Browse Prior Art Database

Crosstalk Elimination

IP.com Disclosure Number: IPCOM000097641D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Atwood, LW: AUTHOR

Abstract

In high-speed memory systems a serious problem is presented by crosstalk of inductive coupling between parallel coordinate drive conductors. The arrangement shown eliminates this coupling by providing mutual cancellation of induced signals in adjacent conductors.

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Crosstalk Elimination

In high-speed memory systems a serious problem is presented by crosstalk of inductive coupling between parallel coordinate drive conductors. The arrangement shown eliminates this coupling by providing mutual cancellation of induced signals in adjacent conductors.

Each memory drive line X1... X4 is formed into a series of loops, one for each memory plane P1... P4. Some of the loops are arranged to carry current in a clockwise direction (marked -) and others are arranged to carry current in a counterclockwise direction (marked +). The inductive coupling between two like polarity loops in two given conductors opposes and cancels that between two loops of unlike polarity. Advantage is taken of this and cancellation is attained by providing in any two conductors as many loops of unlike polarity as there are loops of like polarity. For example, conductors X1 and X3 both have + loops in planes P1 and P4, but X1 has + loops in planes P2 and P3 while X3 has - loops in these planes. The same condition exists for any combination of the conductors X1... X4.

The chart at the right represents the pattern of the conductors X1... X4 through the four planes. This pattern is identical to that shown in Table 3 of the article A Load Sharing Matrix Switch by G. Constantine, Jr. in the IBM Journal of Research & Development, July 1958, at page 204, and may be expanded in the manner described in that article. Other self cancelling patterns which may be employed are...