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printing calculated out put noise from a pnoise simulation

rpanock

 I am trying to print out the results of a pnoise simulation of a vco.  it seems that the only way to do it it is from the calculator.  That optiononly lets you print out the phase noise in dbc/Hz.  I would like the output noise voltage or voltage squared.  Seems like their should be a way since it is calculated for plotting.

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  • Frank,

    As the Forum Guidelines suggest, please don't post on the end of an old thread. There's no need in this case as your question doesn't require anything from the earlier thread.

    To find the phase noise in dBc, plot the magnitude of the oscillator output (the same node you specified in the pnoise form) as magnitude, rms (on the direct plot form). Find the value at the 1st harmonic, and then if you calculate:

    20*log10(sqrt(noiseSummaryTotal)/harm1value))

    you'll get the phase noise amount. It's dividing the noise voltage by the RMS value of the appropriate harmonic (typically 1st harmonic).

    Regards,

    Andrew.

Reply

  • Frank,

    As the Forum Guidelines suggest, please don't post on the end of an old thread. There's no need in this case as your question doesn't require anything from the earlier thread.

    To find the phase noise in dBc, plot the magnitude of the oscillator output (the same node you specified in the pnoise form) as magnitude, rms (on the direct plot form). Find the value at the 1st harmonic, and then if you calculate:

    20*log10(sqrt(noiseSummaryTotal)/harm1value))

    you'll get the phase noise amount. It's dividing the noise voltage by the RMS value of the appropriate harmonic (typically 1st harmonic).

    Regards,

    Andrew.

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