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 AC analysis  

Last post Mon, Oct 14 2013 3:29 AM by vnaren. 2 replies.
Started by kapiljainwal 15 Aug 2013 02:59 AM. Topic has 2 replies and 567 views
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  • Thu, Aug 15 2013 2:59 AM

    AC analysis Reply

    I am simulating Folded cascode opamp and when I am doing AC analysis the phase and agmitude graph is coming opposite, that means when i am takine 20dB Gain (Vout/vin) then it is showing opposite graph with negative values. but when i am doing 20dBGain(Vin/Vout) it is coming properly. I am not getting what is the problem. Please help.

     

    • Post Points: 35
  • Tue, Aug 27 2013 1:33 PM

    Re: AC analysis Reply

    I doubt anyone could help you without some more details. Most likely your circuit is not really working - it sounds as if it is attenuating rather than having gain. Maybe your DC operating point is incorrect? 

    Andrew.

    • Post Points: 5
  • Mon, Oct 14 2013 3:29 AM

    • vnaren
    • Not Ranked
    • Joined on Sat, Aug 10 2013
    • Chennai, Tamil Nadu
    • Posts 2
    • Points 10
    Re: AC analysis Reply

     Hi kapiljainwal,

     You are doing a loop stability analysis on the opamp connected in unity gain buffer mode I presume?

     If this is the case then reverse the polarity of the lstb voltage source probe you are using.

    Regards,

     Naren

    • Post Points: 5
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Started by kapiljainwal at 15 Aug 2013 02:59 AM. Topic has 2 replies.