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Bypass Capacitors to Improve Power Distribution on a Fused Card

IP.com Disclosure Number: IPCOM000040524D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Diegert, DB [+details]

Abstract

Printed circuit card and board assemblies are often constructed with voltage and ground planes in order to provide low impedance distribution of power to electronic modules mounted on the cards. To maintain this low impedance between the card and the board, a number of card connector pins are assigned to each voltage level and are selected so that they are distributed across the width of the connector. However, some systems require that card current be measured or fused. Constriction of current through a device, such as a fuse, introduces a series inductance into the distribution circuit, which defeats the purpose of using power planes and multiple connector pins. Voltage regulation at the electronic module suffers as a result. The use of bypass capacitors restores a low impedance connection between the card and the board.