mos9load.c

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                if(((ckt->CKTmode & (MODEINITPRED | MODEINITTRAN) ) ||
                        fabs(delvbd) >= ckt->CKTreltol * MAX(fabs(vbd),
                        fabs(*(ckt->CKTstate0+here->MOS9vbd)))+
                        ckt->CKTvoltTol)|| senflag )
#endif /*CAPBYPASS*/
                    /* can't bypass the diode capacitance calculations */
                {
#ifdef CAPZEROBYPASS
                    if(here->MOS9Cbd != 0 || here->MOS9Cbdsw != 0 ) {
#endif /*CAPZEROBYPASS*/
                    if (vbd < here->MOS9tDepCap) {
                        arg=1-vbd/here->MOS9tBulkPot;
                        /*
                         * the following block looks somewhat long and messy,
                         * but since most users use the default grading
                         * coefficients of .5, and sqrt is MUCH faster than an
                         * exp(log()) we use this special case code to buy time.
                         * (as much as 10% of total job time!)
                         */
#ifndef NOSQRT
                        if(model->MOS9bulkJctBotGradingCoeff == .5 &&
                                model->MOS9bulkJctSideGradingCoeff == .5) {
                            sarg = sargsw = 1/sqrt(arg);
                        } else {
                            if(model->MOS9bulkJctBotGradingCoeff == .5) {
                                sarg = 1/sqrt(arg);
                            } else {
#endif /*NOSQRT*/
                                sarg = exp(-model->MOS9bulkJctBotGradingCoeff*
                                        log(arg));
#ifndef NOSQRT
                            }
                            if(model->MOS9bulkJctSideGradingCoeff == .5) {
                                sargsw = 1/sqrt(arg);
                            } else {
#endif /*NOSQRT*/
                                sargsw =exp(-model->MOS9bulkJctSideGradingCoeff*
                                        log(arg));
#ifndef NOSQRT
                            }
                        }
#endif /*NOSQRT*/
                        *(ckt->CKTstate0 + here->MOS9qbd) =
                            here->MOS9tBulkPot*(here->MOS9Cbd*
                            (1-arg*sarg)
                            /(1-model->MOS9bulkJctBotGradingCoeff)
                            +here->MOS9Cbdsw*
                            (1-arg*sargsw)
                            /(1-model->MOS9bulkJctSideGradingCoeff));
                        here->MOS9capbd=here->MOS9Cbd*sarg+
                                here->MOS9Cbdsw*sargsw;
                    } else {
                        *(ckt->CKTstate0 + here->MOS9qbd) = here->MOS9f4d +
                                vbd * (here->MOS9f2d + vbd * here->MOS9f3d/2);
                        here->MOS9capbd=here->MOS9f2d + vbd * here->MOS9f3d;
                    }
#ifdef CAPZEROBYPASS
                } else {
                    *(ckt->CKTstate0 + here->MOS9qbd) = 0;
                    here->MOS9capbd = 0;
                }
#endif /*CAPZEROBYPASS*/
                }

                if(SenCond && (ckt->CKTsenInfo->SENmode==TRANSEN)) goto next2;

                if ( ckt->CKTmode & MODETRAN ) {
                    /* (above only excludes tranop, since we're only at this
                     * point if tran or tranop )
                     */

                    /*
                     *    calculate equivalent conductances and currents for
                     *    depletion capacitors
                     */

                    /* integrate the capacitors and save results */

                    error = NIintegrate(ckt,&geq,&ceq,here->MOS9capbd,
                            here->MOS9qbd);
                    if(error) return(error);
                    here->MOS9gbd += geq;
                    here->MOS9cbd += *(ckt->CKTstate0 + here->MOS9cqbd);
                    here->MOS9cd -= *(ckt->CKTstate0 + here->MOS9cqbd);
                    error = NIintegrate(ckt,&geq,&ceq,here->MOS9capbs,
                            here->MOS9qbs);
                    if(error) return(error);
                    here->MOS9gbs += geq;
                    here->MOS9cbs += *(ckt->CKTstate0 + here->MOS9cqbs);
                }
            }

            if(SenCond) goto next2;

