[SI-LIST] : diff pair routing rules

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From: Javin Olson ([email protected])
Date: Tue Jan 23 2001 - 08:14:49 PST

All,

I have a couple of general SI/routing rules I would like to get
information on,
and thought this may be the forum to do so.

1. What is the general rule of trace to trace spacing of a differential
pair signals (positive trace to negative trace, NOT pair to pair
spacing)?
PECL and LVDS, are different spacings recommended?

2. When routing a differential pair to pins that are a few rows apart,
is it best to keep the diff. pairs close as long as possible and then
route straight to the pin; or should the net that is shorter be
(mini) wrapped so that the diff pair lengths are exactly matched? What
is
more important, keeping the diff pair nets routed togother, or breaking
off the short route near the end of the trace to wrap it and make it as
long as the long route net?

Any thoughts?

Thanks you for your comments.

Javin Olson
Plexus Technology Group
Digital Design Engineer

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