[SI-LIST] Re: Power supply inductors and EMI beads

There are many articles on these subjects on the Internet. Search for them
on www.google.com

here are a few examples:

http://www.murata.com/emc/knowhow/pdfs/te15ey/18to21e.pdf

http://www.comm-omni.com/okaya/ok4-1.htm

http://www.omega.com/literature/transactions/volume2/analogsignal2.html

The subject (low noise design, EMI, grounding, power filtering, etc.) is
wide and multifacited. People have devoted books to EMI. low noise design,
grounding, power filtering, signal filtering, etc. so there is no real
answer to your question. You need to be more specific. What are your goals
in EMI and low noise design might be helpful for instance.

Steven Salkow
Lockheed Martin
3200 Zanker Rd
San Jose, CA 95134
(408) 473-4058
steven.salkow@xxxxxxxx
Fax (408) 473-3044


> -----Original Message-----
> From: Alex Achey [SMTP:alexachey@xxxxxxxxxxx]
> Sent: Thursday, May 22, 2003 1:50 PM
> To:   si-list@xxxxxxxxxxxxx
> Subject:      [SI-LIST] Power supply inductors and EMI beads
> 
> Hello all,
>    I'm a relatively new engineer still wet behind the ears with this EMI
> and noise stuff.  I'm trying to figure out where is and is not an
> appropriate place to put power choke coils, power filtering, and EMI
> beads.  I have a board I'm putting an FPGA on with some other stuff which
> generates a moderate amount of digital noise, along with my regulators to
> get my 12V input down to 5/3.3/1.5V.  Should I be putting a choke coil on
> the power supply + input only or the ground (-) input also?  Should I tie
> my signal ground to chassis ground with my mounting hardware?  Are EMI
> supression beads appropriate for both power and ground inputs from the
> supply?  I apologize if these are really basic or "dumb" questions but I
> can't seem to figure this out.
> 
>  Thanks, 
>    Alex
> 
> 
> 
> 
> 
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