RE: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: Aubrey_Sparkman@Dell.com
Date: Fri Jan 14 2000 - 10:20:15 PST


Would it be appropriate to mention that for most applications, the best
reasons to not have 90 degree angles may be outside the realm of Signal
Integrity?

Aubrey Sparkman
Signal Integrity
Aubrey_Sparkman@Dell.com
(512) 723-3592

-----Original Message-----
From: Jeff Seeger [mailto:jseeger@appliedcad.com]
Sent: Friday, January 14, 2000 12:05 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : What's your favourite Screwy SI Concept?

Tom Dagostino wrote:
>
> Bending a wire keeps a uniform cross section. Putting a corner in a trace
> adds extra C at the corner from a larger area.
>
        And herein lies the arguement, I believe.

        Perhaps those who argue against "right angles" envision a
        geometry where the line has a squared corner both on the
        inside of the elbow and the outside.

        I would wager that those who claim no material effect are
        working with the usual CAD system/photoplotter geometry of
        a squared corner inside the elbow and a radiused one on the
        outside.

        An attempt at ascii art:

           "Right Angle" "Standard Practice"

               \ \ \ \
                \ \ \ \
> > > )
                / / / /
               / / / /

        HTH,

-- 
 
      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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