[SI-LIST] Re: Even mode, common mode, and mode conversion

  • From: Chris Cheng <chris.cheng@xxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 25 Feb 2002 17:40:28 -0800

Classical definition of TEM mode propagation in an N 
line coupled transmission line requires waveforms
to be propagating in N orthogonal eigen-vectors
(instead of individual waveforms at each port).
It just happen in a two line transmission line case
the vectors are [1,1] and [1,-1] ejwt and sometimes
people refer the pair as even and odd respectively.

In current generic SI terms, it is sometimes
refered to a coupled N line transmission line system
where the victim is switching in the same direction
(even mode) as the aggressor or the opposite direction
(odd mode). Note, depends on the setup, sometimes the
waveform in the aggressor ports becomes meaningless
to simplify the analysis time.

Chris

-----Original Message-----
From: Doug Brooks [mailto:doug@xxxxxxxxxx]
Sent: Monday, February 25, 2002 9:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Even mode, common mode, and mode conversion



Gurus,

I've been following the thread on mode conversion and suspect I am not the 
only one with this question. Can someone explain, in layman's terms:

The distinction between even mode and common mode?
        between odd mode and differential MODE (not to be confused with 
differential traces)

And does the existence of differential traces add any complications to 
these distinctions?

Thanks for bringing the dummies along with you!

Doug Brooks


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