jitter test in PLL using oscilloscope?

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liambarry

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could someone analyse why an oscilloscope with 12.5G bandwidth and 50GS/s can detect the ps level jitter? How it works?
 

I think if you use memory feature of your scope, you can observe the jitter over a long period.
 

by sampling over and over, you get a time scale that is smaller than what you would expect. i.e. a 50 GHz scope should only show you 1/50GHz time steps...but you can do better with the equivalent time sampling...a math trick
 

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