luke
/
ngspice
mirror of https://git.code.sf.net/p/ngspice/ngspice
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

setting gmbs direct to 0

This commit is contained in:
dwarning 2018-11-11 17:10:53 +01:00 committed by Holger Vogt
parent 92efc0bd6c
commit 7c94cc2e42
1 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/spicelib/devices/vdmos/vdmosload.c
View File

@ -356,17 +356,15 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
* *
*/ */
/* the following 4 variables are local to this code block until /* the following 2 variables are local to this code block until
* it is obvious that they can be made global * it is obvious that they can be made global
*/ */
double arg;
double betap; double betap;
double vgst; double vgst;
von = (model->VDMOSvt0*model->VDMOStype); von = (model->VDMOSvt0*model->VDMOStype);
vgst = (here->VDMOSmode == 1 ? vgs : vgd) - von; vgst = (here->VDMOSmode == 1 ? vgs : vgd) - von;
vdsat = MAX(vgst, 0); vdsat = MAX(vgst, 0);
arg = 0;
/* drain current including subthreshold current /* drain current including subthreshold current
* numerical differentiation for gd and gm with a delta of 2 mV */ * numerical differentiation for gd and gm with a delta of 2 mV */
if (model->VDMOSksubthresGiven && (here->VDMOSmode == 1)) { if (model->VDMOSksubthresGiven && (here->VDMOSmode == 1)) {
@ -432,7 +430,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
cdrain = betap*vgst*vgst*.5; cdrain = betap*vgst*vgst*.5;
here->VDMOSgm = betap*vgst; here->VDMOSgm = betap*vgst;
here->VDMOSgds = model->VDMOSlambda*Beta*vgst*vgst*.5; here->VDMOSgds = model->VDMOSlambda*Beta*vgst*vgst*.5;
here->VDMOSgmbs = here->VDMOSgm*arg; here->VDMOSgmbs = 0.;
} else { } else {
/* /*
* linear region * linear region
@ -444,7 +442,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
model->VDMOSlambda * Beta * model->VDMOSlambda * Beta *
(vds * here->VDMOSmode) * mtr * (vds * here->VDMOSmode) * mtr *
(vgst - .5 * (vds * here->VDMOSmode) * mtr); (vgst - .5 * (vds * here->VDMOSmode) * mtr);
here->VDMOSgmbs = here->VDMOSgm * arg; here->VDMOSgmbs = 0.;
} }
} }
} }