Re: [SI-LIST] : differential impedance calculations

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From: Charles Grasso (chasgra@msn.com)
Date: Wed Nov 01 2000 - 14:22:51 PST


Hello - There is an excellent presentation available for download called
"Differential Impedance finally made Simple" authored by Dr Bogatin that
should help answer this question.

Please goto http://www.ewh.ieee.org/rmcemc Click on Last Meeting and
follow the instructions for the presentation download.

Enjoy!!

Charles Grasso
Ansoft Corporartion
p: 303-666-1400
f: 303-666-1499
----- Original Message -----
From: "Gary Peterson" <Gary_Peterson@Emcore.com>
To: <si-list@silab.eng.sun.com>
Sent: Wednesday, November 01, 2000 12:50 PM
Subject: [SI-LIST] : differential impedance calculations

>
>
> I seem to recall Dr. Howard Johnson mentioning that impedance calculation
> formulas made assumptions (since closed-form solutions aren't possible).
>
> Can someone comment on assumptions made for the equation for differential
> impedance shown below? Seems to me that as traces get closer together,
the
> single ended impedance would be affected. When I calculate single-point
> values for differential impedance using Hyperlynx LineSim, I do see the
> single-ended impedance change when the spacing between the pair gets
small.
>
> Thanks,
>
> Gary Peterson
>
>
>
> (Embedded image moved to file: pic27894.pcx)
>
>

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