[SI-LIST] Re: Let's talk laminate induced skew

Bill,
Good Questions!  Could I request that those who have data also share
their "confidence level" or std dev and / or the results of their Guage
R&R study?

Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592

The Greatest Pleasure in Life is Doing what People say can't be done...

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Bill Dempsey
Sent: Thursday, January 18, 2007 6:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Let's talk laminate induced skew

Hi All,
=20
I've been reading a couple of these papers published on laminate induced
skew of trace pairs.  I know that several contributors to this forum are
the authors of those papers and I would like to dig into this problem a
little bit more.
I am getting ready to build a backplane for a customer that has 40" of
trace and mulitple pairs running between two connectors.  They would
like to reach 6.5Gbps on these traces but when I look at some of these
published figures for just p-to-n skew I am worried about being able to
have a reasonable eye opening at the receiver (without EQ or
pre-emphasis).
=20
Can I take a poll from the community and ask who else has measured data
for laminate skew? What did you see?
How many people out there are running 40" or more at greater than 3.125
Gbps using FR4 (or similar material) with success?  Did you compensate
for laminate skew?

Lastly, how much does a Rogers 4350 dielectric exhibit this tendency?
=20
Thanks,
Bill


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