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 Plotting CMRR and PSRR in cadence virtuoso 

Last post Fri, Dec 20 2013 10:31 AM by Andrew Beckett. 1 replies.
Started by MicroShab 01 Dec 2013 09:30 PM. Topic has 1 replies and 5328 views
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  • Sun, Dec 1 2013 9:30 PM

    • MicroShab
    • Not Ranked
    • Joined on Fri, May 10 2013
    • Posts 5
    • Points 70
    Plotting CMRR and PSRR in cadence virtuoso Reply

    Hi,

     

    I am designing an Instrumentation amplifier using differential difference amplifier. I want to calculate CMRR and PSRR.

    Please help me how to plot them using cadence virtuoso. 

    • Post Points: 20
  • Fri, Dec 20 2013 10:31 AM

    Re: Plotting CMRR and PSRR in cadence virtuoso Reply

    You could use the xf analysis in spectre. You'd have three sources at the input - one representing the common mode signal, one representing the differential signal (so that could be between the two inputs, with the other source providing the offset), and then the source supply.

    With the xf analysis, you'd specify the frequency sweep and the output of the circuit. Then after simulation, you could use the direct plot form and find the transfer function from each of the three sources to the output from your single simulation run.

    Regards,

    Andrew.

    • Post Points: 5
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Started by MicroShab at 01 Dec 2013 09:30 PM. Topic has 1 replies.