Re[2]: [SI-LIST] : Decoupling capacitor selection & placemen

tderego@hadco.com
Wed, 29 Oct 97 07:43:46 EST

How does everyone feel about power/ground distributed capacitance?

Zycon originally developed ZBC2000 - a thin FR4 (.002") power/ground
core with a capacitance of ~500pf/sq in (usually 2 cores are used) -
as a decoupling capacitor replacement or adjunct.

HADCO and Polyclad have developed EmCap - a 0.004" Ceramic / FR4 epoxy
power/ground core with 2750pf/sq in - as the next generation.

I have been doing work to predict the ability of both these products
to replace discrete capacitors in our customers boards and would like
to hear some honest thoughts and feedback.

FYI - I'm an EE working at HADCO. I work with the electrical issues in
PWB - impedance, capacitance, layout, etc. - more or less in house SI.

Thanks!
Todd DeRego