            /*
             *  check convergence
             */
            if ( (here->MOS9off == 0)  || 
                    (!(ckt->CKTmode & (MODEINITFIX|MODEINITSMSIG))) ){
                if (Check == 1) {
                    ckt->CKTnoncon++;
		    ckt->CKTtroubleElt = (GENinstance *) here;
                }
            }



            /* save things away for next time */

next2:      *(ckt->CKTstate0 + here->MOS9vbs) = vbs;
            *(ckt->CKTstate0 + here->MOS9vbd) = vbd;
            *(ckt->CKTstate0 + here->MOS9vgs) = vgs;
            *(ckt->CKTstate0 + here->MOS9vds) = vds;



            /*
             *     meyer's capacitor model
             */
            if ( ckt->CKTmode & (MODETRAN | MODETRANOP | MODEINITSMSIG) ) {
                /*
                 *     calculate meyer's capacitors
                 */
                /* 
                 * new cmeyer - this just evaluates at the current time,
                 * expects you to remember values from previous time
                 * returns 1/2 of non-constant portion of capacitance
                 * you must add in the other half from previous time
                 * and the constant part
                 */
                if (here->MOS9mode > 0){
                    DEVqmeyer (vgs,vgd,vgb,von,vdsat,
                        (ckt->CKTstate0 + here->MOS9capgs),
                        (ckt->CKTstate0 + here->MOS9capgd),
                        (ckt->CKTstate0 + here->MOS9capgb),
                        here->MOS9tPhi,OxideCap);
                } else {
                    DEVqmeyer (vgd,vgs,vgb,von,vdsat,
                        (ckt->CKTstate0 + here->MOS9capgd),
                        (ckt->CKTstate0 + here->MOS9capgs),
                        (ckt->CKTstate0 + here->MOS9capgb),
                        here->MOS9tPhi,OxideCap);
                }
                vgs1 = *(ckt->CKTstate1 + here->MOS9vgs);
                vgd1 = vgs1 - *(ckt->CKTstate1 + here->MOS9vds);
                vgb1 = vgs1 - *(ckt->CKTstate1 + here->MOS9vbs);
                if(ckt->CKTmode & MODETRANOP) {
                    capgs =  2 * *(ckt->CKTstate0+here->MOS9capgs)+ 
                              GateSourceOverlapCap ;
                    capgd =  2 * *(ckt->CKTstate0+here->MOS9capgd)+ 
                              GateDrainOverlapCap ;
                    capgb =  2 * *(ckt->CKTstate0+here->MOS9capgb)+ 
                              GateBulkOverlapCap ;
                } else {
                    capgs = ( *(ckt->CKTstate0+here->MOS9capgs)+ 
                              *(ckt->CKTstate1+here->MOS9capgs) +
                              GateSourceOverlapCap );
                    capgd = ( *(ckt->CKTstate0+here->MOS9capgd)+ 
                              *(ckt->CKTstate1+here->MOS9capgd) +
                              GateDrainOverlapCap );
                    capgb = ( *(ckt->CKTstate0+here->MOS9capgb)+ 
                              *(ckt->CKTstate1+here->MOS9capgb) +
                              GateBulkOverlapCap );
                }
                if(ckt->CKTsenInfo){
                    here->MOS9cgs = capgs;
                    here->MOS9cgd = capgd;
                    here->MOS9cgb = capgb;
                }


