RE: [SI-LIST] : Broadside v edge coupled striplines

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From: Lai, Ricky (Eng Hou) ([email protected])
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.

Ricky Lai
Compaq Computer

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, January 19, 2001 1:26 PM
To: [email protected]
Cc: [email protected]
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
Signal Integrity
[email protected]
(512) 723-3592

> [email protected] 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
> BROADSICE-coupled
> > 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
> > [email protected]
> > (512) 723-3592
> >
> >
> >

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