remove drain and source resistance contributions

src/spicelib/devices/vdmos/vdmos.c

@@ -15,12 +15,6 @@ IFparm VDMOSpTable[] = { /* parameters */
  IOPU("m",            VDMOS_M,          IF_REAL,    "Multiplier"),
  IOPU("l",            VDMOS_L,          IF_REAL,    "Length"),
  IOPU("w",            VDMOS_W,          IF_REAL,    "Width"),
- IOPU("ad",           VDMOS_AD,         IF_REAL,    "Drain area"),
- IOPU("as",           VDMOS_AS,         IF_REAL,    "Source area"),
- IOPU("pd",           VDMOS_PD,         IF_REAL,    "Drain perimeter"),
- IOPU("ps",           VDMOS_PS,         IF_REAL,    "Source perimeter"),
- IOPU("nrd",          VDMOS_NRD,        IF_REAL,    "Drain squares"),
- IOPU("nrs",          VDMOS_NRS,        IF_REAL,    "Source squares"),
  IP("off",            VDMOS_OFF,        IF_FLAG,    "Device initially off"),
  IOPU("icvds",        VDMOS_IC_VDS,     IF_REAL,    "Initial D-S voltage"),
  IOPU("icvgs",        VDMOS_IC_VGS,     IF_REAL,    "Initial G-S voltage"),
@@ -125,7 +119,6 @@ IFparm VDMOSmPTable[] = { /* model parameters */
  IOP("gamma", VDMOS_MOD_GAMMA, IF_REAL,   "Bulk threshold parameter"),
  IOPA("cbd",  VDMOS_MOD_CBD,   IF_REAL,   "B-D junction capacitance"),
  IOPA("cbs",  VDMOS_MOD_CBS,   IF_REAL,   "B-S junction capacitance"),
- IOP("rsh",   VDMOS_MOD_RSH,   IF_REAL,   "Sheet resistance"),
  IOPA("cj",   VDMOS_MOD_CJ,    IF_REAL,   "Bottom junction cap per area"),
  IOP("mj",    VDMOS_MOD_MJ,    IF_REAL,   "Bottom grading coefficient"),
  IOPA("cjsw", VDMOS_MOD_CJSW,  IF_REAL,   "Side junction cap per area"),

src/spicelib/devices/vdmos/vdmosask.c

@@ -44,24 +44,6 @@ VDMOSask(CKTcircuit *ckt, GENinstance *inst, int which, IFvalue *value,
         case VDMOS_W:
             value->rValue = here->VDMOSw;
                 return(OK);
-        case VDMOS_AS:
-            value->rValue = here->VDMOSsourceArea;
-                return(OK);
-        case VDMOS_AD:
-            value->rValue = here->VDMOSdrainArea;
-                return(OK);
-        case VDMOS_PS:
-            value->rValue = here->VDMOSsourcePerimiter;
-                return(OK);
-        case VDMOS_PD:
-            value->rValue = here->VDMOSdrainPerimiter;
-                return(OK);
-        case VDMOS_NRS:
-            value->rValue = here->VDMOSsourceSquares;
-                return(OK);
-        case VDMOS_NRD:
-            value->rValue = here->VDMOSdrainSquares;
-                return(OK);
         case VDMOS_OFF:
             value->rValue = here->VDMOSoff;
                 return(OK);

