FreeLists / si-list / [SI-LIST] Ferrite bead question

[Joel Brown <joel@xxxxxxxxxx>]

I often see recommendations in application notes for ferrite beads on DC 
power lines. Sometimes a particular P/N is specified and sometimes just 
an impedance is given.
Wouldn't I want to choose a ferrite bead that has the highest impedance 
possible at the frequencies of interest, and that the current rating and 
DC resistance are appropriate? Would the frequencies of interest be the 
fundamental switching frequency of the part and possibly the 3rd and 5th 
harmonics?
Thanks - Joel



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