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

• From: Steve Corey <steve@xxxxxxxxxxxxxx>
• To: si-list@xxxxxxxxxxxxx
• Date: Tue, 26 Feb 2002 07:49:01 -0800

Actually, orthogonality of the eigenvectors is not necessary.  Linear
independence is sufficient.

-- Steve

-------------------------------------------
Steven D. Corey, Ph.D.
Time Domain Analysis Systems, Inc.
"The Interconnect Modeling Company."
http://www.tdasystems.com

email: steve@xxxxxxxxxxxxxx
phone: (503) 246-2272
fax:   (503) 246-2282
-------------------------------------------

Chris Cheng wrote:

> 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
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>
>
>
>

--

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:
http://www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu