mos9load.c

ngspice又一个电子CAD仿真软件代码.功能更全

/**********
Copyright 1990 Regents of the University of California.  All rights reserved.
Author: 1985 Thomas L. Quarles
Modified: Alan Gillespie
**********/

#include "ngspice.h"
#include "cktdefs.h"
#include "devdefs.h"
#include "mos9defs.h"
#include "trandefs.h"
#include "const.h"
#include "sperror.h"
#include "suffix.h"

int
MOS9load(GENmodel *inModel, CKTcircuit *ckt)
        /* actually load the current value into the 
         * sparse matrix previously provided 
         */
{
    MOS9model *model = (MOS9model *)inModel;
    MOS9instance *here;
    double Beta;
    double DrainSatCur;
    double EffectiveLength;
    double EffectiveWidth;
    double GateBulkOverlapCap;
    double GateDrainOverlapCap;
    double GateSourceOverlapCap;
    double OxideCap;
    double SourceSatCur;
    double arg;
    double cbhat;
    double cdhat;
    double cdrain;
    double cdreq;
    double ceq;
    double ceqbd;
    double ceqbs;
    double ceqgb;
    double ceqgd;
    double ceqgs;
    double delvbd;
    double delvbs;
    double delvds;
    double delvgd;
    double delvgs;
    double evbd;
    double evbs;
    double gcgb;
    double gcgd;
    double gcgs;
    double geq;
    double sarg;
    double sargsw;
    double vbd;
    double vbs;
    double vds;
    double vdsat;
    double vgb1;
    double vgb;
    double vgd1;
    double vgd;
    double vgdo;
    double vgs1;
    double vgs;
    double von;
    double xfact = 0.0;
    int xnrm;
    int xrev;
    double capgs = 0.0;   /* total gate-source capacitance */
    double capgd = 0.0;   /* total gate-drain capacitance */
    double capgb = 0.0;   /* total gate-bulk capacitance */
    int Check;
#ifndef NOBYPASS      
    double tempv;
#endif /*NOBYPASS*/    
    int error;
#ifdef CAPBYPASS
    int senflag;
#endif /* CAPBYPASS */
    int SenCond;
    double vt;  /* vt at instance temperature */


#ifdef CAPBYPASS
    senflag = 0;
#endif /* CAPBYPASS */
    if(ckt->CKTsenInfo){
        if(ckt->CKTsenInfo->SENstatus == PERTURBATION) {
            if((ckt->CKTsenInfo->SENmode == ACSEN)||
                (ckt->CKTsenInfo->SENmode == TRANSEN)){
#ifdef CAPBYPASS
                senflag = 1;
#endif /* CAPBYPASS */
            }
            goto next;
        }
    }

    /*  loop through all the MOS9 device models */
next: 
    for( ; model != NULL; model = model->MOS9nextModel ) {

        /* loop through all the instances of the model */
        for (here = model->MOS9instances; here != NULL ;
                here=here->MOS9nextInstance) {
            if (here->MOS9owner != ARCHme) continue;

            vt = CONSTKoverQ * here->MOS9temp;
            Check=1;

            if(ckt->CKTsenInfo){
#ifdef SENSDEBUG
                printf("MOS9load \n");
#endif /* SENSDEBUG */

                if(ckt->CKTsenInfo->SENstatus == PERTURBATION)
                    if(here->MOS9senPertFlag == OFF)continue;

            }
            SenCond = ckt->CKTsenInfo && here->MOS9senPertFlag;

            /* first, we compute a few useful values - these could be
             * pre-computed, but for historical reasons are still done
             * here.  They may be moved at the expense of instance size
             */

            EffectiveWidth=here->MOS9w-2*model->MOS9widthNarrow+
                                                    model->MOS9widthAdjust;
            EffectiveLength=here->MOS9l - 2*model->MOS9latDiff+
                                                    model->MOS9lengthAdjust;

            if( (here->MOS9tSatCurDens == 0) || 
                    (here->MOS9drainArea == 0) ||
                    (here->MOS9sourceArea == 0)) {
                DrainSatCur = here->MOS9m * here->MOS9tSatCur;
                SourceSatCur = here->MOS9m * here->MOS9tSatCur;
            } else {
                DrainSatCur = here->MOS9m * here->MOS9tSatCurDens * 
                        here->MOS9drainArea;
                SourceSatCur = here->MOS9m * here->MOS9tSatCurDens * 
                        here->MOS9sourceArea;
            }
            GateSourceOverlapCap = model->MOS9gateSourceOverlapCapFactor * 
                    here->MOS9m * EffectiveWidth;
            GateDrainOverlapCap = model->MOS9gateDrainOverlapCapFactor * 
                    here->MOS9m * EffectiveWidth;
            GateBulkOverlapCap = model->MOS9gateBulkOverlapCapFactor * 
                    here->MOS9m * EffectiveLength;
            Beta = here->MOS9tTransconductance *
                    here->MOS9m * EffectiveWidth/EffectiveLength;
            OxideCap = model->MOS9oxideCapFactor * EffectiveLength * 
                    here->MOS9m * EffectiveWidth;