src/spicelib/devices/vdmos/vdmosdefs.h

@@ -50,12 +50,6 @@ typedef struct sVDMOSinstance {
 
     double VDMOSl;   /* the length of the channel region */
     double VDMOSw;   /* the width of the channel region */
-    double VDMOSdrainArea;   /* the area of the drain diffusion */
-    double VDMOSsourceArea;  /* the area of the source diffusion */
-    double VDMOSdrainSquares;    /* the length of the drain in squares */
-    double VDMOSsourceSquares;   /* the length of the source in squares */
-    double VDMOSdrainPerimiter;
-    double VDMOSsourcePerimiter;
     double VDMOSsourceConductance;   /*conductance of source(or 0):set in setup*/
     double VDMOSdrainConductance;    /*conductance of drain(or 0):set in setup*/
     double VDMOSgateConductance;    /*conductance of gate(or 0):set in setup*/
@@ -171,12 +165,6 @@ typedef struct sVDMOSinstance {
     unsigned VDMOSmGiven :1;
     unsigned VDMOSlGiven :1;
     unsigned VDMOSwGiven :1;
-    unsigned VDMOSdrainAreaGiven :1;
-    unsigned VDMOSsourceAreaGiven    :1;
-    unsigned VDMOSdrainSquaresGiven  :1;
-    unsigned VDMOSsourceSquaresGiven :1;
-    unsigned VDMOSdrainPerimiterGiven    :1;
-    unsigned VDMOSsourcePerimiterGiven   :1;
     unsigned VDMOSdNodePrimeSet  :1;
     unsigned VDMOSsNodePrimeSet  :1;
     unsigned VDMOSicVBSGiven :1;
@@ -338,7 +326,6 @@ typedef struct sVDMOSmodel {       /* model structure for a resistor */
     unsigned VDMOSdrainResistanceGiven   :1;
     unsigned VDMOSsourceResistanceGiven  :1;
     unsigned VDMOSgateResistanceGiven    :1;
-    unsigned VDMOSsheetResistanceGiven   :1;
     unsigned VDMOStransconductanceGiven  :1;
     unsigned VDMOSvt0Given   :1;
     unsigned VDMOScapBDGiven :1;
@@ -377,12 +364,6 @@ typedef struct sVDMOSmodel {       /* model structure for a resistor */
 enum {
     VDMOS_W = 1,
     VDMOS_L,
-    VDMOS_AS,
-    VDMOS_AD,
-    VDMOS_PS,
-    VDMOS_PD,
-    VDMOS_NRS,
-    VDMOS_NRD,
     VDMOS_OFF,
     VDMOS_IC,
     VDMOS_IC_VBS,
@@ -417,7 +398,6 @@ enum {
     VDMOS_MOD_MJSW,
     VDMOS_MOD_JS,
     VDMOS_MOD_TOX,
-    VDMOS_MOD_RSH,
     VDMOS_MOD_U0,
     VDMOS_MOD_FC,
     VDMOS_MOD_NSUB,

src/spicelib/devices/vdmos/vdmosdset.c

@@ -82,17 +82,9 @@ VDMOSdSetup(GENmodel *inModel, CKTcircuit *ckt)
 
             vt = CONSTKoverQ * here->VDMOStemp;
 
-             if( (here->VDMOStSatCurDens == 0) ||
-                    (here->VDMOSdrainArea == 0) ||
-                    (here->VDMOSsourceArea == 0)) {
                 DrainSatCur = here->VDMOSm * here->VDMOStSatCur;
                 SourceSatCur = here->VDMOSm * here->VDMOStSatCur;
-            } else {
+
-                DrainSatCur = here->VDMOStSatCurDens *
-                        here->VDMOSm * here->VDMOSdrainArea;
-                SourceSatCur = here->VDMOStSatCurDens *
-                        here->VDMOSm * here->VDMOSsourceArea;
-            }
             Beta = here->VDMOStTransconductance * here->VDMOSm *
                     here->VDMOSw/here->VDMOSl;
 

src/spicelib/devices/vdmos/vdmosload.c

@@ -99,18 +99,8 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
              * here.  They may be moved at the expense of instance size
              */
 
-            if ((here->VDMOStSatCurDens == 0) ||
-                (here->VDMOSdrainArea == 0) ||
-                (here->VDMOSsourceArea == 0)) {
                 DrainSatCur = here->VDMOSm * here->VDMOStSatCur;
                 SourceSatCur = here->VDMOSm * here->VDMOStSatCur;
-            }
-            else {
-                DrainSatCur = here->VDMOStSatCurDens *
-                    here->VDMOSm * here->VDMOSdrainArea;
-                SourceSatCur = here->VDMOStSatCurDens *
-                    here->VDMOSm * here->VDMOSsourceArea;
-            }
             Beta = here->VDMOStTransconductance * here->VDMOSm *
                 here->VDMOSw / here->VDMOSl;
 

src/spicelib/devices/vdmos/vdmosmask.c

@@ -96,9 +96,6 @@ VDMOSmAsk(CKTcircuit *ckt, GENmodel *inst, int which, IFvalue *value)
         case VDMOS_MOD_TOX:
             value->rValue = model->VDMOSoxideThickness;
             return(OK);
-        case VDMOS_MOD_RSH:
-            value->rValue = model->VDMOSsheetResistance;
-            return(OK);
         case VDMOS_MOD_U0:
             value->rValue = model->VDMOSsurfaceMobility;
             return(OK);

