From 0a213bea1a6f9849a11476184f35ffe5329bfc9c Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 4 Apr 2018 15:03:43 +0200
Subject: [PATCH] more on removing the sidewall capacitance

---
 src/spicelib/devices/vdmos/vdmosdefs.h |  2 --
 src/spicelib/devices/vdmos/vdmosload.c | 10 ++++------
 src/spicelib/devices/vdmos/vdmostemp.c | 15 ---------------
 3 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/src/spicelib/devices/vdmos/vdmosdefs.h b/src/spicelib/devices/vdmos/vdmosdefs.h
index 6f1a3dd2d..ce89c5723 100644
--- a/src/spicelib/devices/vdmos/vdmosdefs.h
+++ b/src/spicelib/devices/vdmos/vdmosdefs.h
@@ -88,9 +88,7 @@ typedef struct sVDMOSinstance {
     double VDMOScapbd;
     double VDMOScapbs;
     double VDMOSCbd;
-    double VDMOSCbdsw;
     double VDMOSCbs;
-    double VDMOSCbssw;
     double VDMOSf2d;
     double VDMOSf3d;
     double VDMOSf4d;
diff --git a/src/spicelib/devices/vdmos/vdmosload.c b/src/spicelib/devices/vdmos/vdmosload.c
index bcb3ef384..34c272135 100644
--- a/src/spicelib/devices/vdmos/vdmosload.c
+++ b/src/spicelib/devices/vdmos/vdmosload.c
@@ -483,7 +483,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
                   */
                 {
                     /* can't bypass the diode capacitance calculations */
-                    if (here->VDMOSCbs != 0 || here->VDMOSCbssw != 0) {
+                    if (here->VDMOSCbs != 0) {
                         if (vbs < here->VDMOStDepCap) {
                             arg = 1 - vbs / here->VDMOStBulkPot;
                             /*
@@ -504,8 +504,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
                             *(ckt->CKTstate0 + here->VDMOSqbs) =
                                 here->VDMOStBulkPot*(here->VDMOSCbs*
                                 (1 - arg*sarg) / (1 - model->VDMOSbulkJctBotGradingCoeff));
-                            here->VDMOScapbs = here->VDMOSCbs*sarg +
-                                here->VDMOSCbssw*sargsw;
+                            here->VDMOScapbs = here->VDMOSCbs * sarg;
                         }
                         else {
                             *(ckt->CKTstate0 + here->VDMOSqbs) = here->VDMOSf4s +
@@ -519,7 +518,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
                     }
                 }
                 {
-                    if (here->VDMOSCbd != 0 || here->VDMOSCbdsw != 0) {
+                    if (here->VDMOSCbd != 0) {
                         if (vbd < here->VDMOStDepCap) {
                             arg = 1 - vbd / here->VDMOStBulkPot;
                             /*
@@ -545,8 +544,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
                                 here->VDMOStBulkPot*(here->VDMOSCbd*
                                 (1 - arg*sarg)
                                     / (1 - model->VDMOSbulkJctBotGradingCoeff));
-                            here->VDMOScapbd = here->VDMOSCbd*sarg +
-                                here->VDMOSCbdsw*sargsw;
+                            here->VDMOScapbd = here->VDMOSCbd * sarg;
                         }
                         else {
                             *(ckt->CKTstate0 + here->VDMOSqbd) = here->VDMOSf4d +
diff --git a/src/spicelib/devices/vdmos/vdmostemp.c b/src/spicelib/devices/vdmos/vdmostemp.c
index d2e1b83ed..a199569c4 100644
--- a/src/spicelib/devices/vdmos/vdmostemp.c
+++ b/src/spicelib/devices/vdmos/vdmostemp.c
@@ -117,12 +117,9 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
         for(here = VDMOSinstances(model); here!= NULL; 
                 here = VDMOSnextInstance(here)) {
             double czbd;    /* zero voltage bulk-drain capacitance */
-            double czbdsw;  /* zero voltage bulk-drain sidewall capacitance */
             double czbs;    /* zero voltage bulk-source capacitance */
-            double czbssw;  /* zero voltage bulk-source sidewall capacitance */
             double arg;     /* 1 - fc */
             double sarg;    /* (1-fc) ^^ (-mj) */
-            double sargsw;  /* (1-fc) ^^ (-mjsw) */
 
             /* perform the parameter defaulting */
             
@@ -187,16 +184,10 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
                        vt*log(vt/(CONSTroot2*here->VDMOSm*here->VDMOStSatCur));
             }
 
-            if(model->VDMOScapBDGiven) {
-                czbd = here->VDMOStCbd * here->VDMOSm;
-            } else {
                     czbd=0;
-            }
-                czbdsw=0;
             arg = 1-model->VDMOSfwdCapDepCoeff;
             sarg = exp( (-model->VDMOSbulkJctBotGradingCoeff) * log(arg) );
             here->VDMOSCbd = czbd;
-            here->VDMOSCbdsw = czbdsw;
             here->VDMOSf2d = czbd * (1 - model->VDMOSfwdCapDepCoeff *
                 (1 + model->VDMOSbulkJctBotGradingCoeff)) * sarg / arg;
             here->VDMOSf3d = czbd * model->VDMOSbulkJctBotGradingCoeff * sarg / arg /
@@ -206,16 +197,10 @@ VDMOStemp(GENmodel *inModel, CKTcircuit *ckt)
                     -here->VDMOSf3d/2*
                         (here->VDMOStDepCap*here->VDMOStDepCap)
                     -here->VDMOStDepCap * here->VDMOSf2d;
-            if(model->VDMOScapBSGiven) {
-                czbs=here->VDMOStCbs * here->VDMOSm;
-            } else {
                     czbs=0;
-            }
-                czbssw=0;
             arg = 1-model->VDMOSfwdCapDepCoeff;
             sarg = exp( (-model->VDMOSbulkJctBotGradingCoeff) * log(arg) );
             here->VDMOSCbs = czbs;
-            here->VDMOSCbssw = czbssw;
             here->VDMOSf2s = czbs * (1 - model->VDMOSfwdCapDepCoeff *
                 (1 + model->VDMOSbulkJctBotGradingCoeff)) * sarg / arg;
             here->VDMOSf3s = czbs * model->VDMOSbulkJctBotGradingCoeff * sarg / arg /