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How to calculate periodic jitter from a spectrum of a signal

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andy1

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periodic jitter

I am trying to find a function that can calculate the periodic jitter given a power spectrum such as captured from a spectrum analyzer.

For example, I have a 1.25GHz clock that is being FM modulated by another signal running at 1MHz. I can capture the power spectrum of the 1.25GHz on a spectrum analyzer. From the power spectrum, how do I calculate how much the 1.25GHz is being modulated in term of mUI or ps?

Is there a equation I can use to calculate?
 

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