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Measurements >> Phase Noise and Jitter Measurements >> Relationship between phase jitter and K-cycle jitter.
https://designers-guide.org/forum/YaBB.pl?num=1442424086

Message started by Homer on Sep 16^th, 2015, 10:21am

Title: Relationship between phase jitter and K-cycle jitter.
Post by Homer on Sep 16^th, 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!

Title: Re: Relationship between phase jitter and K-cycle jitter.
Post by Frank Wiedmann on Sep 17^th, 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).