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Method of Pre-Charging Logic Card (Decoupling) Capacitors

IP.com Disclosure Number: IPCOM000035415D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28

Publishing Venue

IBM

Related People

Authors:
Myers, WV Simonetty, RL [+details]

Abstract

It is desirable to be able to replace a faulty logic card without otherwise disturbing system operation. Logic cards contain voltage-to-ground decoupling capacitors which draw large current surges when voltages are first applied. These surges can reach hundreds of amperes for a duration of a few microseconds. Such surge currents will cause a dip in bus voltages which can lead to logic errors. These currents can also cause pitting of connector contacts. The currents also cause radiated electrical noise which may affect the operation of adjacent logic.