[SI-LIST] Re: Jitter from Crosstalk

Ray -

We define random jitter as unbounded, truly Gaussian.  Since crosstalk in
two lines that are coherent is deterministic, the crosstalk in two
non-coherent lines will be no worse, if a different distribution.

Andrew Volk
Intel Corp.

-----Original Message-----
From: Ray Anderson [mailto:Raymond.Anderson@xxxxxxx]
Sent: Friday, May 17, 2002 1:24 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Jitter from Crosstalk




I've got a question on crosstalk to pose to the
aggregate wisdom of si-list.

In the problem's most simplistic form assume we have
two transmission lines (an aggressor and a victim).
The two lines are somewhat coupled.

Further assume that the aggressor line has a very
randomized signal on it (say a PRBS 2^31-1 pattern).

Also assume that the signal on the victim line is
completely non-synchronous with the aggressor signal.


Now for the question:

Is the jitter induced on the victim signal random in
nature if the aggressor signal approximates a gaussian
distribution in randomness ?

Since the signals are non-synchronous, they will be "sliding"
by each other in time and therefore the contribution to the
victim signal jitter will be random in time. This will cause
a somewhat 'periodic' contribution to the induced jitter. Is
this a deterministic component ?

So I guess the real question is, given the above assumptions,
is the induced jitter Rj, Dj, or a combination of both.


I'd be interested in hearing any opinions and/or references
to studies on the topic.

Thanks,

        Ray Anderson
        
        Sun Microsystems Inc.

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