[SI-LIST] Capacitors and Anti-resonance

I started to use only 0.1uF decoupling caps on our latest designs.
This is to avoid the anti-resonance effect that occurs when using 2
different caps near each other.
The rule of thumb is to use the largest cap available for the package. 
So far I got good results, but I was wondering....

Is-there a simple way to determine the distance between 2 different
decoupling caps beyond which there is no anti-resonance effect?

In other words..
Say that I stick to this general rule of using only one cap.
It seems to me that there could be exceptions to that rule.
In the case of a high speed clock buffer for instance; 
I could need 0.0047uF instead of 0.1uF
If this clock buffer is located far from other parts of the design. 
Can I avoid anti-resonance?


Daniel Paradis
Staff Electrical Engineer
Digital Subscriber Networks

Scientific-Atlanta, Inc.
5030 Sugarloaf Parkway, ATL 1.3468
Lawrenceville, GA 30042
Tel: (770) 236-7896
Fax: (770) 236-2449




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