piclist 2000\06\06\145620a >
Thread: Filter Capacitors
www.piclist.com/techref/logic/dsps.htm?key=filter
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face BY : David VanHorn email (remove spam text)



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At 11:38 AM 6/6/00 -0700, Peter Schultz wrote:
>Dave,
>You absolutely right, it will not save a bad layout, but that is what people
>think.
>We have oscillation on this board, let put more filtering, isn't that sounds
>familiar ?
>Peter


Oh yeah!!

Worst is where I see them added!  Like putting a cap to ground (some
arbitrary point in the ground system) from a signal line, to "smooth it
out"... Grrr. Now the driver needs much more current on each transition,
and the problem is worse.

Resistance in series solves this problem, but it's not so convenient to
implement usually. (Tip: high speed clock lines should always have a
resistor at the source. Even if later you choose the value to be zero,
though likely 100 ohms will be better)



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