Browse Prior Art Database

Discrete Wire Impedance Control Method

IP.com Disclosure Number: IPCOM000049756D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Sanborn, MA: AUTHOR

Abstract

Ground wires 10 are used to keep the impedance of active discrete wires 12 as close as possible to the printed wire impedance for computer circuit modules so that the circuits perform without error.

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Discrete Wire Impedance Control Method

Ground wires 10 are used to keep the impedance of active discrete wires 12 as close as possible to the printed wire impedance for computer circuit modules so that the circuits perform without error.

The ground wires are only needed for active wires longer than a critical length L, and when there are only a few active wires, less than N, running together in the channel.

Ground paths 10 are provided for an orthogonal grid of wires in the channels between the chips 14 on the surface of the module. Each wiring channel is divided into segments. A ground wire 10 is installed in a particular location only if there are any segments of its path, where less than N wires which are longer than the critical length L, are present. Obviously, if there are no wires present, it would not be installed.

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