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spice like derivative style - more compact

This commit is contained in:
dwarning 2018-12-02 12:10:12 +01:00 committed by Holger Vogt
parent 71524f6060
commit 3d72931125
1 changed files with 21 additions and 24 deletions
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45
src/spicelib/devices/vdmos/vdmosload.c
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@ -290,7 +290,6 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
* Best fits LTSPICE curves with shift=0 * Best fits LTSPICE curves with shift=0
* Drain current including subthreshold current */ * Drain current including subthreshold current */
double t0, t1, t2, t3, t4, t5, t6;
double slope = model->VDMOSksubthres; double slope = model->VDMOSksubthres;
double lambda = model->VDMOSlambda; double lambda = model->VDMOSlambda;
double theta = model->VDMOStheta; double theta = model->VDMOStheta;
@ -299,34 +298,30 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
/* scale vds with mtr (except with lambda) */ /* scale vds with mtr (except with lambda) */
double vdss = vds*mtr*here->VDMOSmode; double vdss = vds*mtr*here->VDMOSmode;
t0 = 1 + lambda*vds*here->VDMOSmode; double dvdssdvds = mtr*here->VDMOSmode;
t1 = 1 + theta*vgs; double t0 = 1 + lambda*vds*here->VDMOSmode;
double t1 = 1 + theta*vgs;
betap = Beta*t0/t1; betap = Beta*t0/t1;
double dbetapdvgs = -Beta*theta*t0/(t1*t1);
double dbetapdvds = Beta*lambda/t1;
vgst = slope * log(1 + exp((vgst - shift) / slope)); double t2 = exp((vgst-shift)/slope);
vgst = slope * log(1 + t2);
double dvgstdvgs = t2/(t2+1);
if (vgst <= vdss) { if (vgst <= vdss) {
/* saturation region */ /* saturation region */
cdrain = betap*vgst*vgst*0.5; cdrain = betap*vgst*vgst*.5;
t2 = exp((vgst-shift)/slope); here->VDMOSgm = betap*vgst*dvgstdvgs + 0.5*dbetapdvgs*vgst*vgst;
t3 = Beta*slope*t2*log(t2+1)*t0/(t1*(t2+1)); here->VDMOSgds = .5*dbetapdvds*vgst*vgst;
t4 = Beta*slope*slope*theta*log((t2+1)*(t2+1))*t0/(2*t1*t1); printf("s1 vds: %g vgs: %g cd: %g gds: %g gm: %g\n", vds, vgs, cdrain, here->VDMOSgds, here->VDMOSgm);
here->VDMOSgm = t3-t4;
t3 = Beta*slope*slope*log((t2+1)*(t2+1))*lambda;
t4 = 2*t1;
here->VDMOSgds = t3/t4;
} }
else { else {
/* linear region */ /* linear region */
cdrain = betap * vdss * (vgst - 0.5 * vdss); cdrain = betap * vdss * (vgst - .5 * vdss);
t3 = exp((vgst-shift)/slope); here->VDMOSgm = betap*vdss*dvgstdvgs + vdss*dbetapdvgs*(vgst-.5*vdss);
t4 = Beta*vdss*t3*t0/(t1*(t3+1)); here->VDMOSgds = vdss*dbetapdvds*(vgst-.5*vdss) + betap*dvdssdvds*(vgst-.5*vdss) - .5*vdss*betap*dvdssdvds;
t5 = Beta*vdss*theta*(slope*log(t3+1)-0.5*vdss)*t0/(t1*t1); printf("l1 vds: %g vgs: %g cd: %g gds: %g gm: %g\n", vds, vgs, cdrain, here->VDMOSgds, here->VDMOSgm);
here->VDMOSgm = t4-t5;
t4 = Beta*mtr*(slope*log(t3+1)-0.5*vdss)*t0/t1;
t5 = Beta*0.5*mtr*vdss*t0/t1;
t6 = Beta*vdss*(slope*log(t3+1)-0.5*vdss)*lambda/t1;
here->VDMOSgds = t4-t5+t6;
} }
} }
else if (model->VDMOSsubslGiven) { else if (model->VDMOSsubslGiven) {
@ -365,16 +360,17 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
here->VDMOSgm = 0; here->VDMOSgm = 0;
here->VDMOSgds = 0; here->VDMOSgds = 0;
} else { } else {
/*
* saturation region
*/
/* scale vds with mtr */ /* scale vds with mtr */
double mtr = model->VDMOSmtr; double mtr = model->VDMOSmtr;
betap = Betam*(1 + model->VDMOSlambda*(vds*here->VDMOSmode)); betap = Betam*(1 + model->VDMOSlambda*(vds*here->VDMOSmode));
if (vgst <= (vds * here->VDMOSmode) * mtr) { if (vgst <= (vds * here->VDMOSmode) * mtr) {
/*
* saturation region
*/
cdrain = betap*vgst*vgst*.5; cdrain = betap*vgst*vgst*.5;
here->VDMOSgm = betap*vgst * fgate + dfgdvg * cdrain; here->VDMOSgm = betap*vgst * fgate + dfgdvg * cdrain;
here->VDMOSgds = model->VDMOSlambda*Betam*vgst*vgst*.5; here->VDMOSgds = model->VDMOSlambda*Betam*vgst*vgst*.5;
printf("s2 vds: %g vgs: %g cd: %g gds: %g gm: %g\n", vds, vgs, cdrain, here->VDMOSgds, here->VDMOSgm);
} else { } else {
/* /*
* linear region * linear region
@ -386,6 +382,7 @@ VDMOSload(GENmodel *inModel, CKTcircuit *ckt)
model->VDMOSlambda * Betam * model->VDMOSlambda * Betam *
(vds * here->VDMOSmode) * mtr * (vds * here->VDMOSmode) * mtr *
(vgst - .5 * (vds * here->VDMOSmode) * mtr); (vgst - .5 * (vds * here->VDMOSmode) * mtr);
printf("l2 vds: %g vgs: %g cd: %g gds: %g gm: %g\n", vds, vgs, cdrain, here->VDMOSgds, here->VDMOSgm);
} }
} }
} }