Re: [SI-LIST] : Decoupling caps selection

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From: Muhammad S. Sagarwala (msagarwa@san-jose.tt.slb.com)
Date: Fri Oct 27 2000 - 15:42:36 PDT


It is definitely dependent on the edge rates. If the decoupling strategy
you employ works only upto the switching frequency,
you would loose (attenuate/distort) the high frequency components which
sharp edges are made of. So make sure
the decoupling scheme used on your system works atleast upto the knee
frequency...

Muhammad
-----Original Message-----
From: Dilpreet Saini <DSAINI@altera.com>
To: SI List (E-mail) <si-list@silab.eng.sun.com>
Date: Friday, October 27, 2000 3:37 PM
Subject: [SI-LIST] : Decoupling caps selection

>Hi all,
> I was wondering if the selection of the decoupling capacitor of a circuit
is MAINLY governed by the edge rates of the switching signals or by the
frequency of their switching. I believe the answer is later cause all the
documentation that I have seen on the dcoupling cap selection so far do not
have any mention of the edge rates. Most of the capacitor manufacturer have
"Impedance Vs Frequency" charts in their specs/catalogs. I am assuming that
the Frequency that they are referring to is the frequency of operation of
the circuit. Any ideas/comments are greatly appreciated.
>
>Dilpreet
>
>
>
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