Re: [SI-LIST] : Parallel Plate Capacitance for Bypass

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From: Ray Anderson (raymonda@ha1mpk-mail.eng.sun.com)
Date: Fri Mar 24 2000 - 14:46:54 PST


>
> Go to the AVX webpage and the American Technical Ceramics web
> pages. They have S-parameters which show that the smaller profile
> ceramics are good to above 1 Ghz.
>

The advertised s-parameters are only for the capacitor. Mount the
capacitor on a PCB with pads, pad escapes and vias to the planes
and the extra inductance from the mounting causes the resonant
frequency to drop. What is important is the mounted inductance,
not only the inductance of the part.

-Ray Anderson

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