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devices/bjt/bjttemp.c, bug fix, capacity temperature dependency 

Fix a very old bug in the implementation of the
  gummel-poon model formulas for the junction capacities.
  (already in spice3f4)
For unknown reasons, the same formulas in the
  diode mos1 mos2 mos6 jfet models
have been implemented correctly right from the beginning,
the typo was bjt specific.

Many Thanks for the concise and precise Bug Report
  provided by Schabo Rumanus on the ngspice-users mailing list
> To: ngspice-users@lists.sourceforge.net
> Subject: [Ngspice-users] Temperatursimulation von Sperrschichtkapazitäten

Many Thanks to Dietmar Warning for his thorough verification
  of this commit.
This commit is contained in:
rlar 2017-12-17 20:57:36 +01:00
parent f0159cbd0b
commit 57a0a5dec0
1 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/spicelib/devices/bjt/bjttemp.c
View File

@ -24,6 +24,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
BJTinstance *here;
double xfc;
double vt;
double vtnom;
double ratlog;
double ratio1;
double factlog;
@ -40,6 +41,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
for( ; model != NULL; model = model->BJTnextModel ) {
if(!model->BJTtnomGiven) model->BJTtnom = ckt->CKTnomTemp;
vtnom = CONSTKoverQ * model->BJTtnom;
fact1 = model->BJTtnom/REFTEMP;
if(!model->BJTleakBEcurrentGiven) {
@ -101,6 +103,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
for (here = model->BJTinstances; here != NULL ;
here=here->BJTnextInstance) {
double arg1, pbfact1, egfet1;
if(!here->BJTdtempGiven)
here->BJTdtemp = 0.0;
@ -162,6 +165,11 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
arg = -egfet/(2*CONSTboltz*here->BJTtemp)+
1.1150877/(CONSTboltz*(REFTEMP+REFTEMP));
pbfact = -2*vt*(1.5*log(fact2)+CHARGE*arg);
egfet1 = 1.16-(7.02e-4*model->BJTtnom*model->BJTtnom)/
(model->BJTtnom+1108);
arg1 = -egfet1/(2*CONSTboltz*model->BJTtnom)+
1.1150877/(CONSTboltz*(REFTEMP+REFTEMP));
pbfact1 = -2*vtnom*(1.5*log(fact1)+CHARGE*arg1);
ratlog = log(here->BJTtemp/model->BJTtnom);
ratio1 = here->BJTtemp/model->BJTtnom -1;
@ -200,7 +208,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
}
if (model->BJTtlevc == 0) {
pbo = (model->BJTpotentialBE-pbfact)/fact1;
pbo = (model->BJTpotentialBE-pbfact1)/fact1;
gmaold = (model->BJTpotentialBE-pbo)/pbo;
here->BJTtBEcap = model->BJTdepletionCapBE/
(1+here->BJTtjunctionExpBE*
@ -215,7 +223,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
here->BJTtBEpot = model->BJTpotentialBE - model->BJTtvje*dt;
}
if (model->BJTtlevc == 0) {
pbo = (model->BJTpotentialBC-pbfact)/fact1;
pbo = (model->BJTpotentialBC-pbfact1)/fact1;
gmaold = (model->BJTpotentialBC-pbo)/pbo;
here->BJTtBCcap = model->BJTdepletionCapBC/
(1+here->BJTtjunctionExpBC*
@ -230,7 +238,7 @@ BJTtemp(GENmodel *inModel, CKTcircuit *ckt)
here->BJTtBCpot = model->BJTpotentialBC - model->BJTtvjc*dt;
}
if (model->BJTtlevc == 0) {
pbo = (model->BJTpotentialSubstrate-pbfact)/fact1;
pbo = (model->BJTpotentialSubstrate-pbfact1)/fact1;
gmaold = (model->BJTpotentialSubstrate-pbo)/pbo;
here->BJTtSubcap = model->BJTcapSub/
(1+here->BJTtjunctionExpSub*