[SI-LIST] Re: Stack up for EMI reduction,plane resonance and u-str ip radiation etc etc

From: "Charles Grasso" <cgrassosprint1@xxxxxxxxxxxxx>
To: <zhang_kun@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
Date: Thu, 12 Feb 2004 18:53:03 -0800

Dear Zhangkun,

You may be interested in work done by Bruce Archambleut(IBM) that says
pretty much the same thing. you can download the presentation slides from
http://www.ieee.org/rmcemc - Archives =2003- May 20th.


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Zhangkun
Sent: Thursday, February 12, 2004 5:42 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Stack up for EMI reduction,plane resonance and
u-str ip radiation etc etc


Dear all:

I have reviewed the mails in this thread. The following is my points.

a)From my view, I am caring about the EMI of PCB. Very small common mode
noise will give rise to critical EMI problem. In my experience, the common
mode noise is proportional to the impedance of power delivery systems. This
has been verified by measurement and simualtion.

b)I have done some measurement. No matter have many caps are placed on the
boards, the impedance of PDS beyond 200MHz will not get better. It should be
clarified that now I do not use cap less than 1000pF. When the caps less
than 1000pF is used, there will be a lot of antiresonance. This is also
verified by simualtion and measurement.

c)I have not studied the interaction between signal in trace and noise in
plane. However, I have treated one case, in which the noise in plane
seriously affect the signal in trace. After we eliminate the noise in plane,
the signal become very good.

Best Regards

Zhangkun
2004.2.13
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References:
- [SI-LIST] Re: Stack up for EMI reduction,plane resonance and u-strip radiation etc etc
  - From: Zhangkun

[SI-LIST] Re: Stack up for EMI reduction,plane resonance and u-str ip radiation etc etc

Other related posts: