mos6load.c

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#endif /*CAPZEROBYPASS*/
                    if (vbd < here->MOS6tDepCap) {
                        arg=1-vbd/here->MOS6tBulkPot;
                        /*
                         * 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->MOS6bulkJctBotGradingCoeff == .5 &&
                                model->MOS6bulkJctSideGradingCoeff == .5) {
                            sarg = sargsw = 1/sqrt(arg);
                        } else {
                            if(model->MOS6bulkJctBotGradingCoeff == .5) {
                                sarg = 1/sqrt(arg);
                            } else {
#endif /*NOSQRT*/
                                sarg = exp(-model->MOS6bulkJctBotGradingCoeff*
                                        log(arg));
#ifndef NOSQRT
                            }
                            if(model->MOS6bulkJctSideGradingCoeff == .5) {
                                sargsw = 1/sqrt(arg);
                            } else {
#endif /*NOSQRT*/
                                sargsw =exp(-model->MOS6bulkJctSideGradingCoeff*
                                        log(arg));
#ifndef NOSQRT
                            }
                        }
#endif /*NOSQRT*/
                        *(ckt->CKTstate0 + here->MOS6qbd) =
                            here->MOS6tBulkPot*(here->MOS6Cbd*
                            (1-arg*sarg)
                            /(1-model->MOS6bulkJctBotGradingCoeff)
                            +here->MOS6Cbdsw*
                            (1-arg*sargsw)
                            /(1-model->MOS6bulkJctSideGradingCoeff));
                        here->MOS6capbd=here->MOS6Cbd*sarg+
                                here->MOS6Cbdsw*sargsw;
                    } else {
                        *(ckt->CKTstate0 + here->MOS6qbd) = here->MOS6f4d +
                                vbd * (here->MOS6f2d + vbd * here->MOS6f3d/2);
                        here->MOS6capbd=here->MOS6f2d + vbd * here->MOS6f3d;
                    }
#ifdef CAPZEROBYPASS
                } else {
                    *(ckt->CKTstate0 + here->MOS6qbd) = 0;
                    here->MOS6capbd = 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->MOS6capbd,
                            here->MOS6qbd);
                    if(error) return(error);
                    here->MOS6gbd += geq;
                    here->MOS6cbd += *(ckt->CKTstate0 + here->MOS6cqbd);
                    here->MOS6cd -= *(ckt->CKTstate0 + here->MOS6cqbd);
                    error = NIintegrate(ckt,&geq,&ceq,here->MOS6capbs,
                            here->MOS6qbs);
                    if(error) return(error);
                    here->MOS6gbs += geq;
                    here->MOS6cbs += *(ckt->CKTstate0 + here->MOS6cqbs);
                }
            }
/*

*/


            if(SenCond) goto next2;


            /*
             *  check convergence
             */
            if ( (here->MOS6off == 0)  || 
                    (!(ckt->CKTmode & (MODEINITFIX|MODEINITSMSIG))) ){
                if (Check == 1) {
                    ckt->CKTnoncon++;
		    ckt->CKTtroubleElt = (GENinstance *) here;
                }
            }
/*

