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stb and ac analysis do not match?

Hi,Guys,I have some problem to understand why stb and ac do not match.When I run stb analyis in a loop,the phase starts from -180 and it increses to a positive value and gain curve is normal! When I run ac analysis ,it seems like that phase and gain curve are normal .Could someone tell me which one simulation is right?

Thanks any help in advacne

Frank Wiedmann over 12 years ago

It's very difficult to tell without seeing your schematics. However, it's normal that the phase starts at -180 degrees (or +180 degrees) in stb analysis (see http://www.designers-guide.org/Forum/YaBB.pl?num=1124688329).
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xianweng over 12 years ago

Thank you , Frank
I do not know how to attach a picture on this forum,so I attached it on the http://www.designers-guide.org/Forum/YaBB.pl?num=1352294950/0#0,pleasure click this link to look at the schematic
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