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Oct 22nd, 2020, 5:50am
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Relationship between phase jitter and K-cycle jitter. (Read 1955 times)
Homer
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Relationship between phase jitter and K-cycle jitter.
Sep 16th, 2015, 10:21am
 
Hi,

I'm trying to simulate the phase jitter of a VCO within certain integration frequency range. And it seems there is no direct phase jitter result could be plot in pnoise simulation. But there is K-cycle period jitter. So if I increase K number untill the jitter number doesn't change anymore, can I think this K-cycle jitter is the phase jitter?

I need this number for a Serdes jitter budget. Normally I will use a spreadsheet to calculate the phase jitter of which the input is phase noise result of pnoise simulation.  But I do want get this number from spectre directly.

Thanks!
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Frank Wiedmann
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Re: Relationship between phase jitter and K-cycle jitter.
Reply #1 - Sep 17th, 2015, 2:37am
 
If you are simulating with noisetype=pmjitter, then Jee might be what you are looking for. Jc for large k values should be the same as Jee multiplied by sqrt(2) (because the duration of a period is influenced by two edges).
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