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Simulators >> Circuit Simulators >> PSS and pac analysis on comparator with internal hysteresis
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Message started by avlsi on Feb 27^th, 2013, 10:35pm

Title: PSS and pac analysis on comparator with internal hysteresis
Post by avlsi on Feb 27^th, 2013, 10:35pm

I need to simulate a GAIN of a comparator which has internal hysteresis.
when i run PSS and PAC analysis, i am getting an error.

Simulator: Spice3
Error: Floating point exeception.

How can i solve this error?

Title: Re: PSS and pac analysis on comparator with internal hysteresis
Post by Geoffrey_Coram on Mar 1^st, 2013, 8:07am

The Spice3 I know doesn't support PSS nor PAC. Are you really using Spice3? Are you using a shooting method for PSS? Can you try fixed-point iterations? Can you have it do a long initial transient? Do you have problems with transient? If you run a really long transient, does it look like it's converging to a periodic steady-state?

Title: Re: PSS and pac analysis on comparator with internal hysteresis
Post by avlsi on Mar 5^th, 2013, 4:38am

Thanks for the reply.

I could fix the problem as one of the input in the analysis window should be only a numerical value.

After the PSS and PAC successful run, how should i plot Gain versus time.