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Reducing Crosstalk in Coplanar PC Signal Lines

IP.com Disclosure Number: IPCOM000041224D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gupta, JC: AUTHOR [+3]

Abstract

In a fanout printed circuit (PC) signal wiring arrangement, the coplanar PC signal lines are enclosed in individual crosstalk shielding loops. Each loop has as members thereof a pair of ungrounded separate PC lines on each side of and coplanar with an individual one of the PC signal lines. The arrangement has been found to enhance mitigation of crosstalk between signal lines without substantially changing the characteristic impedance of the signal lines than is the case when conventional shielding techniques are used. (Image Omitted)

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Reducing Crosstalk in Coplanar PC Signal Lines

In a fanout printed circuit (PC) signal wiring arrangement, the coplanar PC signal lines are enclosed in individual crosstalk shielding loops. Each loop has as members thereof a pair of ungrounded separate PC lines on each side of and coplanar with an individual one of the PC signal lines. The arrangement has been found to enhance mitigation of crosstalk between signal lines without substantially changing the characteristic impedance of the signal lines than is the case when conventional shielding techniques are used.

(Image Omitted)

By way of example, in one arrangement, the PC signal lines S in signal plane S1 of PC board laminate L are surrounded by commonly shared coplanar shielding PC lines 1. Lines 1 are connected to plated thru holes (PTHs) 2. One end of the PTHs 2 is connected to a common PC strip 3 (thereby commonly short circuiting line 1) located in a plane P1 parallel to S1. The other ends of the PTHs 2 are connected to the integral ground or reference plane P2 associated with signal plane S1. As such, the arrangement forms multiple shortening loops, each of which encloses one of the signal lines S.

Disclosed anonymously.

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