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Measurements >> Phase Noise and Jitter Measurements >> PSS+PNoise question
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Message started by xuel on Mar 1^st, 2007, 1:15am

Title: PSS+PNoise question
Post by xuel on Mar 1^st, 2007, 1:15am

I use pss+pnoise to simulate the noise of a switching circuit, in pnoise setup, choose jitter as noise type.
And I get a result of 10mV integrated noise. The question is is this value rms-noise or peak-noise?

Title: Re: PSS+PNoise question
Post by Ken Kundert on Mar 1^st, 2007, 6:47pm

It's got to be RMS. Peak is not defined for Gaussian noise.

-Ken

Title: Re: PSS+PNoise question
Post by xuel on Mar 4^th, 2007, 7:49pm

from the equation (19) on page 8 of "Modeling Jitter in PLL-based Frequency Synthesizers", the edge-to-edge jitter is calulated as:
Jee=sqrt(var(nv(tc)) / (dv(tc)/dt)
if var(nv(tc)) is rms noise, Jee should be rms jitter? I am puzzled.

Title: Re: PSS+PNoise question
Post by Ken Kundert on Mar 5^th, 2007, 3:51pm

Yes, J_ee is RMS jitter.

You might want to update you version of that paper. Eqn (19) is no longer on page 8, and the equation you give is not Eqn (19).

-Ken