[SI-LIST] Re: About Common-mode insertion loss of differential mode S-parameter
- From: Antonis Orphanou <aorphanou@xxxxxxxxxxxxxxxxx>
- To: "zhanglub@xxxxxxxxxx" <zhanglub@xxxxxxxxxx>, "peng_shao@xxxxxxxxxx" <peng_shao@xxxxxxxxxx>
- Date: Thu, 29 Dec 2011 15:20:33 +0000
You can observe the power balance (careful this is a lossy system) that can
link column by column your single ended or mixed mode matrices. This is a good
way to see a relationship between the relevant s parameters elements.
Sent from Samsung tablet
Lucian Zhang <zhanglub@xxxxxxxxxx> wrote:
Thank you.
But I still want to know how to define the Bandwidth of differential
transmission channel
from its mixed-mode S-paramter matrix.
Also, if S21CC is bigger, will the SI of diffrential signal decrease more
obviously?
"Shao, Peng" <Peng_Shao@xxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
2011-12-28 23:35
To
Lucian Zhang <zhanglub@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx"
<si-list@xxxxxxxxxxxxx>
cc
Subject
[SI-LIST] Re: About Common-mode insertion loss of differential mode
S-parameter
There is not certain relationship among: S21CC, S21DD, S21DC, or S21CD.
The distribution of common mode EM field is different from the
differential mode field.
So, you assumption is correct, the loss of common and differential mode is
different.
Shaopeng
AE Consultant Mentor Graphics Electronic Technology Co., Ltd.
Tel: +86-10 - 5930 4050
Cell: +86-136 1105 7707
Fax: +86-10-6808 0319
E-mail: peng_shao@xxxxxxxxxx
Address: RM1512, CanWay Building, No.66 NanLiShi Lu, Beijing, China
100045
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lucian Zhang
Sent: 2011年12月28日 21:30
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] About Common-mode insertion loss of differential mode
S-parameter
Hi, All,
I am puzzled about the effect of S21 (Common to Common) of differential
mode S-parameter.
Assume I have a pair of differential transmission lines, its 3dB BW of
S21(Diff to Diff) is 10GHz, and that of S21(Common to Common) is 7GHz. Now
the question is what the real 3dB BW the channel is when it transmit
differential signal.
In my think, when the Common-mode insertion loss is bigger, it does not
mean that the S21(Common to Diff) or S21(Diff to
Common) will be bigger. So, the common-mode noise should not MUST affect
the differential signal.
Thank you.
Lucian
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