[SI-LIST] Re: Traces don't cause EMI - really?
- From: "Charles Grasso" <cgrassosprint1@xxxxxxxxxxxxx>
- To: <MikonCons@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 22 Oct 2003 20:40:06 -0700
For the first time I disagree (tongue in cheek)
with Mike...
Mike you said : Knowledge of ALL these phenomena (and their prevention) is
what establishes
the need for SI Engineers.
I say Knowledge of ALL these phenomena (and their prevention) is what
establishes
the need for EMC Engineers.!! :-D
LOL
Chas
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of MikonCons@xxxxxxx
Sent: Wednesday, October 22, 2003 4:10 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Traces don't cause EMI - really?
In a message dated 10/22/2003 3:32:48 PM Pacific Standard Time,
tom@xxxxxxxxxxxxx writes:
In my experience, which I'm sure is not as broad as many who are
contributing to this thread, is the cables were the big problem. Any noise
on the ground, power or signals that were connected to the cables was
radiated. This was much higher than anything on the board.
************
The above is a true statement for many (if not most) cases as radiated
emissions increase with the square of frequency for common-mode radiation,
but not
for all EMI problems (either extenally detected or internally
experienced....with resultng unacceptable performance). Loop
circuits/antennas radiate only in
proportion to frequency and are therefore not as big a problem at higher
frequencies (where most of this discussion applies). As we all know, the
generation
of CM noise involves several other causes that have been discussed at length
on this forum.
Knowledge of ALL these phenomena (and their prevention) is what establishes
the need for SI Engineers.
Mike
Michael L. Conn
Owner/Principal Consultant
Mikon Consulting
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