*/


            /* save things away for next time */

next2:      *(ckt->CKTstate0 + here->MOS6vbs) = vbs;
            *(ckt->CKTstate0 + here->MOS6vbd) = vbd;
            *(ckt->CKTstate0 + here->MOS6vgs) = vgs;
            *(ckt->CKTstate0 + here->MOS6vds) = 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->MOS6mode > 0){
                    DEVqmeyer (vgs,vgd,vgb,von,vdsat,
                        (ckt->CKTstate0 + here->MOS6capgs),
                        (ckt->CKTstate0 + here->MOS6capgd),
                        (ckt->CKTstate0 + here->MOS6capgb),
                        here->MOS6tPhi,OxideCap);
                } else {
                    DEVqmeyer (vgd,vgs,vgb,von,vdsat,
                        (ckt->CKTstate0 + here->MOS6capgd),
                        (ckt->CKTstate0 + here->MOS6capgs),
                        (ckt->CKTstate0 + here->MOS6capgb),
                        here->MOS6tPhi,OxideCap);
                }
                vgs1 = *(ckt->CKTstate1 + here->MOS6vgs);
                vgd1 = vgs1 - *(ckt->CKTstate1 + here->MOS6vds);
                vgb1 = vgs1 - *(ckt->CKTstate1 + here->MOS6vbs);
                if(ckt->CKTmode & (MODETRANOP|MODEINITSMSIG)) {
                    capgs =  2 * *(ckt->CKTstate0+here->MOS6capgs)+ 
                              GateSourceOverlapCap ;
                    capgd =  2 * *(ckt->CKTstate0+here->MOS6capgd)+ 
                              GateDrainOverlapCap ;
                    capgb =  2 * *(ckt->CKTstate0+here->MOS6capgb)+ 
                              GateBulkOverlapCap ;
                } else {
                    capgs = ( *(ckt->CKTstate0+here->MOS6capgs)+ 
                              *(ckt->CKTstate1+here->MOS6capgs) +
                              GateSourceOverlapCap );
                    capgd = ( *(ckt->CKTstate0+here->MOS6capgd)+ 
                              *(ckt->CKTstate1+here->MOS6capgd) +
                              GateDrainOverlapCap );
                    capgb = ( *(ckt->CKTstate0+here->MOS6capgb)+ 
                              *(ckt->CKTstate1+here->MOS6capgb) +
                              GateBulkOverlapCap );
                }
                if(ckt->CKTsenInfo){
                    here->MOS6cgs = capgs;
                    here->MOS6cgd = capgd;
                    here->MOS6cgb = capgb;
                }
/*

*/

                /*
                 *     store small-signal parameters (for meyer's model)
                 *  all parameters already stored, so done...
                 */
                if(SenCond){
                    if((ckt->CKTsenInfo->SENmode == DCSEN)||
                            (ckt->CKTsenInfo->SENmode == ACSEN)){
                        continue;
                    }
                }

#ifndef PREDICTOR
                if (ckt->CKTmode & (MODEINITPRED | MODEINITTRAN) ) {
                    *(ckt->CKTstate0 + here->MOS6qgs) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS6qgs)
                        - xfact * *(ckt->CKTstate2 + here->MOS6qgs);
                    *(ckt->CKTstate0 + here->MOS6qgd) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS6qgd)
                        - xfact * *(ckt->CKTstate2 + here->MOS6qgd);
                    *(ckt->CKTstate0 + here->MOS6qgb) =
                        (1+xfact) * *(ckt->CKTstate1 + here->MOS6qgb)
                        - xfact * *(ckt->CKTstate2 + here->MOS6qgb);
                } else {
#endif /*PREDICTOR*/
                    if(ckt->CKTmode & MODETRAN) {
                        *(ckt->CKTstate0 + here->MOS6qgs) = (vgs-vgs1)*capgs +
                            *(ckt->CKTstate1 + here->MOS6qgs) ;
                        *(ckt->CKTstate0 + here->MOS6qgd) = (vgd-vgd1)*capgd +
                            *(ckt->CKTstate1 + here->MOS6qgd) ;
                        *(ckt->CKTstate0 + here->MOS6qgb) = (vgb-vgb1)*capgb +
                            *(ckt->CKTstate1 + here->MOS6qgb) ;
                    } else {
                        /* TRANOP only */
                        *(ckt->CKTstate0 + here->MOS6qgs) = vgs*capgs;
                        *(ckt->CKTstate0 + here->MOS6qgd) = vgd*capgd;
                        *(ckt->CKTstate0 + here->MOS6qgb) = 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->MOS6cqgs) =0;
                if(capgd == 0) *(ckt->CKTstate0 + here->MOS6cqgd) =0;
                if(capgb == 0) *(ckt->CKTstate0 + here->MOS6cqgb) =0;
                /*
                 *    calculate equivalent conductances and currents for
                 *    meyer"s capacitors
                 */
                error = NIintegrate(ckt,&gcgs,&ceqgs,capgs,here->MOS6qgs);
                if(error) return(error);
                error = NIintegrate(ckt,&gcgd,&ceqgd,capgd,here->MOS6qgd);
                if(error) return(error);
                error = NIintegrate(ckt,&gcgb,&ceqgb,capgb,here->MOS6qgb);
                if(error) return(error);
                ceqgs=ceqgs-gcgs*vgs+ckt->CKTag[0]* 
                        *(ckt->CKTstate0 + here->MOS6qgs);
                ceqgd=ceqgd-gcgd*vgd+ckt->CKTag[0]*
                        *(ckt->CKTstate0 + here->MOS6qgd);
                ceqgb=ceqgb-gcgb*vgb+ckt->CKTag[0]*
                        *(ckt->CKTstate0 + here->MOS6qgb);
            }
            /*
             *     store charge storage info for meyer's cap in lx table
             */

