[SI-LIST] Re: Radiating Ceramic Bulk Capacitors
- From: "Paradis, Daniel" <Daniel.Paradis@xxxxxxxxxx>
- To: "'jrbarnes@xxxxxxxxx'" <jrbarnes@xxxxxxxxx>,"Paradis, Daniel" <Daniel.Paradis@xxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Wed, 9 Apr 2003 14:31:09 -0400
John
I pretty much use them the way you describe in the first 3 paragraphs.
It's the scattered approach that causes me problems...
Thanks
-----Original Message-----
From: John Barnes [mailto:jrbarnes@xxxxxxxxx]
Sent: Wednesday, April 09, 2003 2:07 PM
To: Daniel.Paradis@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Radiating Ceramic Bulk Capacitors
Daniel,
I try to put a bulk capacitor on each power-supply voltage close to:
* Where it enters a card (or at the output of a linear regulator or
DC-DC converter that generates the voltage).
* Where it leaves the card, through a cable to a peripheral device
or a socket for a SIMM/DIMM or daughter/adapter card.
* Power hogs, such as microprocessors, memory modules, clock
generators, DC-DC converters, and linear regulators.
AND
* Otherwise scattered around the board, following the "coffee cup"
rule-- If you wave a coffee cup over your board, there should be at
least one bulk capacitor under it for each power-supply voltage in
that area.
John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
dBi Corporation
http://www.dbicorporation.com/
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