            if(SenCond){
#ifdef SENSDEBUG
                printf("MOS9senPertFlag = ON \n");
#endif /* SENSDEBUG */
                if((ckt->CKTsenInfo->SENmode == TRANSEN) &&
                (ckt->CKTmode & MODEINITTRAN)) {
                    vgs = *(ckt->CKTstate1 + here->MOS9vgs);
                    vds = *(ckt->CKTstate1 + here->MOS9vds);
                    vbs = *(ckt->CKTstate1 + here->MOS9vbs);
                    vbd = *(ckt->CKTstate1 + here->MOS9vbd);
                    vgb = vgs - vbs;
                    vgd = vgs - vds;
                }
                else if (ckt->CKTsenInfo->SENmode == ACSEN){
                    vgb = model->MOS9type * ( 
                        *(ckt->CKTrhsOp+here->MOS9gNode) -
                        *(ckt->CKTrhsOp+here->MOS9bNode));
                    vbs = *(ckt->CKTstate0 + here->MOS9vbs);
                    vbd = *(ckt->CKTstate0 + here->MOS9vbd);
                    vgd = vgb + vbd ;
                    vgs = vgb + vbs ;
                    vds = vbs - vbd ;
                }
                else{
                    vgs = *(ckt->CKTstate0 + here->MOS9vgs);
                    vds = *(ckt->CKTstate0 + here->MOS9vds);
                    vbs = *(ckt->CKTstate0 + here->MOS9vbs);
                    vbd = *(ckt->CKTstate0 + here->MOS9vbd);
                    vgb = vgs - vbs;
                    vgd = vgs - vds;
                }
#ifdef SENSDEBUG
                printf(" vbs = %.7e ,vbd = %.7e,vgb = %.7e\n",vbs,vbd,vgb);
                printf(" vgs = %.7e ,vds = %.7e,vgd = %.7e\n",vgs,vds,vgd);
#endif /* SENSDEBUG */
                goto next1;
            }


            /* 
             * ok - now to do the start-up operations
             *
             * we must get values for vbs, vds, and vgs from somewhere
             * so we either predict them or recover them from last iteration
             * These are the two most common cases - either a prediction
             * step or the general iteration step and they
             * share some code, so we put them first - others later on
             */

            if((ckt->CKTmode & (MODEINITFLOAT | MODEINITPRED | MODEINITSMSIG | 
                    MODEINITTRAN)) ||
                    ( (ckt->CKTmode & MODEINITFIX) && (!here->MOS9off) )  ) {
#ifndef PREDICTOR
                if(ckt->CKTmode & (MODEINITPRED | MODEINITTRAN) ) {

                    /* predictor step */

                    xfact=ckt->CKTdelta/ckt->CKTdeltaOld[1];
                    *(ckt->CKTstate0 + here->MOS9vbs) = 
                            *(ckt->CKTstate1 + here->MOS9vbs);
                    vbs = (1+xfact)* (*(ckt->CKTstate1 + here->MOS9vbs))
                            -(xfact * (*(ckt->CKTstate2 + here->MOS9vbs)));
                    *(ckt->CKTstate0 + here->MOS9vgs) = 
                            *(ckt->CKTstate1 + here->MOS9vgs);
                    vgs = (1+xfact)* (*(ckt->CKTstate1 + here->MOS9vgs))
                            -(xfact * (*(ckt->CKTstate2 + here->MOS9vgs)));
                    *(ckt->CKTstate0 + here->MOS9vds) = 
                            *(ckt->CKTstate1 + here->MOS9vds);
                    vds = (1+xfact)* (*(ckt->CKTstate1 + here->MOS9vds))
                            -(xfact * (*(ckt->CKTstate2 + here->MOS9vds)));
                    *(ckt->CKTstate0 + here->MOS9vbd) = 
                            *(ckt->CKTstate0 + here->MOS9vbs)-
                            *(ckt->CKTstate0 + here->MOS9vds);
                } else {
#endif /*PREDICTOR*/

