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How to measure settling time of a differential opamp using spectreRF?

Discussion in 'Electronic Design' started by Count, Dec 22, 2003.

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  1. Count

    Count Guest

    Hi, I have a fully differential opamp using a switched capacitor CMFB.
    I am able to perform a DCOP and AC analysis using PSS and PAC analysis
    respectively. But I have a problem with the simulator to find out the
    settling time of the opamp. My testbench for the settling time
    analysis is the same as Figure 1 of
    http://www.dessent.net/resume/ee240-dessent.pdf .
    The problem I have with the traditional transient analysis is that the
    CMFB has not settled down to the periodic DCOP. I tried running a PSS
    first followed by the traditional transient analysis but the simulator
    can't seem to work as the way as I want. Please suggest some ways.
    Thanks a bunch!
     
  2. CFoley1064

    CFoley1064 Guest

    Hi, I have a fully differential opamp using a switched capacitor CMFB.
    What's your simulation doing with DC input bias currents? Or are you using an
    "ideal" op amp? Could that be part of your problem?

    Good luck.
    Chris
     
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