[SI-LIST] Re: Importance of Package Height

Istvan Novak Wrote:

> We still should not expect the capacitor vendors to give us L_attached,
but
> it works the other way around: if we know the internal geometry of the
> capacitor, for each connection geometry in our application, we could
> determine L_attached by field-solver simulations.  Or, if we have sample
> parts, we dont need to know the internal geometry of the capacitor,
> L_attached can be determined by measurements for each of our application
> geometries.
>
Dear Istvan:

From the above statements I have concluded that the preferred methods  for
determining L_attached consist of  field solver simulations and series
resonance measurements.

This thread has contained discussion of series resonant frequencies
(corresponding to zeros of board impedance),  but no mention of
parallel resonance (relating to poles in impedance expressions). It seems to
me that the parallel resonant frequencies can be ascertained via several
different techniques including analytical calculations, simulations, and
measurements.

I am very interested to know what is your recommended approach for
evaluating/treating parallel resonance when analyzing/designing
a power distribution system?

Thank you in advance for your reply.

Abe Riazi
ServerWorks








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