[SI-LIST] Re: About common-mode
- From: "Knighten, Jim L" <JK100005@xxxxxxxxxxxxxxxx>
- To: Fu.Gerg@xxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 4 Nov 2003 11:21:36 -0500
Greg,
The term "common-mode" is regularly applied to both cases:
1. In the case of differential signaling, where the normal signal mode is
with each of the two conductors have equal and opposite polarities, the
common-mode refers to excitations where both conductors have the same
polarity.
2. In the case of single-ended signaling, the term common-mode usually
refers to excitation where the directions of the current on the signal
conductor and the current ground plane are the same.
These two cases are not the same, yet we use the same term for them.
Confusing, isn't it.
Regards,
Jim
________________________
James L. Knighten, Ph.D.
Teradata, a division of NCR http://www.ncr.com
17095 Via del Campo
San Diego, CA 92127
tel: 858-485-2537
fax: 858-485-3788
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Fu.Gerg@xxxxxxxxxxxx
Sent: Tuesday, November 04, 2003 12:13 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] About common-mode
hi,all:
I see a document to explain the common-mode as follows:
common-mode refers to signals that occur on both traces of a
differential signal pair or on both the single-ended trace and ground.
I have a question, where is the return path? Confused...
Thanks for your help in advance.
Best regards,
Greg
Mailto:fu.greg@xxxxxxxxxxxx
Inventec(ShangHai) Co.,Ltd.
NO.1295 Yishan Rd,Shanghai 200233,P.R.C.
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