += polar(arg0, -360.0 * DTOR * ratio);
}
*arg += aDELAY;
}
/*--------------------------------------------------------------------------*/
/* acf_exp: spice compatible function: exp
* spice source exponential function: exponential function of time
* no-op in ac analysis, with a complaint
* arg0 = initial value
* arg1 = pulsed value
* arg2 = rise delay
* arg3 = rise time const
* arg4 = fall delay
* arg5 = fall time const
*/
/*ARGSUSED*/
static void acf_exp(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
if (!skip)
error(bDEBUG,"%s: exp not supported in ac analysis\n",brh->printlabel());
*arg += aEXP;
}
/*--------------------------------------------------------------------------*/
/* acf_expterm: function: expterm
* exponent term, non-integer power term (not exponential)
* like polyterm, but for non-integers
* only works for positive input, because negative number raised to
* non-integer power is usually complex.
* arg0 = coefficient
* arg1 = exponent
*/
static void acf_expterm(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip && bias > 0.){
double coeff;
coeff = arg0 * pow(bias,arg1-1);
*y += coeff * arg1;
}
*arg += aEXPTERM;
}
/*--------------------------------------------------------------------------*/
/* acf_generator: function: generator
* value is derived from the "signal generator" (generator command)
* intended for fixed sources, as circuit input.
* arg0 = scale factor
*/
/*ARGSUSED*/
static void acf_generator(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip)
*y += arg0;
*arg += aGENERATOR;
}
/*--------------------------------------------------------------------------*/
/* acf_max: function: max
* piecewise linear function: block that clips
* bad design: should be keyword, so it can apply to the total part
* should be able to specify upper and lower limits
* arg0 = normal value
* arg1 = output clip pt
*/
static void acf_max(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip && arg0 != 0.){
double clip_input;
clip_input = arg1/arg0;
if (bias >= -clip_input && bias <= clip_input)
*y += arg0;
}
*arg += aMAX;
}
/*--------------------------------------------------------------------------*/
/* acf_netfunc: function: netfunction
* gain block, nth order response. (ac only)
* BUG: only partial checking for number of args
* arg0 = arg count
* arg1 = dc gain
* arg2 = ref frequency
* arg3 = order of denom
* arg* = coefs of denom
* arg* = coefs of numer
*/
/*ARGSUSED*/
static void acf_netfunc(const COMPONENT* brh, double **arg, COMPLEX* y)
{
int argcount;
argcount = (int)arg0;
if (!skip && arg1 != 0.){
double *denomcoeff; /* coefficients of denominator */
double *numercoeff; /* coefficients of numerator */
int denomorder; /* order of denominator (#coefs = order + 1) */
int numerorder; /* order of numerator */
double wacc; /* stash for powers of f */
COMPLEX denom; /* denominator */
COMPLEX numer; /* numerator */
int ii; /* generic loop index */
double normfreq; /* normalized frequency */
double nf2; /* " " squared */
normfreq = SIM::freq / ((arg2 != 0.) ? arg2 : 1./kPIx2);
nf2 = normfreq * normfreq;
denomorder = (int)arg3;
numerorder = argcount - denomorder - 6;
if (numerorder > denomorder){
numerorder = denomorder;
error(bWARNING, "%s: too many args\n", brh->printlabel());
}else if (numerorder < 0){
denomorder += numerorder;
numerorder = 0;
error(bWARNING, "%s: too few args\n", brh->printlabel());
}
denomcoeff = &(arg[0][4]);
numercoeff = &(arg[0][5+denomorder]);
wacc = 1.;
denom = denomcoeff[0]; /* * wacc */
for (ii = 2; ii <= denomorder; ii += 2){
wacc *= -nf2;
denom += denomcoeff[ii] * wacc;
}
wacc = normfreq;
denom = COMPLEX(0., denomcoeff[1] * wacc);
for (ii = 3; ii <= denomorder; ii += 2){
wacc *= -nf2;
denom += COMPLEX(0., denomcoeff[ii] * wacc);
}
wacc = 1.;
numer = numercoeff[0]; /* * wacc */
for (ii = 2; ii <= numerorder; ii += 2){
wacc *= -nf2;
numer += numercoeff[ii] * wacc;
}
wacc = normfreq;
numer = COMPLEX(0., numercoeff[1] * wacc);
for (ii = 3; ii <= numerorder; ii += 2){
wacc *= -nf2;
numer += COMPLEX(0., numercoeff[ii] * wacc);
}
*y += arg1 * numer / denom;
}
*arg += argcount;
}
/*--------------------------------------------------------------------------*/
/* acf_notch: function: notch
* piecewise linear function: crossover notch, dead zone
* symmetric around zero
* arg0 = normal value
* arg1 = dead zone size
*/
static void acf_notch(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip){
if (bias > arg1 || bias < -arg1)
*y += arg0;
}
*arg += aNOTCH;
}
/*--------------------------------------------------------------------------*/
/* acf_numeric: simple numeric argument
* arg0 = value
*/
/*ARGSUSED*/
static void acf_numeric(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip)
