RE: [SI-LIST] : 1/2 oz copper on high speed boards

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Mon Apr 16 2001 - 12:35:22 PDT


Negligible. Unless your traces are foot-long and over. Than your trace DC
resistance will interact with your 75-Ohm terminations.

Especially if you use Thevenins across the board.

For your power considerations though you may want to study this issue more
closely.

Mike.

-----Original Message-----
From: Javin Olson [mailto:Javin.Olson@plexus.com]
Sent: Monday, April 16, 2001 09:48
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : 1/2 oz copper on high speed boards

I am working with a customer that is pushing for 1/2 oz copper for a
high speed board consisting of 2.5Gbps CML, 622Mhz LVDS, on down to
33Mhz processor speeds. I can see where moving to 1/2 oz copper will
not affect the high speed signals that much since most of the signal
will be on the surface of the high speed signal traces.

I am wondering though, how much, and what effect will the 1/2 oz copper
have on the normal TTL and CMOS signals running at 33-100Mhz?

--------------------------------------------
Javin Olson
Plexus Technology Group
Design Engineer
920-969-6171

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