                /*
                 *     store small-signal parameters (for meyer's model)
                 *  all parameters already stored, so done...
                 */


                if(SenCond){
                    if(ckt->CKTsenInfo->SENmode & (DCSEN|ACSEN)) {
                        continue;
                    }
                }
#ifndef PREDICTOR
                if (ckt->CKTmode & (MODEINITPRED | MODEINITTRAN) ) {
                    *(ckt->CKTstate0 + here->MOS9qgs) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS9qgs)
                        - xfact * *(ckt->CKTstate2 + here->MOS9qgs);
                    *(ckt->CKTstate0 + here->MOS9qgd) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS9qgd)
                        - xfact * *(ckt->CKTstate2 + here->MOS9qgd);
                    *(ckt->CKTstate0 + here->MOS9qgb) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS9qgb)
                        - xfact * *(ckt->CKTstate2 + here->MOS9qgb);
                } else {
#endif /*PREDICTOR*/
                    if(ckt->CKTmode & MODETRAN) {
                        *(ckt->CKTstate0 + here->MOS9qgs) = (vgs-vgs1)*capgs +
                            *(ckt->CKTstate1 + here->MOS9qgs) ;
                        *(ckt->CKTstate0 + here->MOS9qgd) = (vgd-vgd1)*capgd +
                            *(ckt->CKTstate1 + here->MOS9qgd) ;
                        *(ckt->CKTstate0 + here->MOS9qgb) = (vgb-vgb1)*capgb +
                            *(ckt->CKTstate1 + here->MOS9qgb) ;
                    } else {
                        /* TRANOP only */
                        *(ckt->CKTstate0 + here->MOS9qgs) = vgs*capgs;
                        *(ckt->CKTstate0 + here->MOS9qgd) = vgd*capgd;
                        *(ckt->CKTstate0 + here->MOS9qgb) = vgb*capgb;
                    }
#ifndef PREDICTOR
                }
#endif /*PREDICTOR*/
            }
bypass:
            if(SenCond) continue;


            if ( (ckt->CKTmode & (MODEINITTRAN)) || 
                    (! (ckt->CKTmode & (MODETRAN)) )  ) {
                /*
                 *  initialize to zero charge conductances 
                 *  and current
                 */
                gcgs=0;
                ceqgs=0;
                gcgd=0;
                ceqgd=0;
                gcgb=0;
                ceqgb=0;
            } else {
                if(capgs == 0) *(ckt->CKTstate0 + here->MOS9cqgs) =0;
                if(capgd == 0) *(ckt->CKTstate0 + here->MOS9cqgd) =0;
                if(capgb == 0) *(ckt->CKTstate0 + here->MOS9cqgb) =0;
                /*
                 *    calculate equivalent conductances and currents for
                 *    meyer"s capacitors
                 */
                error = NIintegrate(ckt,&gcgs,&ceqgs,capgs,here->MOS9qgs);
                if(error) return(error);
                error = NIintegrate(ckt,&gcgd,&ceqgd,capgd,here->MOS9qgd);
                if(error) return(error);
                error = NIintegrate(ckt,&gcgb,&ceqgb,capgb,here->MOS9qgb);
                if(error) return(error);
                ceqgs=ceqgs-gcgs*vgs+ckt->CKTag[0]* 
                        *(ckt->CKTstate0 + here->MOS9qgs);
                ceqgd=ceqgd-gcgd*vgd+ckt->CKTag[0]*
                        *(ckt->CKTstate0 + here->MOS9qgd);
                ceqgb=ceqgb-gcgb*vgb+ckt->CKTag[0]*
                        *(ckt->CKTstate0 + here->MOS9qgb);
            }
            /*
             *     store charge storage info for meyer's cap in lx table
             */


