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Measurements >> Phase Noise and Jitter Measurements >> Questions on Ken's PLLjitter.pdf
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Message started by weber8722 on Apr 24^th, 2008, 7:41am

Title: Questions on Ken's PLLjitter.pdf
Post by weber8722 on Apr 24^th, 2008, 7:41am

Hi,
I read the great paper, but wonder a bit on p.45 showing the Matlab script for phase-noise vs f.
Basically you need to do a psd calculation on the cumulated phase, which is in the example basically a huge vector (2GHz * 60ms), starting with something like 0,6.28...,12.5....,....
However, why the psd takes only 512 samples from this huge vector? The maximum frequency should be 1/60ms*512 = 8.5kHz, which does not fit to the graphs.
A second also important question, does anybody has this in SKILL for Cadence ADE calculator - or just directly the calculator expression?

Bye Stephan