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Pstb Analysis for SC CMFB (Read 4215 times)

analog2000 Junior Member Offline Posts: 21	Pstb Analysis for SC CMFB Oct 04^th, 2007, 2:31pm Hi, Could anyone help me with pstb analysis of sc cmfb for a diff amp. I have been trying to run pstb but pss fails for a differntial sc gain. The gain stage uses a diff amp with sc cmfb ? thanks a lot Best Regards analog2000
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HdrChopper Community Fellow Offline Posts: 493	Re: Pstb Analysis for SC CMFB Reply #1 - Oct 6^th, 2007, 9:48am Hi, When you say tje pss fails for a differential sc gain, what do you exactly mean: it does not converge or it is giving you unexpected results? Regards tosei
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analog2000

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Re: Pstb Analysis for SC CMFB
Reply #2 - Oct 6^th, 2007, 2:37pm

HI there,
It fails to finish the pstb analysis. The pss analysis is finished, however, there were convergence warnings. ?
I tried relaxing the accuracy requirements, changed the pss algorithm from balanced to shooting, but of no avail. I also tried changing the clock frequency and the input frequency for my sc gain stage. No luck yet
thanks

analog2000

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HdrChopper Community Fellow Offline Posts: 493	Re: Pstb Analysis for SC CMFB Reply #3 - Oct 8^th, 2007, 7:37pm Hi, I assume you are using the cmdmprobe from the analoglib. If this is the case, make sure the probe is properly connected according to the type of analysis you are trying to run (-1 for diff mode, 1 for cm mode). I saw convergence problems due to this in the past. tosei
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analog2000 Junior Member Offline Posts: 21	Re: Pstb Analysis for SC CMFB Reply #4 - Oct 10^th, 2007, 3:34pm Hi, I am not using cmdmprobe analog2000
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