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 stb and ac analysis do not match? 

Last post Wed, Nov 7 2012 5:33 AM by xianweng. 2 replies.
Started by xianweng 06 Nov 2012 07:20 AM. Topic has 2 replies and 1650 views
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  • Tue, Nov 6 2012 7:20 AM

    • xianweng
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    stb and ac analysis do not match? Reply

     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

     

    • Post Points: 20
  • Wed, Nov 7 2012 1:36 AM

    • Frank Wiedmann
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    • Muenchen, Bavaria
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    Re: stb and ac analysis do not match? Reply

    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).

    • Post Points: 20
  • Wed, Nov 7 2012 5:33 AM

    • xianweng
    • Top 500 Contributor
    • Joined on Sun, Jan 1 2012
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    Re: stb and ac analysis do not match? Reply

     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

    • Post Points: 5
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Started by xianweng at 06 Nov 2012 07:20 AM. Topic has 2 replies.