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Design >> Mixed-Signal Design >> How to extract phase noise curve off spectrum
https://designers-guide.org/forum/YaBB.pl?num=1143464434

Message started by neoflash on Mar 27^th, 2006, 5:00am

Title: How to extract phase noise curve off spectrum
Post by neoflash on Mar 27^th, 2006, 5:00am

HI:

In measuring clock signal phase noise, we can use spectrum analyzer.

The output curve can be processed to get phase noise curve. However, the spectrum will be coved by the noise floor in large offset frequency.

How we extract the real phase noise from the output of spectrum analyzer?

Title: Re: How to extract phase noise curve off spectrum
Post by Richard Ward on Mar 29^th, 2006, 10:46am

Hi,
I tend to ignore the instrument noise floor and specify the
range of phase noise accumulation. A common standard
(for me) is 10kHz-100MHz range and I can measure the
circuit output (serdes-based) and get results of 700-800fs
from a "good" spectrum analyzer (which are believeable from
the simulations).

Not sure this helps you - but it's another point of view,
Richard