Browse Prior Art Database

Programmable Coplanar Flexible Circuit

IP.com Disclosure Number: IPCOM000037370D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Arndt, SF: AUTHOR [+3]

Abstract

Disclosed is a method that customizes a generic flexible circuit design for specific connector applications. For ease of precious metal plating, all contact pads are electrically common in the generic design. The customizing process then isolates the circuits. As an additional feature, good electrical performance is achieved in a single layer flexible circuit.

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Programmable Coplanar Flexible Circuit

Disclosed is a method that customizes a generic flexible circuit design for specific connector applications. For ease of precious metal plating, all contact pads are electrically common in the generic design. The customizing process then isolates the circuits. As an additional feature, good electrical performance is achieved in a single layer flexible circuit.

The coplanar flexible circuit 1 of Fig. 1 consists of an array of contact pads 2 wired to a second set of pads 3 with circuit traces 4. Shielding lines 7 run between circuit traces 4 and pads 2 and 3 and are connected to the commoning bars 5. The shielding lines provide impedance control and noise reduction. All pads 2 and 3 are connected to commoning bars 5 at each end of the flex circuit by tie strips 6 to facilitate precious metal plating which is required for non- soldered contact interfaces. The generic flexible circuit 1 is completed by adding the required protective coating (not shown).

A method for programming the flexible circuit 1 is shown in Fig. 2. Signal connections are created by isolating the signal lines 10 from the commoning bars 5 by holes 11 that are drilled or punched through the tie strips 6. The circuit traces 4 where the holes 11 are not made, become reference lines 12 that remain connected to the commoning bars 5. Further, holes 13 are drilled or punched in the commoning bars 5 to segment the commoning bars 5 into two or more reference levels. S...