[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

*** Serving Your Needs with Technical Excellence ***


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