[SI-LIST] Re: Jitter transfer vs. accumulation

George

I have a quick question.  You said:

"The VCO RMS jitter is bounded, and so is the PLL RMS jitter.  The RJ
distribution takes on a true Gaussian waveform."

My meager understanding of this is that Rj is by definition unbounded. And the 
presence of a true Gaussian distribution (when all other deterministic 
components have been subtracted out) is an indication of this unboundedness. 
And yes, theoretically it will approach infinity at infinite time. However, 
because the random component is so low, it "seems" to be bounded within a 
specific BER confidence level.  Which is why we have repeatability in 
measurements.  My contention is that Rj is much smaller than most people 
believe or are able to measure, and that it is low probability deterministic 
noise components that dominate the jitter spectrum. Unfortunately, these can 
also tend to have near-gaussian distributions, mucking up the measurement 
apparatus.

If what I say above is correct, then what you describe above is truly unbounded 
jitter, taking on a Gaussian distribution.

Do you agree?


best regards,

Scott




Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC


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