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Integrated Circuit With Return Path to Ground

IP.com Disclosure Number: IPCOM000084459D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Battista, MA: AUTHOR [+4]

Abstract

A monolithic integrated circuit structure provides a compact resistor network for circuits requiring a return path to ground. Because this integrated circuit utilizes both the P-type isolation region and base regions as a return path to ground, the structure does not require individual contacts and metallization at the ground terminals. This reduces the physical size and improves the manufacturing yield.

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Integrated Circuit With Return Path to Ground

A monolithic integrated circuit structure provides a compact resistor network for circuits requiring a return path to ground. Because this integrated circuit utilizes both the P-type isolation region and base regions as a return path to ground, the structure does not require individual contacts and metallization at the ground terminals. This reduces the physical size and improves the manufacturing yield.

The P-type base region extends to form the main body of each resistor. (See Fig. 1.) The positive end of the base region performs the desired circuit base function. The negative end, instead of being brought out to a metallic ground conductor through a contact hole, is diffused so as to extend into P+ isolation material. The isolation therefore serves as a return path to ground. To lower ground path resistance common to the resistors, the base region is formed so as to extend into the P+ isolation region (Fig. 1A). A schematic diagram of the circuit thus provided is shown in Fig. 1B.

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