From: Lai, Ricky (Eng Hou) (Ricky.Lai@compaq.com)
Date: Sat Jan 20 2001 - 06:48:55 PST
SI list should be a site for professional discussion, not for joking. I
don't think your comment about Compaq is just "fun".
At Compaq, we do understand the differences between boardside vs edge
couplings and do our analysis accordingly.
From: Aubrey_Sparkman@Dell.com [mailto:Aubrey_Sparkman@Dell.com]
Sent: Friday, January 19, 2001 1:26 PM
Subject: RE: [SI-LIST] : Broadside v edge coupled striplines
You have pointed out good ways to reduce those two factors, not eliminate
them, right? Do you have manufacturing data to how much reduction in
And CPW is an Edge-coupled system, right?
And I hope everyone realizes my comment about Compaq and Sun was made in
And I do know how to spell Broad Side, even if Outlook does not.
> Aubrey_Sparkman@Dell.com wrote:
> > Thanks for that correction. Isn't the difference is really in
> > manufacturing, not physics? An EDGE-coupled diff pair is
> more uniform
> > because the pattern is etched in the same process. The
> > diff pair is etched at two different times and additionally
> has to be
> > mechanically aligned for lamination. This adds two
> additional error terms
> > to the accuracy of your BROADSICE-coupled diff pair that
> the EDGE-coupled
> > diff pair does not have. So IMHO, you should really have a
> packing density
> > problem before you consider using BROADSICE-coupled traces.
> > But if you are doing work for Compaq or Sun, you should use
> > BROADSICE-coupled diff pairs whenever possible. :-)
> > Aubrey Sparkman
> > Signal Integrity
> > Aubrey_Sparkman@Dell.com
> > (512) 723-3592
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