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Loading...Technical Report – Printed Circuit Board Decoupling Capacitor Performance For Optimum EMC Design
Bruce Archambeault, Ph.D.
Doug White
Personal Systems Group
Electromagnetic Compatibility Center of Competency
January 1999
Table of Contents
Introduction . 4
Decoupling Capacitor Performance Measurement Process . 4
Test Board Description . 4
Decoupling Capacitor Configuration Measurement Results . 6
PC Board Impedance 7
Source vs. Distributed Decoupling . 7
Quanity of Distributed Decoupling Capacitors (.01 uF only) 12
Quanity of Distributed Decoupling Capacitors (.01 uF and 10 pF) 12
Quanity of Distributed Decoupling Capacitors (.01 uF and 22 pF) 13
Quanity of Distributed Decoupling Capacitors (.01 uF and 330 pF) .. 32
Decoupling Around Board Edge Only 32
Resistive Decoupling Around Board Edge . 32
Emissions Around Board Edge . 32
Conclusions and Recommendations 32
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