Post processing shielding

Details Post processing shielding Post processing shielding

1994-02-23

1995-08-29

Picard, Leo P.

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174262, 174264, H05K 100

Patent

active

054462436

ABSTRACT:
A system and method for reducing coupled noise in a multilayer circuit board having signal lines disposed within a set of wiring channels on each of a plurality of the layers; and, a vias disposed within a set of via channels. According to a first embodiment, otherwise unused vias traverse the layers and are connected with otherwise unused signal lines to form electrical nets, thus reducing coupled noise throughout the module. In the context of the above-described environment, a method for reducing coupled noise includes the steps of determining the locations of unused ones of the wiring channels and unused ones of the via channels; providing shield lines disposed within the unused wiring channels and unused via channels; and, interconnecting the shield lines with one another and to a reference voltage by way of at least one terminating resistance.

REFERENCES:
patent: 4785135 (1988-11-01), Ecker et al.
patent: 4933743 (1990-06-01), Thomas et al.
patent: 5006918 (1991-04-01), Deutsch et al.
patent: 5012047 (1991-04-01), Dohya
patent: 5012213 (1991-04-01), Tsai
Havant GB, "Printed Circuit Card/Board Shielded Assembly", Research Disclosure, No. 285, p. 56, Jan. 1988.

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