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diode needs both current components (bottom and sidewall) for Vcrit and breakdown voltage calculation

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dwarning 2025-07-28 00:07:07 +02:00 committed by Holger Vogt
parent 05bbb2aaa2
commit 68c3fc1031
1 changed files with 7 additions and 6 deletions
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13
src/spicelib/devices/dio/diotemp.c
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@ -196,7 +196,8 @@ void DIOtempUpdate(DIOmodel *inModel, DIOinstance *here, double Temp, CKTcircuit
here->DIOtDepSWCap=model->DIOdepletionSWcapCoeff* here->DIOtDepSWCap=model->DIOdepletionSWcapCoeff*
here->DIOtJctSWPot; here->DIOtJctSWPot;
/* and Vcrit */ /* and Vcrit */
here->DIOtVcrit = vte * log(vte/(CONSTroot2*here->DIOtSatCur)); double totalSatCur = here->DIOtSatCur + here->DIOtSatSWCur;
here->DIOtVcrit = vte * log(vte/(CONSTroot2*totalSatCur));
/* and now to compute the breakdown voltage, again, using /* and now to compute the breakdown voltage, again, using
* temperature adjusted basic parameters */ * temperature adjusted basic parameters */
@ -211,9 +212,9 @@ void DIOtempUpdate(DIOmodel *inModel, DIOinstance *here, double Temp, CKTcircuit
} else { /* level=3 */ } else { /* level=3 */
cbv = model->DIObreakdownCurrent * here->DIOarea * here->DIOm; cbv = model->DIObreakdownCurrent * here->DIOarea * here->DIOm;
} }
if (cbv < here->DIOtSatCur * tBreakdownVoltage/vt) { if (cbv < totalSatCur * tBreakdownVoltage/vt) {
#ifdef TRACE #ifdef TRACE
cbv=here->DIOtSatCur * tBreakdownVoltage/vt; cbv=totalSatCur * tBreakdownVoltage/vt;
SPfrontEnd->IFerrorf (ERR_WARNING, "%s: breakdown current increased to %g to resolve", here->DIOname, cbv); SPfrontEnd->IFerrorf (ERR_WARNING, "%s: breakdown current increased to %g to resolve", here->DIOname, cbv);
SPfrontEnd->IFerrorf (ERR_WARNING, SPfrontEnd->IFerrorf (ERR_WARNING,
"incompatibility with specified saturation current"); "incompatibility with specified saturation current");
@ -222,11 +223,11 @@ void DIOtempUpdate(DIOmodel *inModel, DIOinstance *here, double Temp, CKTcircuit
} else { } else {
tol=ckt->CKTreltol*cbv; tol=ckt->CKTreltol*cbv;
xbv=tBreakdownVoltage-model->DIObrkdEmissionCoeff*vt*log(1+cbv/ xbv=tBreakdownVoltage-model->DIObrkdEmissionCoeff*vt*log(1+cbv/
(here->DIOtSatCur)); totalSatCur);
for(iter=0 ; iter < 25 ; iter++) { for(iter=0 ; iter < 25 ; iter++) {
xbv=tBreakdownVoltage-model->DIObrkdEmissionCoeff*vt*log(cbv/ xbv=tBreakdownVoltage-model->DIObrkdEmissionCoeff*vt*log(cbv/
(here->DIOtSatCur)+1-xbv/vt); totalSatCur+1-xbv/vt);
xcbv=here->DIOtSatCur * xcbv=totalSatCur *
(exp((tBreakdownVoltage-xbv)/(model->DIObrkdEmissionCoeff*vt))-1+xbv/vt); (exp((tBreakdownVoltage-xbv)/(model->DIObrkdEmissionCoeff*vt))-1+xbv/vt);
if (fabs(xcbv-cbv) <= tol) goto matched; if (fabs(xcbv-cbv) <= tol) goto matched;
} }