Bob Smither

Wow - what a difference! Thanks Holger.

NGSPICE is an amazing tool - many thanks to the developers. The following was run using ngspice 33 under CentOS7, 64 bit AMD Phenom II X6 I am simulating a nonlinear capacitor whose value depends on the voltage across the capacitor and ran into an interesting issue. Here is the example: nl cap example vin 1 0 dc 0 pulse(0 80 0 1n 1n 500u 1000u) r1 1 2 100k xc1 2 3 nlcap vx 3 0 dc 0 .control tran 5n 1000u plot v(2) .endc .subckt nlcap pos neg voltage on cap ex 1 0 pos neg 1 get time derivative (ic...