RE: [SI-LIST] : Capacitor dielectric type

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From: Bob Weber (rweber@txc.com)
Date: Mon Nov 20 2000 - 06:11:27 PST


TK,

This will likely cause some discussion, but I avoid using NP0 or C0G
capacitors for bypassing because of their low ESR. Small value (1nF) X7R
capacitors have noticeable ESR (0.5ohm), but this is a good thing. It
provides a damping element to absorb the ringing that develops on the
power-ground planes due to parasitic resonances between the bypass
capacitors and the unavoidable inductance of the connections.

Bob W.

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Tae-Kwang Jeon
Sent: Thursday, November 16, 2000 6:47 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Capacitor dielectric type

Hello,

I'm trying to put multiple decoupling capacitos on my board mixing small and
large values in order to minimize the ESL and ESR.
What I'm wondering is when I use different types of dielectic for the
capacitors. For instance, I'm going to use 0.022uF X7R type and 470pF of
NPO type because NPO has the lowest ESR.

Does anybody know whether or not it's not a big deal in terms of mixed
dielectric material for high frequency decoupling?

Thanks,
TK

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