The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> Pstb Analysis for SC CMFB https://designers-guide.org/forum/YaBB.pl?num=1191533499 Message started by analog2000 on Oct 4th, 2007, 2:31pm |
Title: Pstb Analysis for SC CMFB Post by analog2000 on Oct 4th, 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 |
Title: Re: Pstb Analysis for SC CMFB Post by tosei on Oct 6th, 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 |
Title: Re: Pstb Analysis for SC CMFB Post by analog2000 on Oct 6th, 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 |
Title: Re: Pstb Analysis for SC CMFB Post by tosei on Oct 8th, 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 |
Title: Re: Pstb Analysis for SC CMFB Post by analog2000 on Oct 10th, 2007, 3:34pm Hi, I am not using cmdmprobe analog2000 |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |