[SI-LIST] Re: Common mode clock coupling

Doug,

As far as I can interpret you are OK if the length is
matched. But if there is enough length mismatch for
any significant time the clock transitions will sqew
and the signals will be differential for the duration
of the sqew.

Whether this causes a problem or not would depend
on how tightly coupled the lines were and how much
reflection could be tolerated in the design .

Kind regards
Martyn Gaudion
www.polarinstruments.com


At 11:11 27/09/01 -0700, you wrote:

>Suppose I have two clock lines that run parallel to each other for a
>significant distance (6" or 12"). They are completely synchronous (equal
>signal). Assume also that they are series (source) terminated.
>
>These two lines are (perfectly) common mode coupled (as opposed to
>differential). I have two questions:
>
>1. What are the cross-talk implications, if any?
>2. Are the cross talk implications different if they   are/are
>not   matched length?
>
>
>Thanks for any input
>
>Doug Brooks
>
>***********************************************************
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