                    /* general iteration */

                    vbs = model->MOS9type * ( 
                        *(ckt->CKTrhsOld+here->MOS9bNode) -
                        *(ckt->CKTrhsOld+here->MOS9sNodePrime));
                    vgs = model->MOS9type * ( 
                        *(ckt->CKTrhsOld+here->MOS9gNode) -
                        *(ckt->CKTrhsOld+here->MOS9sNodePrime));
                    vds = model->MOS9type * ( 
                        *(ckt->CKTrhsOld+here->MOS9dNodePrime) -
                        *(ckt->CKTrhsOld+here->MOS9sNodePrime));
#ifndef PREDICTOR
                }
#endif /*PREDICTOR*/

                /* now some common crunching for some more useful quantities */

                vbd=vbs-vds;
                vgd=vgs-vds;
                vgdo = *(ckt->CKTstate0 + here->MOS9vgs) - 
                        *(ckt->CKTstate0 + here->MOS9vds);
                delvbs = vbs - *(ckt->CKTstate0 + here->MOS9vbs);
                delvbd = vbd - *(ckt->CKTstate0 + here->MOS9vbd);
                delvgs = vgs - *(ckt->CKTstate0 + here->MOS9vgs);
                delvds = vds - *(ckt->CKTstate0 + here->MOS9vds);
                delvgd = vgd-vgdo;

                /* these are needed for convergence testing */

                if (here->MOS9mode >= 0) {
                    cdhat=
                        here->MOS9cd-
                        here->MOS9gbd * delvbd +
                        here->MOS9gmbs * delvbs +
                        here->MOS9gm * delvgs + 
                        here->MOS9gds * delvds ;
                } else {
                    cdhat=
                        here->MOS9cd -
                        ( here->MOS9gbd -
                        here->MOS9gmbs) * delvbd -
                        here->MOS9gm * delvgd + 
                        here->MOS9gds * delvds ;
                }
                cbhat=
                    here->MOS9cbs +
                    here->MOS9cbd +
                    here->MOS9gbd * delvbd +
                    here->MOS9gbs * delvbs ;
#ifndef NOBYPASS
                /* now lets see if we can bypass (ugh) */
                /* the following mess should be one if statement, but
                 * many compilers can't handle it all at once, so it
                 * is split into several successive if statements
                 */
                tempv = MAX(fabs(cbhat),fabs(here->MOS9cbs
                        + here->MOS9cbd))+ckt->CKTabstol;
                if((!(ckt->CKTmode & (MODEINITPRED|MODEINITTRAN|MODEINITSMSIG)
                        )) && (ckt->CKTbypass) )
                if ( (fabs(cbhat-(here->MOS9cbs + 
                        here->MOS9cbd)) < ckt->CKTreltol * 
                        tempv)) 
                if( (fabs(delvbs) < (ckt->CKTreltol * MAX(fabs(vbs),
                        fabs(*(ckt->CKTstate0+here->MOS9vbs)))+
                        ckt->CKTvoltTol)))
                if ( (fabs(delvbd) < (ckt->CKTreltol * MAX(fabs(vbd),
                        fabs(*(ckt->CKTstate0+here->MOS9vbd)))+
                        ckt->CKTvoltTol)) )
                if( (fabs(delvgs) < (ckt->CKTreltol * MAX(fabs(vgs),
                        fabs(*(ckt->CKTstate0+here->MOS9vgs)))+
                        ckt->CKTvoltTol)))
                if ( (fabs(delvds) < (ckt->CKTreltol * MAX(fabs(vds),
                        fabs(*(ckt->CKTstate0+here->MOS9vds)))+
                        ckt->CKTvoltTol)) )
                if( (fabs(cdhat- here->MOS9cd) <
                        ckt->CKTreltol * MAX(fabs(cdhat),fabs(
                        here->MOS9cd)) + ckt->CKTabstol) ) {
                    /* bypass code *
                     * nothing interesting has changed since last
                     * iteration on this device, so we just
                     * copy all the values computed last iteration out
                     * and keep going
                     */
                    vbs = *(ckt->CKTstate0 + here->MOS9vbs);
                    vbd = *(ckt->CKTstate0 + here->MOS9vbd);
                    vgs = *(ckt->CKTstate0 + here->MOS9vgs);
                    vds = *(ckt->CKTstate0 + here->MOS9vds);
                    vgd = vgs - vds;
                    vgb = vgs - vbs;
                    cdrain = here->MOS9mode * (here->MOS9cd + here->MOS9cbd);
                    if(ckt->CKTmode & (MODETRAN | MODETRANOP)) {
                        capgs = ( *(ckt->CKTstate0+here->MOS9capgs)+ 
                                  *(ckt->CKTstate1+here->MOS9capgs) +