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PSS and pac analysis on comparator with internal hysteresis (Read 2096 times)

avlsi Community Member Offline Posts: 91 singapore	PSS and pac analysis on comparator with internal hysteresis 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?
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Geoffrey_Coram

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Re: PSS and pac analysis on comparator with internal hysteresis
Reply #1 - 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?

If at first you do succeed, STOP, raise your standards, and stop wasting your time.

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avlsi Community Member Offline Posts: 91 singapore	Re: PSS and pac analysis on comparator with internal hysteresis Reply #2 - 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.
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