            /*
             *  load current vector
             */
            ceqbs = model->MOS9type * 
                    (here->MOS9cbs-(here->MOS9gbs)*vbs);
            ceqbd = model->MOS9type * 
                    (here->MOS9cbd-(here->MOS9gbd)*vbd);
            if (here->MOS9mode >= 0) {
                xnrm=1;
                xrev=0;
                cdreq=model->MOS9type*(cdrain-here->MOS9gds*vds-
                        here->MOS9gm*vgs-here->MOS9gmbs*vbs);
            } else {
                xnrm=0;
                xrev=1;
                cdreq = -(model->MOS9type)*(cdrain-here->MOS9gds*(-vds)-
                        here->MOS9gm*vgd-here->MOS9gmbs*vbd);
            }
            *(ckt->CKTrhs + here->MOS9gNode) -= 
                (model->MOS9type * (ceqgs + ceqgb + ceqgd));
            *(ckt->CKTrhs + here->MOS9bNode) -=
                (ceqbs + ceqbd - model->MOS9type * ceqgb);
            *(ckt->CKTrhs + here->MOS9dNodePrime) +=
                    (ceqbd - cdreq + model->MOS9type * ceqgd);
            *(ckt->CKTrhs + here->MOS9sNodePrime) += 
                    cdreq + ceqbs + model->MOS9type * ceqgs;
            /*
             *  load y matrix
             */
/*printf(" loading %s at time %g\n",here->MOS9name,ckt->CKTtime);*/
/*printf("%g %g %g %g %g\n", here->MOS9drainConductance,gcgd+gcgs+gcgb,
        here->MOS9sourceConductance,here->MOS9gbd,here->MOS9gbs);*/
/*printf("%g %g %g %g %g\n",-gcgb,0.0,0.0,here->MOS9gds,here->MOS9gm);*/
/*printf("%g %g %g %g %g\n", here->MOS9gds,here->MOS9gmbs,gcgd,-gcgs,-gcgd);*/
/*printf("%g %g %g %g %g\n", -gcgs,-gcgd,0.0,-gcgs,0.0);*/

            *(here->MOS9DdPtr) += (here->MOS9drainConductance);
            *(here->MOS9GgPtr) += ((gcgd+gcgs+gcgb));
            *(here->MOS9SsPtr) += (here->MOS9sourceConductance);
            *(here->MOS9BbPtr) += (here->MOS9gbd+here->MOS9gbs+gcgb);
            *(here->MOS9DPdpPtr) += 
                (here->MOS9drainConductance+here->MOS9gds+
                here->MOS9gbd+xrev*(here->MOS9gm+here->MOS9gmbs)+gcgd);
            *(here->MOS9SPspPtr) += 
                (here->MOS9sourceConductance+here->MOS9gds+
                here->MOS9gbs+xnrm*(here->MOS9gm+here->MOS9gmbs)+gcgs);
            *(here->MOS9DdpPtr) += (-here->MOS9drainConductance);
            *(here->MOS9GbPtr) -= gcgb;
            *(here->MOS9GdpPtr) -= gcgd;
            *(here->MOS9GspPtr) -= gcgs;
            *(here->MOS9SspPtr) += (-here->MOS9sourceConductance);
            *(here->MOS9BgPtr) -= gcgb;
            *(here->MOS9BdpPtr) -= here->MOS9gbd;
            *(here->MOS9BspPtr) -= here->MOS9gbs;
            *(here->MOS9DPdPtr) += (-here->MOS9drainConductance);
            *(here->MOS9DPgPtr) += ((xnrm-xrev)*here->MOS9gm-gcgd);
            *(here->MOS9DPbPtr) += (-here->MOS9gbd+(xnrm-xrev)*here->MOS9gmbs);
            *(here->MOS9DPspPtr) += (-here->MOS9gds-
                    xnrm*(here->MOS9gm+here->MOS9gmbs));
            *(here->MOS9SPgPtr) += (-(xnrm-xrev)*here->MOS9gm-gcgs);
            *(here->MOS9SPsPtr) += (-here->MOS9sourceConductance);
            *(here->MOS9SPbPtr) += (-here->MOS9gbs-(xnrm-xrev)*here->MOS9gmbs);
            *(here->MOS9SPdpPtr) += (-here->MOS9gds-
                    xrev*(here->MOS9gm+here->MOS9gmbs));
        }
    }
    return(OK);
}