On the effectiveness of decoupling capacitors in reducing EM radiation from PCBs

Author

Daijavad, Shahrokh ; Heeb, Hansruedi

Author_Institution

IBM T. J. Watson Res. Center, Yorktown Heights, NY, USA

fYear

1993

fDate

9-13 Aug 1993

Firstpage

330

Lastpage

333

Abstract

The effectiveness of using decoupling capacitors (decaps) between power and ground planes in a typical PC or workstation printed circuit board (PCB) is studied from an electromagnetic-compatibility (EMC) point of view. By examining the radiation from the board, the effects of the total number of decaps, the placement of decaps, and lead inductances are investigated. The novelty of the present studies is that they focus directly on electromagnetic radiation as opposed to the more traditional investigation of decaps by only examining their equivalent impedances

Keywords

capacitors; electromagnetic compatibility; electromagnetic interference; interference suppression; microcomputers; printed circuits; workstations; EM radiation reduction; EMC; PC; decoupling capacitors; electromagnetic radiation; electromagnetic-compatibility; ground planes; lead inductances; personal computer; printed circuit board; workstation; Capacitors; Conductors; Dielectric constant; Dielectric materials; Electromagnetic radiation; Frequency; Impedance; Inductance; Resonance; Surges;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 1993. Symposium Record., 1993 IEEE International Symposium on

Conference_Location

Dallas, TX

Print_ISBN

0-7803-1304-6

Type

conf

DOI

10.1109/ISEMC.1993.473717

Filename

473717