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6.7 KiB

/**********
Copyright 1990 Regents of the University of California. All rights reserved.
Author: 1987 Gary W. Ng
Modified: 2000 AlansFixes
**********/
#include "ngspice.h"
#include "mos3defs.h"
#include "cktdefs.h"
#include "iferrmsg.h"
#include "noisedef.h"
#include "suffix.h"
/*
* MOS3noise (mode, operation, firstModel, ckt, data, OnDens)
* This routine names and evaluates all of the noise sources
* associated with MOSFET's. It starts with the model *firstModel and
* traverses all of its insts. It then proceeds to any other models
* on the linked list. The total output noise density generated by
* all of the MOSFET's is summed with the variable "OnDens".
*/
extern void NevalSrc (double *noise, double *lnNoise, CKTcircuit *ckt, int type, int node1, int node2, double param);
extern double Nintegrate (double noizDens, double lnNdens, double lnNlstDens, Ndata *data);
int
MOS3noise (int mode, int operation, GENmodel *genmodel, CKTcircuit *ckt,
Ndata *data, double *OnDens)
{
MOS3model *firstModel = (MOS3model *) genmodel;
MOS3model *model;
MOS3instance *inst;
char name[N_MXVLNTH];
double tempOnoise;
double tempInoise;
double noizDens[MOS3NSRCS];
double lnNdens[MOS3NSRCS];
int i;
/* define the names of the noise sources */
static char *MOS3nNames[MOS3NSRCS] = { /* Note that we have to keep the order */
"_rd", /* noise due to rd */ /* consistent with thestrchr definitions */
"_rs", /* noise due to rs */ /* in MOS3defs.h */
"_id", /* noise due to id */
"_1overf", /* flicker (1/f) noise */
"" /* total transistor noise */
};
for (model=firstModel; model != NULL; model=model->MOS3nextModel) {
for (inst=model->MOS3instances; inst != NULL; inst=inst->MOS3nextInstance) {
if (inst->MOS3owner != ARCHme) continue;
switch (operation) {
case N_OPEN:
/* see if we have to to produce a summary report */
/* if so, name all the noise generators */
if (((NOISEAN*)ckt->CKTcurJob)->NStpsSm != 0) {
switch (mode) {
case N_DENS:
for (i=0; i < MOS3NSRCS; i++) {
(void)sprintf(name,"onoise_%s%s",inst->MOS3name,MOS3nNames[i]);
data->namelist = (IFuid *)trealloc((char *)data->namelist,(data->numPlots + 1)*sizeof(IFuid));
if (!data->namelist) return(E_NOMEM);
(*(SPfrontEnd->IFnewUid))(ckt,
&(data->namelist[data->numPlots++]),
(IFuid)NULL,name,UID_OTHER,(void **)NULL);
/* we've added one more plot */
}
break;
case INT_NOIZ:
for (i=0; i < MOS3NSRCS; i++) {
(void)sprintf(name,"onoise_total_%s%s",inst->MOS3name,MOS3nNames[i]);
data->namelist = (IFuid *)trealloc((char *)data->namelist,(data->numPlots + 1)*sizeof(IFuid));
if (!data->namelist) return(E_NOMEM);
(*(SPfrontEnd->IFnewUid))(ckt,
&(data->namelist[data->numPlots++]),
(IFuid)NULL,name,UID_OTHER,(void **)NULL);
/* we've added one more plot */
(void)sprintf(name,"inoise_total_%s%s",inst->MOS3name,MOS3nNames[i]);
data->namelist = (IFuid *)trealloc((char *)data->namelist,(data->numPlots + 1)*sizeof(IFuid));
if (!data->namelist) return(E_NOMEM);
(*(SPfrontEnd->IFnewUid))(ckt,
