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Testing Procedure for Mercury Filled Boards

IP.com Disclosure Number: IPCOM000045351D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Chainer, TJ: AUTHOR [+2]

Abstract

Aligning a capacitor array across the cavities of a mercury-filled board permits the automated scanning of the cavities to ascertain which cavities are properly filled.

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Testing Procedure for Mercury Filled Boards

Aligning a capacitor array across the cavities of a mercury-filled board permits the automated scanning of the cavities to ascertain which cavities are properly filled.

A Josephson junction integrated package may use a mercury-filled cavity board to make thousands of interconnections between package parts. The Hg level must be measured to insure that each cavity is filled within tolerance. This technique uses thin film technology to fabricate a three-terminal array (1 or 2 dimensions) of capacitors on two parts which are placed on either side of the cavity board.

Fig. 1 is a schematic showing detail of one cavity and capacitor in cross- section. Fig. 2 is a diagram of a portion of a capacitor plate array (one set of plates). A three-terminal capacitance bridge may be used to minimize stray capacitance.

To measure a cavity array board, the capacitor array is aligned with a subsection of the board, and the array capacitors (1, 2, 3...n) are sequentially scanned by addressing logic 4, and measured by a measuring device 5, which may be a three-terminal capacitance bridge connected by coaxial cable. Each subsection is similarly aligned and measured. The data can be stored so that the cavities which are not filled within tolerance can be refilled or trimmed.

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