On Wed, Jun 04, 2003 at 09:34:18AM +0200, Norbert Hoppe wrote:
> When selecting parallel caps, it is important to remember that as the larger
> value capacitor goes inductive, the smaller value cap is still capacitive. 
> At a particular frequency, a LC circuit is developed between the 2 caps.
> An infinite impedance could be generated with no decoupling benefit provided.
> When this occurs, single-capacitor decoupling is all that one can use 
> for this application.

actually - if you look at ESL graphs for multilayer SMD caps - you will
see it depends much more on case size than on capacitance.
So the 100n tends to win.
This quote I think may be  older wisdom for thruhole components. 
john


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