            /*
             *  load current vector
             */

            m = here->MOS6m;

            ceqbs = model->MOS6type * 
                    (here->MOS6cbs-(here->MOS6gbs)*vbs);
            ceqbd = model->MOS6type * 
                    (here->MOS6cbd-(here->MOS6gbd)*vbd);
            if (here->MOS6mode >= 0) {
                xnrm=1;
                xrev=0;
                cdreq=model->MOS6type*(cdrain-here->MOS6gds*vds-
                        here->MOS6gm*vgs-here->MOS6gmbs*vbs);
            } else {
                xnrm=0;
                xrev=1;
                cdreq = -(model->MOS6type)*(cdrain-here->MOS6gds*(-vds)-
                        here->MOS6gm*vgd-here->MOS6gmbs*vbd);
            }
            *(ckt->CKTrhs + here->MOS6gNode) -= 
                m * (model->MOS6type * (ceqgs + ceqgb + ceqgd));
            *(ckt->CKTrhs + here->MOS6bNode) -=
                m * (ceqbs + ceqbd - model->MOS6type * ceqgb);
            *(ckt->CKTrhs + here->MOS6dNodePrime) +=
                m * (ceqbd - cdreq + model->MOS6type * ceqgd);
            *(ckt->CKTrhs + here->MOS6sNodePrime) += 
                m * (cdreq + ceqbs + model->MOS6type * ceqgs);
            /*
             *  load y matrix
             */

            *(here->MOS6DdPtr) += m * (here->MOS6drainConductance);
            *(here->MOS6GgPtr) += m * ((gcgd+gcgs+gcgb));
            *(here->MOS6SsPtr) += m * (here->MOS6sourceConductance);
            *(here->MOS6BbPtr) += m * (here->MOS6gbd+here->MOS6gbs+gcgb);
            *(here->MOS6DPdpPtr) += 
                    m * (here->MOS6drainConductance+here->MOS6gds+
                    here->MOS6gbd+xrev*(here->MOS6gm+here->MOS6gmbs)+gcgd);
            *(here->MOS6SPspPtr) += 
                    m * (here->MOS6sourceConductance+here->MOS6gds+
                    here->MOS6gbs+xnrm*(here->MOS6gm+here->MOS6gmbs)+gcgs);
            *(here->MOS6DdpPtr) += m * (-here->MOS6drainConductance);
            *(here->MOS6GbPtr) -= m * gcgb;
            *(here->MOS6GdpPtr) -= m * gcgd;
            *(here->MOS6GspPtr) -= m * gcgs;
            *(here->MOS6SspPtr) += m * (-here->MOS6sourceConductance);
            *(here->MOS6BgPtr) -= m * gcgb;
            *(here->MOS6BdpPtr) -= m * (here->MOS6gbd);
            *(here->MOS6BspPtr) -= m * (here->MOS6gbs);
            *(here->MOS6DPdPtr) += m * (-here->MOS6drainConductance);
            *(here->MOS6DPgPtr) += m * ((xnrm-xrev)*here->MOS6gm-gcgd);
            *(here->MOS6DPbPtr) += m * (-here->MOS6gbd+(xnrm-xrev)*here->MOS6gmbs);
            *(here->MOS6DPspPtr) += m * (-here->MOS6gds-xnrm*
                    (here->MOS6gm+here->MOS6gmbs));
            *(here->MOS6SPgPtr) += m * (-(xnrm-xrev)*here->MOS6gm-gcgs);
            *(here->MOS6SPsPtr) += m * (-here->MOS6sourceConductance);
            *(here->MOS6SPbPtr) += m * (-here->MOS6gbs-(xnrm-xrev)*here->MOS6gmbs);
            *(here->MOS6SPdpPtr) += m * (-here->MOS6gds-xrev*
                    (here->MOS6gm+here->MOS6gmbs));
        }
    }
    return(OK);
}