VDMOS rise minimal diode resistance for better convergence

src/spicelib/devices/vdmos/vdmosset.c

@@ -107,7 +107,7 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
             model->VDMOSrds = 1.0e+15;
 
         if (!model->VDIOresistanceGiven)
-            model->VDIOresistance = 1.0e-03;
+            model->VDIOresistance = 10e-03;
 
         if (!model->VDMOSnGiven)
             model->VDMOSn = 1.;
@@ -242,10 +242,10 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
             } else {
                 here->VDMOSdsConductance = 1e-15;
             }
-            if (model->VDIOresistance != 0) {
+            if (model->VDIOresistance > 10e-03) {
                 here->VDIOconductance = here->VDMOSm / model->VDIOresistance;
             } else {
-                here->VDIOconductance = here->VDMOSm / 1.0e-03;
+                here->VDIOconductance = here->VDMOSm / 10e-03;
             }
 
             if (model->VDMOSdrainResistance != 0) {