[SI-LIST] Re: EMI simulation tools at PCB level
- From: Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>
- To: "'Charles Grasso '" <cgrassosprint1@xxxxxxxxxxxxx>, Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>, "'zhang_kun@xxxxxxxxxx '" <zhang_kun@xxxxxxxxxx>, "'si-list@xxxxxxxxxxxxx '" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 2 Dec 2004 23:12:44 -0800
You mean the =22 part ? :-D
Seriously, I know it is understandable and explainable but I want it to be
automatically predicted and simulated by a tool. It is easy to fix and patch
after the fact but I have yet to see a tool to tell me ahead of time the db
and peaks location. A bare PCB with a few "experimental traces" as in some
EMI papers, sure. A multi-boards system with chassis and spaghetti cables
come out ? Show me the money.
-----Original Message-----
From: Charles Grasso
To: Chris.Cheng@xxxxxxxxxxxx; zhang_kun@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Sent: 12/2/2004 10:31 PM
Subject: RE: [SI-LIST] Re: EMI simulation tools at PCB level
Chris - It would be *much* easier for you to contact some experienced
EMC
engineers - the phenomena you describe are understandabe and
explainable.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Chris Cheng
Sent: Thursday, December 02, 2004 5:13 PM
To: 'zhang_kun@xxxxxxxxxx'; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: EMI simulation tools at PCB level
I am sure the consumer product guys will laugh at my stupidity but I can
never design a PCB that will pass FCC B without a large metal cage
chassis.
I've always wanted to simulate why if I tighten the screw by one more
turn
on my door and my EMI gaskets compressed a little harder and the
signature
changed by 10 db. Or if I hang the cable this way or that way the
signature
changed by a few db. What I am trying to say is while EMI from PCB may
be
the source, the enclosure/environment the PCB is in seems to have a
bigger
impact on whether you are passing FCC than the PCB itself. Granted this
is
just from an incompetent designer like me who cannot ship an absolute
clean
PCB that can be wrapped in a plastic bag and passing FCC. Any simulation
tools that can help me ?
ps Is there any way I can receive messages from the list from outside
the US
without these =2 =22 ? I know the US or English language is not the
center
of the Universe so I appolgize in advanced.
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