src/spicelib/devices/vdmos/vdmosmpar.c

@@ -91,10 +91,6 @@ VDMOSmParam(int param, IFvalue *value, GENmodel *inModel)
             model->VDMOSoxideThickness = value->rValue;
             model->VDMOSoxideThicknessGiven = TRUE;
             break;
-        case VDMOS_MOD_RSH:
-            model->VDMOSsheetResistance = value->rValue;
-            model->VDMOSsheetResistanceGiven = TRUE;
-            break;
         case VDMOS_MOD_U0:
             model->VDMOSsurfaceMobility = value->rValue;
             model->VDMOSsurfaceMobilityGiven = TRUE;

src/spicelib/devices/vdmos/vdmospar.c

@@ -49,30 +49,6 @@ VDMOSparam(int param, IFvalue *value, GENinstance *inst, IFvalue *select)
             here->VDMOSl = value->rValue * scale;
             here->VDMOSlGiven = TRUE;
             break;
-        case VDMOS_AS:
-            here->VDMOSsourceArea = value->rValue * scale * scale;
-            here->VDMOSsourceAreaGiven = TRUE;
-            break;
-        case VDMOS_AD:
-            here->VDMOSdrainArea = value->rValue * scale * scale;
-            here->VDMOSdrainAreaGiven = TRUE;
-            break;
-        case VDMOS_PS:
-            here->VDMOSsourcePerimiter = value->rValue * scale;
-            here->VDMOSsourcePerimiterGiven = TRUE;
-            break;
-        case VDMOS_PD:
-            here->VDMOSdrainPerimiter = value->rValue * scale;
-            here->VDMOSdrainPerimiterGiven = TRUE;
-            break;
-        case VDMOS_NRS:
-            here->VDMOSsourceSquares = value->rValue;
-            here->VDMOSsourceSquaresGiven = TRUE;
-            break;
-        case VDMOS_NRD:
-            here->VDMOSdrainSquares = value->rValue;
-            here->VDMOSdrainSquaresGiven = TRUE;
-            break;
         case VDMOS_OFF:
             here->VDMOSoff = (value->iValue != 0);
             break;

src/spicelib/devices/vdmos/vdmosset.c

@@ -96,9 +96,6 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
             here->VDMOSstates = *states;
             *states += VDMOSnumStates;
 
-            if (!here->VDMOSdrainPerimiterGiven) {
-                here->VDMOSdrainPerimiter = 0;
-            }
             if (!here->VDMOSicVBSGiven) {
                 here->VDMOSicVBS = 0;
             }
@@ -108,25 +105,13 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
             if (!here->VDMOSicVGSGiven) {
                 here->VDMOSicVGS = 0;
             }
-            if (!here->VDMOSsourcePerimiterGiven) {
-                here->VDMOSsourcePerimiter = 0;
-            }
             if (!here->VDMOSvdsatGiven) {
                 here->VDMOSvdsat = 0;
             }
             if (!here->VDMOSvonGiven) {
                 here->VDMOSvon = 0;
             }
-            if (!here->VDMOSdrainSquaresGiven) {
+            if (model->VDMOSdrainResistance != 0) {
-                here->VDMOSdrainSquares = 1;
-            }
-            if (!here->VDMOSsourceSquaresGiven) {
-                here->VDMOSsourceSquares = 1;
-            }
-
-            if ((model->VDMOSdrainResistance != 0
-                || (model->VDMOSsheetResistance != 0
-                    && here->VDMOSdrainSquares != 0))) {
                 if (here->VDMOSdNodePrime == 0) {
                     error = CKTmkVolt(ckt, &tmp, here->VDMOSname, "drain");
                     if (error) return(error);
@@ -150,9 +135,7 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
                 here->VDMOSdNodePrime = here->VDMOSdNode;
             }
 
-            if ((model->VDMOSsourceResistance != 0 ||
+            if (model->VDMOSsourceResistance != 0) {
-                (model->VDMOSsheetResistance != 0 &&
-                    here->VDMOSsourceSquares != 0))) {
                 if (here->VDMOSsNodePrime == 0) {
                     error = CKTmkVolt(ckt, &tmp, here->VDMOSname, "source");
                     if (error) return(error);

src/spicelib/devices/vdmos/vdmostemp.c

@@ -141,18 +141,12 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
             arg = -egfet/(kt+kt)+1.1150877/(CONSTboltz*(REFTEMP+REFTEMP));
             pbfact = -2*vt *(1.5*log(fact2)+CHARGE*arg);
 
-            if(!here->VDMOSdrainAreaGiven) {
-                here->VDMOSdrainArea = ckt->CKTdefaultMosAD;
-            }
             if(!here->VDMOSmGiven) {
                 here->VDMOSm = 1;
             }
             if(!here->VDMOSlGiven) {
                 here->VDMOSl = 1;
             }
-            if(!here->VDMOSsourceAreaGiven) {
-                here->VDMOSsourceArea = ckt->CKTdefaultMosAS;
-            }
             if(!here->VDMOSwGiven) {
                 here->VDMOSw = 1;
             }
@@ -194,37 +188,17 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
                     (4e-4*(here->VDMOStemp-REFTEMP)-gmanew));
             here->VDMOStCjsw *= capfact;
             here->VDMOStDepCap = model->VDMOSfwdCapDepCoeff * here->VDMOStBulkPot;
-            if( (here->VDMOStSatCurDens == 0) ||
+            if (here->VDMOStSatCurDens == 0) {
-                    (here->VDMOSdrainArea == 0) ||
-                    (here->VDMOSsourceArea == 0) ) {
                 here->VDMOSsourceVcrit = here->VDMOSdrainVcrit =
                        vt*log(vt/(CONSTroot2*here->VDMOSm*here->VDMOStSatCur));
-            } else {
-                here->VDMOSdrainVcrit =
-                        vt * log( vt / (CONSTroot2 *
-                        here->VDMOSm *
-                        here->VDMOStSatCurDens * here->VDMOSdrainArea));
-                here->VDMOSsourceVcrit =
-                        vt * log( vt / (CONSTroot2 *
-                        here->VDMOSm *
-                        here->VDMOStSatCurDens * here->VDMOSsourceArea));
             }
 
             if(model->VDMOScapBDGiven) {
                 czbd = here->VDMOStCbd * here->VDMOSm;
             } else {
-                if(model->VDMOSbulkCapFactorGiven) {
-                    czbd=here->VDMOStCj*here->VDMOSm*here->VDMOSdrainArea;
-                } else {
                     czbd=0;
-                }
             }
-            if(model->VDMOSsideWallCapFactorGiven) {
-                czbdsw= here->VDMOStCjsw * here->VDMOSdrainPerimiter *
-                     here->VDMOSm;
-            } else {
                 czbdsw=0;
-            }
             arg = 1-model->VDMOSfwdCapDepCoeff;
             sarg = exp( (-model->VDMOSbulkJctBotGradingCoeff) * log(arg) );
             sargsw = exp( (-model->VDMOSbulkJctSideGradingCoeff) * log(arg) );
@@ -249,18 +223,9 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
             if(model->VDMOScapBSGiven) {
                 czbs=here->VDMOStCbs * here->VDMOSm;
             } else {
-                if(model->VDMOSbulkCapFactorGiven) {
-                   czbs=here->VDMOStCj*here->VDMOSsourceArea * here->VDMOSm;
-                } else {
                     czbs=0;
-                }
             }
-            if(model->VDMOSsideWallCapFactorGiven) {
-                czbssw = here->VDMOStCjsw * here->VDMOSsourcePerimiter *
-                          here->VDMOSm;
-            } else {
                 czbssw=0;
-            }
             arg = 1-model->VDMOSfwdCapDepCoeff;
             sarg = exp( (-model->VDMOSbulkJctBotGradingCoeff) * log(arg) );
             sargsw = exp( (-model->VDMOSbulkJctSideGradingCoeff) * log(arg) );
@@ -292,14 +257,6 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
                 else {
                     here->VDMOSdrainConductance = 0;
                 }
-            } else if (model->VDMOSsheetResistanceGiven) {
-                if(model->VDMOSsheetResistance != 0) {
-                    here->VDMOSdrainConductance =
-                       here->VDMOSm /
-                          (model->VDMOSsheetResistance*here->VDMOSdrainSquares);
-                } else {
-                    here->VDMOSdrainConductance = 0;
-                }
             } else {
                 here->VDMOSdrainConductance = 0;
             }
@@ -310,15 +267,6 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
                 } else {
                     here->VDMOSsourceConductance = 0;
                 }
-            } else if (model->VDMOSsheetResistanceGiven) {
-                if ((model->VDMOSsheetResistance != 0) &&
-                                   (here->VDMOSsourceSquares != 0)) {
-                    here->VDMOSsourceConductance =
-                        here->VDMOSm /
-                          (model->VDMOSsheetResistance*here->VDMOSsourceSquares);
-                } else {
-                    here->VDMOSsourceConductance = 0;
-                }
             } else {
                 here->VDMOSsourceConductance = 0;
             }