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Measurements >> Phase Noise and Jitter Measurements >> About Phase Noise of HIGH Q oscillator
https://designers-guide.org/forum/YaBB.pl?num=1208399868

Message started by walkingsun on Apr 16^th, 2008, 7:37pm

Title: About Phase Noise of HIGH Q oscillator
Post by walkingsun on Apr 16^th, 2008, 7:37pm

The dominant part of phase noise of High Q oscillator, for example xtal, is the AM noise, instead of PM noise???
:o

Title: Re: About Phase Noise of HIGH Q oscillator
Post by chenyan on Apr 23^rd, 2008, 12:29am

can you explain your question in detail?

Title: Re: About Phase Noise of HIGH Q oscillator
Post by walkingsun on Apr 25^th, 2008, 9:04pm

From the pnoise(modulated) simulation of spectreRF,

For ring or LC oscillator, the most is the PM noise. It does match the theroy of cyclo-stationary noise, by ken et.
But for xtal oscillator, the AM noise is more than PM noise.

Is it because of xtal's chararistic of HIGH Q ???