Re: [SI-LIST] : Diff clocks length matching

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Thu Apr 12 2001 - 10:27:39 PDT


Bill Owsley wrote:

> The purpose of the end result may have an effect on the requirement for
> matched length.
> For SI, +/- 5% may be close enough for a decent eye pattern.
> For EMI, that may still be an emission problem.
> ps. Can you get your simulator to show the effects on the sum of the diff
> signals for mis-matched pairs ?
> - Bill

+/- 5% of the edge transition time, is still significantly less than the
launch skew of a typical differential driver due to output imbalance,
package skew due to package routing asymmetry and connector skew.

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

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