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Choose better interpolation and default parameters

This commit is contained in:
Holger Vogt 2018-04-23 21:45:14 +02:00 committed by rlar
parent 729eac4e84
commit 3ee3ab39a9
1 changed files with 3 additions and 3 deletions
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6
src/spicelib/devices/vdmos/vdmosload.c
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@ -890,13 +890,13 @@ scalef(double nf2, double vgst)
static double
cweakinv(double slope, double shift, double vgst, double vds, double lambda, double beta, double vt, double mtr)
{
vgst += shift * (1 - scalef(2, vgst));
vgst += shift * (1 - scalef(0.5, vgst));
double n = slope / 2.3 / 0.0256; /* Tsividis, p. 208 */
double n1 = n + (1 - n) * scalef(2, vgst); /* n < n1 < 1 */
double n1 = n + (1 - n) * scalef(1, vgst); /* n < n1 < 1 */
double first = log(1 + exp(vgst / (2 * n1 * vt)));
double second = log(1 + exp((vgst - vds * mtr * n1) / (2 * n1 * vt)));
double cds =
beta * n1 * 2 * vt * vt * (1 + scalef(2, vgst) * lambda * vds) *
beta * n1 * 2 * vt * vt * (1 + scalef(1, vgst) * lambda * vds) *
(first * first - second * second);
return cds;
}