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 PSS and PNOISE Analysis 

Last post Mon, Aug 19 2013 12:34 AM by winniewang. 2 replies.
Started by kapiljainwal 15 Aug 2013 12:28 AM. Topic has 2 replies and 375 views
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  • Thu, Aug 15 2013 12:28 AM

    PSS and PNOISE Analysis Reply

    I am simulating an Chopper stabilized folded cascode opamp. But I am getting som strange behavior at the output. First I am getting unnecessary zoroes in phase plot when I am doing AC analysis but on other machine circuit is showing proper output.

    Second I am getting some convergence issues when I am doing PSS and PNOISE analysis. and When I am resimulating the circuit Then it is showing some different results as compare to previous time out put.

    Please Help me if any settings problem is there or something else.



    • Post Points: 35
  • Thu, Aug 15 2013 1:25 PM

    • Tawna
    • Top 25 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 217
    • Points 5,775
    Re: PSS and PNOISE Analysis Reply

    Hi Kapiljainwal,

     We need more information to be able to assist you. 

    1. What version of spectre are you using?  The command  spectre -W   will give this info.

    2. The problem statement isn't very clear.   Please - one issue at a time.  Provide exact error messages.  Describe clearly the setup you are using, etc. 

    For questions like this, it may be best to contact Customer Support for assistance.


    best regards,


    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 5
  • Mon, Aug 19 2013 12:34 AM

    • winniewang
    • Not Ranked
    • Joined on Sun, Aug 18 2013
    • Posts 1
    • Points 5
    Re: PSS and PNOISE Analysis Reply
    More information please.
    • Post Points: 5
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Started by kapiljainwal at 15 Aug 2013 12:28 AM. Topic has 2 replies.