Community RF Design Frequency multiplier phase noise simulation and how to get...

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Frequency multiplier phase noise simulation and how to get raising/falling edge phase noise contributions separately

maaz2020 over 1 year ago

Hi,

I have a frequency multiplier driven circuit (x2) and would like to plot the phase noise for one edge only (as if I used sampled jitter). I have read the thread in

https://community.cadence.com/cadence_technology_forums/f/rf-design/27259/simulating-frequency-multiplier-phase-noise-in-pss-qpss-pnoise-qpnoise

in which it is concluded that the correct way for PSS + pnoise simulation is to use sweep=relative (rel-hr=2 in my case). This is available in noisetype=timeaverage, therefore cannot plot separately raising or falling edge phase noise.

I assume noisetype=sampled (jitter) is not the correct tool here, as it will ignore one rising and one falling edge of the output waveform in the PSS period.

So what is the correct way of getting separate raising/falling edges contributions?

Thanks

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Andrew Beckett over 1 year ago

You could use sampled jitter and then plot the edgePhaseNoise - does that do what you want?

Andrew
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Andrew Beckett over 1 year ago

You could use sampled jitter and then plot the edgePhaseNoise - does that do what you want?

Andrew
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maaz2020 over 1 year ago in reply to Andrew Beckett

Hi Andrew,

I don't think that's accurate as the jitter simulation takes one raising edge and falling edge only, respectively, and ignores the other two, so I get very low phase noise
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