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Printed Circuit Card Design

IP.com Disclosure Number: IPCOM000053077D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12

Publishing Venue

IBM

Related People

Authors:
Jones, NG Kershaw, JJ Zimmerman, RJ [+details]

Abstract

In current printed circuit card technology, the card includes a plurality of power planes and signal planes. Plated through holes (PTHs) are provided which extend from front to back and which receive pins or leads from components, such as circuit modules. Additional plated through holes are provided which extend from front to back and which serve as vias for wire routing, engineering changes (ECs) and as holes for internal test probing (ITP). A large number of holes are empty and unused in the total standard matrix. As a result, valuable card real estate is taken up which limits the signal plane wiring capability and capacity.