RE: [SI-LIST] : topics for discussion

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From: Aubrey_Sparkman@Dell.com
Date: Wed Dec 01 1999 - 15:10:16 PST


Since TEM and TM modes are mentioned on the same page as Differential
signalling, I would like to request some clarity when Differential
signalling is discussed.
Why?
Well, you can have Differential signalling when two separate signals are
received by a differential amplifier or comparator even though the two
signals may travel via two separate single ended microstrip transmission
lines.
Isn't it also Differential signalling when you have a single signal
traveling down a balanced transmission line? IE, twin lead, co-planar
structures. Hmmmm. Different effects, Different problems, Different
solutions. Lots of different stuff...

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

-----Original Message-----
From: Jim Freeman [mailto:freeman@broadcom.com]
Sent: Wednesday, December 01, 1999 2:08 PM
To: si-list
Subject: [SI-LIST] : topics for discussion

Hi All,
    Adrian talked about basic topics for discussion. Here are a few
ideas.

1. TEM and TM modes in transmission lines or for EMC. What are the
assumptions that drive one or the other?

2. Differential signalling - broadside coupling or edge coupling,
differential mode ground and common mode ground, EMC implications for
different types of coupling.

3. Methods for describing more accurately the behavior of transmission
lines and return paths under changing frequency conditions.
Incorporation of dielectric losses in the simulation and/or
calculations. Incorporation of the harmonics of the digital signal with
corresponding changes in impedance to better emulate dispersion of the
digital signal that gives rise to jitter/skew.

These are just a few of the more esoteric concepts that I would like to
see discussed.

Thanks
Jim Freeman

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