[SI-LIST] Re: Pk-Pk jitter

It would sure be nice if everyone would adopt the concept of "total =
jitter" at a specified bit error rate, as per the definitions in T11.2 =
MJSQ. I get this question all the time and there is no good answer. =
Peak-to-peak depends entirely on how long you measure it. Extrapolation =
based on separation into random and deterministic jitter is a far more =
repeatable and meaningful measure. Start asking the vendors what they =
mean by "peak-to-peak" and how it should be measured, and maybe =
eventually they'll catch on. =20

Art Porter
Agilent Technologies.=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Hal Murray
Sent: Saturday, December 22, 2007 1:43 AM
To: SI List
Cc: Hal Murray
Subject: [SI-LIST] Pk-Pk jitter


>     The vendor often provides PK to PK jitter parameter of PLL, but as
> we know, a reference clock on board will be feed to PLL via ASIC
> package and a input IO buffer, so we how to do simulation to get
> reference clock jitter requirement. could you help to give simulation
> methodology? thanks!=20

What does Peak-to-peak mean in this context?

If the distribution is Gausian (which is the usual assumption), then the =

tails go on forever.  It's just a matter of how long you wait.

Is there an implied cutoff at 6 sigma or something like that?  I think =
that=20
would make Pk-Pk a useful description.

Is the typical distribution actually Gaussian?  All sorts of things get =
more=20
interesting if it isn't quite Gaussian.


--=20
These are my opinions, not necessarily my employer's.  I hate spam.



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 =20



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