[SI-LIST] Re: Decoupling capacitors
- From: "mittalr@xxxxxxxxxx" <mittalr@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 17 May 2002 12:30:24 -0400 (EDT)
On a slightly tangential topic. Have you ever wondered the need for 100pf caps.
Everyone just seems to sprinkle them as a safety measure but I see no need for
them because
- the IC by itself will have about 50-100pF. I checked with many IC guys and
the ICs where you really need decoupling are generally big enough to have that
much decoupling on-chip.
- On top of this you have inter-plane caps.
I have seen many of my designs get away with no 100pF caps. I would use 1nF and
0.1uF, rather than 100pf, 10nF and 0.1uF. Anyone have any other experience...
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