*y += arg0;
*arg += aNUMERIC;
}
/*--------------------------------------------------------------------------*/
/* acf_offset: function: offset
* fixed dc offset
* bad design: should be keyword
* arg0 = gain
* arg1 = output offset
*/
/*ARGSUSED*/
static void acf_offset(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip)
*y += arg0;
*arg += aOFFSET;
}
/*--------------------------------------------------------------------------*/
/* acf_polar: function: polar
* complex value in polar coordinates, in frequency domain (ac only)
* arg0 = magnitude
* arg1 = phase
*/
/*ARGSUSED*/
static void acf_polar(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip)
*y += polar(arg0, arg1);
*arg += aPOLAR;
}
/*--------------------------------------------------------------------------*/
/* acf_polyterm: function: polyterm
* polynomial term, one term in a polynomial
* power must be integer, is rounded to nearest integer
* caution: will divide by zero with zero input and negative exponent
* arg0 = coefficient
* arg1 = exponent
*/
static void acf_polyterm(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip){
int expo;
expo = (int)floor(arg1+.5);
if (expo != 0){
double coeff;
coeff = arg0 * pow(bias,expo-1);
*y += coeff * expo;
}
}
*arg += aPOLYTERM;
}
/*--------------------------------------------------------------------------*/
/* acf_pulse: spice compatible function: pulse
* spice pulse function (for sources)
* no-op in ac analysis, with a complaint
* arg0 = initial value
* arg1 = pulsed value
* arg2 = delay time
* arg3 = rise time
* arg4 = fall time
* arg5 = pulse width
* arg6 = period
*/
/*ARGSUSED*/
static void acf_pulse(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
if (!skip)
error(bDEBUG,"%s: pulse not supported in ac analysis\n",brh->printlabel());
*arg += aPULSE;
}
/*--------------------------------------------------------------------------*/
/* acf_pwl: spice compatible function: pwl
* "piece-wise linear" point-plotting function of time.
* no-op in ac analysis, with a complaint
* arg0 = arg count
* no other args matter
*/
/*ARGSUSED*/
static void acf_pwl(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
if (!skip)
error(bDEBUG,"%s: pwl not supported in ac analysis\n",brh->printlabel());
*arg += (int)arg0;
}
/*--------------------------------------------------------------------------*/
/* acf_sffm: spice compatible function: sffm
* single frequency frequency modulation
* no-op in ac analysis, with a complaint
* arg0 = dc offset
* arg1 = amplitude
* arg2 = carrier freq
* arg3 = mod index
* arg4 = signal freq
*/
/*ARGSUSED*/
static void acf_sffm(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
if (!skip)
error(bDEBUG,"%s: sffm not supported in ac analysis\n",brh->printlabel());
*arg += aSFFM;
}
/*--------------------------------------------------------------------------*/
/* acf_sin: spice compatible function: sin
* sinusoidal function, mainly for sources
* no-op in ac analysis, with a complaint
* arg0 = offset
* arg1 = amplitude
* arg2 = frequency
* arg3 = delay
* arg4 = damping
*/
/*ARGSUSED*/
static void acf_sin(const COMPONENT* brh, double **arg, COMPLEX* /*y*/)
{
if (!skip)
error(bDEBUG,"%s: sin not supported in ac analysis\n",brh->printlabel());
*arg += aSIN;
}
/*--------------------------------------------------------------------------*/
/* acf_tanh: function: tanh
* for now, a copy of max
* piecewise linear function: block that clips
* bad design: should be keyword, so it can apply to the total part
* should be able to specify upper and lower limits
* arg0 = normal value
* arg1 = output clip pt
*/
static void acf_tanh(const COMPONENT* /*brh*/, double **arg, COMPLEX* y)
{
if (!skip){
if (arg1 != 0.){
double cosine;
cosine = cosh(bias * arg0/arg1);
*y += arg0 / (cosine*cosine);
}
/* else 0 */
}
*arg += aTANH;
}
/*--------------------------------------------------------------------------*/
/*ARGSUSED*/
static void acf_ic(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
*arg += 1;
}
/*--------------------------------------------------------------------------*/
/*ARGSUSED*/
static void acf_ii(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
*arg += 1;
}
/*--------------------------------------------------------------------------*/
/*ARGSUSED*/
static void acf_iv(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
*arg += 1;
}
/*--------------------------------------------------------------------------*/
/*ARGSUSED*/
static void acf_tempco(const COMPONENT* /*brh*/, double **arg, COMPLEX* /*y*/)
{
#ifdef NEVER
tempco = arg0;
#endif
*arg += 1;
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
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