EMC & Signal Integrity Engineer
PCB Development and Design Department
Voice : (408) 256-7956 T/L : 276-7956 Fax : (408) 256-0550=
10/29/97 05:11 AM
Please respond to owner-si-list@silab.Eng.Sun.COM @ internet
cc: si-list@silab.Eng.Sun.COM @ internet
Subject: Re: [SI-LIST] : Decoupling capacitor selection & placemen
How does everyone feel about power/ground distributed capacitance?=
Zycon originally developed ZBC2000 - a thin FR4 (.002") power/grou=
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 e=
power/ground core with 2750pf/sq in - as the next generation.
I have been doing work to predict the ability of both these produc=
to replace discrete capacitors in our customers boards and would l=
to hear some honest thoughts and feedback.
FYI - I'm an EE working at HADCO. I work with the electrical issue=
PWB - impedance, capacitance, layout, etc. - more or less in house=