&(data->namelist[data->numPlots++]),
(IFuid)NULL,name,UID_OTHER,(void **)NULL);
/* we've added one more plot */
}
break;
}
}
break;
case N_CALC:
switch (mode) {
case N_DENS:
NevalSrc(&noizDens[MOS3RDNOIZ],&lnNdens[MOS3RDNOIZ],
ckt,THERMNOISE,inst->MOS3dNodePrime,inst->MOS3dNode,
inst->MOS3drainConductance);
NevalSrc(&noizDens[MOS3RSNOIZ],&lnNdens[MOS3RSNOIZ],
ckt,THERMNOISE,inst->MOS3sNodePrime,inst->MOS3sNode,
inst->MOS3sourceConductance);
NevalSrc(&noizDens[MOS3IDNOIZ],&lnNdens[MOS3IDNOIZ],
ckt,THERMNOISE,inst->MOS3dNodePrime,inst->MOS3sNodePrime,
(2.0/3.0 * fabs(inst->MOS3gm)));
NevalSrc(&noizDens[MOS3FLNOIZ],(double*)NULL,ckt,
N_GAIN,inst->MOS3dNodePrime, inst->MOS3sNodePrime,
(double)0.0);
noizDens[MOS3FLNOIZ] *= model->MOS3fNcoef *
exp(model->MOS3fNexp *
log(MAX(fabs(inst->MOS3cd),N_MINLOG))) /
(data->freq *
(inst->MOS3w - 2*model->MOS3widthNarrow) *
(inst->MOS3l - 2*model->MOS3latDiff) *
model->MOS3oxideCapFactor * model->MOS3oxideCapFactor);
lnNdens[MOS3FLNOIZ] =
log(MAX(noizDens[MOS3FLNOIZ],N_MINLOG));
noizDens[MOS3TOTNOIZ] = noizDens[MOS3RDNOIZ] +
noizDens[MOS3RSNOIZ] +
noizDens[MOS3IDNOIZ] +
noizDens[MOS3FLNOIZ];
lnNdens[MOS3TOTNOIZ] =
log(MAX(noizDens[MOS3TOTNOIZ], N_MINLOG));
*OnDens += noizDens[MOS3TOTNOIZ];
if (data->delFreq == 0.0) {
/* if we haven't done any previous integration, we need to */
/* initialize our "history" variables */
for (i=0; i < MOS3NSRCS; i++) {
inst->MOS3nVar[LNLSTDENS][i] = lnNdens[i];
}
/* clear out our integration variables if it's the first pass */
if (data->freq == ((NOISEAN*)ckt->CKTcurJob)->NstartFreq) {
for (i=0; i < MOS3NSRCS; i++) {
inst->MOS3nVar[OUTNOIZ][i] = 0.0;
inst->MOS3nVar[INNOIZ][i] = 0.0;
}
}
} else { /* data->delFreq != 0.0 (we have to integrate) */
for (i=0; i < MOS3NSRCS; i++) {
if (i != MOS3TOTNOIZ) {
tempOnoise = Nintegrate(noizDens[i], lnNdens[i],
inst->MOS3nVar[LNLSTDENS][i], data);
tempInoise = Nintegrate(noizDens[i] * data->GainSqInv ,
lnNdens[i] + data->lnGainInv,
inst->MOS3nVar[LNLSTDENS][i] + data->lnGainInv,
data);
inst->MOS3nVar[LNLSTDENS][i] = lnNdens[i];
data->outNoiz += tempOnoise;
data->inNoise += tempInoise;
if (((NOISEAN*)ckt->CKTcurJob)->NStpsSm != 0) {
inst->MOS3nVar[OUTNOIZ][i] += tempOnoise;
inst->MOS3nVar[OUTNOIZ][MOS3TOTNOIZ] += tempOnoise;
inst->MOS3nVar[INNOIZ][i] += tempInoise;
inst->MOS3nVar[INNOIZ][MOS3TOTNOIZ] += tempInoise;
}
}
}
}
if (data->prtSummary) {
for (i=0; i < MOS3NSRCS; i++) { /* print a summary report */
data->outpVector[data->outNumber++] = noizDens[i];
}
}
break;
case INT_NOIZ: /* already calculated, just output */
if (((NOISEAN*)ckt->CKTcurJob)->NStpsSm != 0) {
for (i=0; i < MOS3NSRCS; i++) {
data->outpVector[data->outNumber++] = inst->MOS3nVar[OUTNOIZ][i];
data->outpVector[data->outNumber++] = inst->MOS3nVar[INNOIZ][i];
}
} /* if */
break;
} /* switch (mode) */
break;
case N_CLOSE:
return (OK); /* do nothing, the main calling routine will close */
break; /* the plots */
} /* switch (operation) */
} /* for inst */
} /* for model */
return(OK);
}