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Noise Reduction Through Decoupling Techniques in Multi-Layered Printed Circuits

IP.com Disclosure Number: IPCOM000059036D
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Fitzgerald, FC [+details]

Abstract

While past efforts to reduce the noise level in multi-layered printed circuit cards and boards has had beneficial results, new sources of such noises have just been discovered. One of these has been found to be due to switching currents that are directed through inter-power impedances by signal lines. It has been found that such noises are reduced substantially by redefining the sequence of power and signal layers in a multi-layered printed circuit so that signal lines are located immediately between the power planes to which they are referenced, i.e., there is no intervening power plane.