Make voltage ramp smooth around 0 and around end of ramp.

3 years ago · a39052cd14
1 changed files with 1 additions and 1 deletions
--- a/src/spicelib/analysis/optran.c
+++ b/src/spicelib/analysis/optran.c
@ -657,7 +657,7 @@ resume:

        /* supply ramping, when opramptime > 0 */
        if (opramptime > 0)
-            ckt->CKTsrcFact = MIN(1., optime / opramptime);
+            ckt->CKTsrcFact = 0.5 * (1 - cos(M_PI * optime / opramptime));

        ckt->CKTdeltaOld[0]=ckt->CKTdelta;
        NIcomCof(ckt);