RE: [SI-LIST] : trace width for clock routing- wider/narrower?

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From: Grasso, Charles (Chaz) (GrassC@LOUISVILLE.STORTEK.COM)
Date: Tue Mar 14 2000 - 10:39:30 PST


The skin effect will result in increased resistive
losses as one heads into the Twilight Zone.

Making the trace wider makes sense from that standpoint.

-----Original Message-----
From: Doug Brooks [mailto:doug@eskimo.com]
Sent: Monday, March 13, 2000 1:39 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : trace width for clock routing- wider/narrower?

Point well taken.
Do ANY rules of thumb apply up there?
Doug

  I've routed clocks on very wide lines specifically
>to keep the edge rates from rolling off due to skin effect.
>These were faster than "normal" clocks (up to 1.2 GHz) with
>GaAs drivers. Again points out the problems of a "rule of
>thumb". One persons clock frequency is not another persons
>clock frequency. As usual it all depends on the details.
>
>Jerry Johnson
>Senior Staff Engineer
>Teradyne Inc.

.
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See our updated message re in-house seminars on our web page
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Doug Brooks, President doug@eskimo.com
UltraCAD Design, Inc. http://www.ultracad.com

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