piclist 2000\06\06\183348a >
Thread: Filter Capacitors
face BY : Erik Reikes email (remove spam text)

FYI This has to do with the ESR of the caps.  For an ideal capacitor model,
a large cap would work even better for high freq. than a small cap.  In
practice there is an internal resistance that makes large electrolytics
good for damping low freq. (near DC) noise, and small ceramic caps better
for getting rid of high frequency noise.

At 02:16 PM 6/6/00 -0700, you wrote:
>hi Paul
>The same way as multiple capacitors on a circuit board. Interference can be
>from one chip to the next via the supply, so you put a capacitor across the
>supply pins of each chip as close to the chip as possible.
>The large capacitor can remove some ripple from the supply while the smaller
>capacitor deals with spikes the value and where placed play apart in this.
>As does the path of tracks around the board.
>Regards Art
>{Original Message removed}

In reply to: <001701bfcffc$70cc2b00$c5c6fea9@q9q7m0>
See also: www.piclist.com/techref/logic/dsps.htm?key=filter
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