Bypass Capacitors--An Interview With Todd Hubing:Positions I have taken in the past regarding bypass caps
have generated some considerable controversy. In addition,
Todd Hubing, et al, wrote an article (Footnote 1) on plane
capacitance that has, unfortunately, been widely misinterpreted.
Todd is an Assistant Professor in Electrical Engineering
at the University of Missouri-Rolla. He was the
keynote speaker at PCB Design Conference East last fall.
After the conference, he and I entered into an e-mail exchange
regarding his research and opinions regarding bypass
caps. My e-mails tended to be in the form of statements about
which I asked Todd to agree or disagree, and then to comment
on. The exchange is reprinted below in an “interview” format.
It has been edited for length, clarity and continuity, but not for
content. Todd’s responses, in particular, have not been edited.