See Microchip's AN823, Analog Design in a Digital World.  It has
some fairly informative things to say about the selection of
bypass capacitors, including frequency responses of some typical
values.

BTW, no one ever told me this, per se, but it's something I'm
coming to realize bit by bit:  Learn, use, and love the application
notes sections of the major manufacturers.  Microchip, TI, Nat
Semi, and many many others all maintain large libraries of app
notes on every topic under the sun.  Many of these notes will
detail exact methods for doing whatever it is you want to do.

Mike H.
>Not being an EE by education.....
>
>I always thought capacitors as simple bulk storage devices, use some big
>ones to filter out the ripple on power supplies and bunches of lil ones on
>chips for adding the last "umph" when they switch and draw more current.
>
>But ive seen and read stuff about using a mix of big and small for better
>frequency response.  But can someone explain exactly what that means?  If
>you have a circuit running at 20 MHz do you need to worry about a cap that
>responds at 100MHz?  I just am not so clear on this (frequency response of
>a cap).  Sorry if this is too basic of a question.
>
>-JJ
>
>
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