“There
are a large number of people that use and/or recommend the use of multiple
capacitors of different values. My recommendation is don't! The
problem with this approach is that the different value capacitors produce an
anti-resonance, or cross-resonance (which produces an impedance peak).
Not a desirable result! For those still considering the use of different
value capacitors I would suggest that you look at the Bruce Archambeault and Clayton
Paul papers referenced below. The Bruce Archambeault paper in particular gives measured values of
decoupling effectiveness, using a network analyzer.”
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