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Design >> Mixed-Signal Design >> How to simulate the stability of sc-cmfb using hsp
https://designers-guide.org/forum/YaBB.pl?num=1183301928

Message started by didibabawu on Jul 1^st, 2007, 7:58am

Title: How to simulate the stability of sc-cmfb using hsp
Post by didibabawu on Jul 1^st, 2007, 7:58am

Because I can't use spectre,I need to simulate the stability of sc_cmfb circuit using hspice.
I break the cmfb point and add the equivalent load at the output of the cmfb, then using the dc point with cmfb to doing ac analysis to see the phase margin.I'm not sure whether the method is right. Can anyone give me some suggestion? Thank you very much.

Title: Re: How to simulate the stability of sc-cmfb using
Post by boe on Jul 2^nd, 2007, 3:59am

Since you use AC analysis, I suppose you have a continuous-time CMFB...
If you open the loop you have to make sure that you still get the same operating point...

BOE