LNA gain calculation in Spectre

Discussion in 'Cadence' started by Maz, Feb 18, 2006.

  1. Maz

    Maz Guest

    Hi, a very basic question. I am trying to determine the gain of an
    source degenerate LNA using Spectre. I understand gain is just the
    Vout/Vin, however, since I am dealing with AC signals, when I try to
    solve for the gain using the Spectre calculator, by doing
    (average(Vout/Vin)) then trying to have the dBm value, I get infinity.
    I can clearly see that my input signal is amplified when I do a
    transient analysis, but just can't seem to determine the gain using the

    Any suggestions would be most appreciated.

    Maz, Feb 18, 2006
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  2. Are you doing an AC analysis? If so, why are you using "average"?

    A few more details are really needed. What analyses are you doing, and what is
    the exact expression you have in the calculator.


    Andrew Beckett, Feb 21, 2006
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