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How to extract phase noise curve off spectrum (Read 2066 times)

neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	How to extract phase noise curve off spectrum 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?
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Richard Ward

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California

Re: How to extract phase noise curve off spectrum
Reply #1 - 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

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