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Modeling >> Behavioral Models >> Time-domain jitter with flicker noise in veriloga
https://designers-guide.org/forum/YaBB.pl?num=1209050668

Message started by weber8722 on Apr 24^th, 2008, 8:24am

Title: Time-domain jitter with flicker noise in veriloga
Post by weber8722 on Apr 24^th, 2008, 8:24am

Hi,

in many advanced behavioral models jitter is included with Gaussian distributed random numbers, but that includes usually no flicker (1/f) noise. Generally, flicker noise increases long-term jitter more, so adding additional randomness, not every period, but in longer time steps could be a way of implementing it. Has anybody a jitter model with flicker noise or detailed references with models on this topic?

Bye Stephan

Title: Re: Time-domain jitter with flicker noise in veriloga
Post by Peruzzi on Oct 6^th, 2008, 10:51am

Stephan,

Did you ever try out your idea for modeling 1/f noise? Your approach seems worth a try.

You could run it for "long enough" time, save and window the output samples, and do some spectral analysis on them in Matlab. Tweak and repeat till you get the desired 1/f break, then look for a deterministic formula to generalize it.

I'm curious to see how it worked for you.

Thanks,

Bob P.

Title: Re: Time-domain jitter with flicker noise in veriloga
Post by weber8722 on Oct 7^th, 2008, 7:13am

Hi Bob,

whatr I tried some weeks ago was using a CMOS inverter for jitter creation e.g. in Spectre transient noise analysis, and using AC noise sources for white and 1/f noise. It looks not bad, but is probably not best wrt efficiency.

Bye Stephan