Run to time in SPICE

[sajjade]

Can anybody help me regarding the run to time setting in PSPICE. Results are not consistent with different "run to time setting" in edit simulation setting window. I am simulating MOSFET base CMOS circuits using SPICE models. How to set proper run to time to get accurate results.

 

[FvM]

Run to time settings will be usually suggested by the simulation problem, e.g. you'll want at least see several switching cycles, or a circuit should reach almost steady-state.

You can most likely get consistent results by specifying a maximum step size in a low ns or even sub-ns range, at cost of increased simulation time.

 

[sajjade]

Thank you very much FvM.
It worked nicely.
I am getting consistent results. My simulation run time is within 20ns. I can afford to set sub nanosecond step size.

with regards