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Low-inductance-circuit-apparatus-with-controlled-impedance-cross-unders-and-connector-for-connecting-to-backpanels

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Details

Inventors: Gulbranson, Glenn J.; Young, Steven J.; Kenealey, Gerald W.;
Assignee: Ceridian Corporation (Minneapolis, MN)
Primary Examiner: McGlynn; Joseph H.
Assistant Examiner:
Attorney, Agent or Firm: Kinney & Lange

Circuit apparatus comprises an integral structure of first and second multilayer wiring board portions and a flexible circuit portion. The wiring board portions each have at least circuit trace planes, ground planes and insulator planes. The flexible circuit portion includes at least one signal trace plane and at least one ground plane separated by at least one insulator plane; the singal trace plane of the flexible circuit portion being integral with a signal trace plane of each of the wiring board portions, the ground plane of the flexible circuit portion being integral with a ground plane of each of the wiring board portions, and the insulator plane of the flexible circuit portion being integral with an insulator plane of each of the wiring board portions. Selected ones of a plurality of electric contacts are connected to selected ones of the circuit traces of the circuit trace plane of the flexible circuit portions; others of the contacts being connected to the ground plane. A pin connector is conencted to the plurality of contacts and is arranged to electrically connect selected circuits traces and the ground plane of the flexible circuit portion to an interconnect backpanel, thereby electrically connecting the wiring board portions to the backpanel with minimum inductance.

DETAILED DESCRIPTION The present invention is directed to a rigid/flex printed wiring board comprising an integral structure of at least first and second multilayer wiring board portions connected together by an integral flexible circuit portion.
The wiring board portions each have at least circuit trace planes and ground planes, and usually power planes, separated by insulator planes.
The flexible circuit portion includes at least one signal trace plane and at least one ground plane separated by at least one insulator plane; the signal trace plane of the flexible circuit portion being integral with a signal trace plane of each of the wiring board portions, the ground plane of the flexible circuit portion being integral with a ground plane of each of the wiring board portions, and the insulator plane of the flexible circuit portion being integral with an insulator plane of each of the wiring board portions.
Selected ones of the circuit traces of the flexible circuit portion are connected to selected ones of a plurality of electric contacts; others of the contacts being connected to the ground plane and/or power plane of the flexible circuit portion.
A mating connector connects the plurality of contacts to a backpanel.
The mating connector may be a plug-type connector, or a pressure-type connector.
The connector electrically connects the wiring board portions to input/output connections of a backpanel, with small signal loops and minimum inductance.
Additional signal trace and ground planes may be added to the flexible circuit portion, and the flexible circuit portion may also include a power plane.

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