[SI-LIST] Question on varying the coupling ratio on a differential pair
- From: "cookeway" <wcooke@xxxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 15 Jan 2007 22:54:41 -0000
Hi all,
I have a question concerning differential pair coupling ratios that
is causing some debate here in our design group. If a differential
pair with an impedance of 100 ohms connects through a backplane
connector and into a backplane such that the impedance is
consistently 100 ohms, but the coupling ratio of the return currents
on the adjacent planes versus the return current using the compliment
differential signal changes, will there be a reflection on the signal?
For example, if you have a strongly coupled differential pair of 100
ohms on your motherboard which goes through a connector to connect to
a loosely coupled 100 ohm differential pair on the backplane, is
there a reflection? My gut feeling is that the reflections caused by
the different coupling ratios would cancel each other out causing no
net reflection. Am I right in thinking this?
Thanks,
Wayne Cooke
Hardware Engineer, Zeugma Systems Inc.
Suite 250, 13571 Commerce Parkway, Richmond, BC, Canada, V6V 2R2
Tel: (604) 247-2828
Fax: (604) 247-3251
wcooke@xxxxxxxxxxxxxxxxx
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