Arthur Brown email (remove spam text)
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.
----- Original Message -----
From: Mark Peterson <CANNONTECH.COM> markp
To: <MITVMA.MIT.EDU> PICLIST
Sent: Tuesday, June 06, 2000 5:58 AM
Subject: [EE]: Filter Capacitors
> In many products, I see a large electrolytic capacitor in parallel with a
> small disc or dipped capacitor. Why is that done? Obviously, the pair
> does not act as a single large capacitor, or aonly a single one would be
> used. Just how does that arrangement work?
> Mark P
See also: www.piclist.com/techref/logic/dsps.htm?key=filter
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