Method of Pre-Charging Logic Card (Decoupling) Capacitors
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
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.