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PSS analysis: using variable for beat frequency

frasheed

Hello,

I have a ring oscillator design and I am running PSS and pnoise analysis using ADE L. For calculating the phase noise and jitter I want the PSS beat frequency to be calculated from my oscillator output i.e. I don't want to manually enter any numerical value for beat frequency. I tried to calculate the frequency by running transient simulation and then adding that variable in beat frequency option in pss analysis but it gives me error that it is not valid variable or expression. Can anyone give me hint how to this ? I am using ADE 6.1.6.500.10

Thanks

Parents

  • PSS should find the oscillator frequency anyway - it's only really to help the algorithm find the frequency more efficiently. So if you have control variables used to set which mode it's in, you can adjust your estimate. It shouldn't be absolutely required though.

    The phase noise and jitter should then be measured relative to whatever frequency it finds.

    So I'm not sure you have to do anything...

    Regards,

    Andrew.

Reply

  • PSS should find the oscillator frequency anyway - it's only really to help the algorithm find the frequency more efficiently. So if you have control variables used to set which mode it's in, you can adjust your estimate. It shouldn't be absolutely required though.

    The phase noise and jitter should then be measured relative to whatever frequency it finds.

    So I'm not sure you have to do anything...

    Regards,

    Andrew.

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