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Programmable Resistors

IP.com Disclosure Number: IPCOM000060565D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Favata, AF: AUTHOR [+5]

Abstract

An embedded resistor technique is disclosed in this article which offers a high level of reliability and programmability while keeping device area consumption to a minimum. General aspects of the disclosed resistor design technique are shown in the figures, and four interesting features unique to it are described below. 1) The resistor bed, as shown in the figures, is surrounded by ROI (recessed oxide isolation). This isolates it from neighboring resistor beds, thereby completely eliminating the danger of parasitic p-FET formation, enhancing reliability, and allowing unrestricted wirability across adjacent resistor beds. 2) The positive contact of the resistor is so designed as to maximize its area of contact, thereby compensating for contact depletion failure mechanisms at this contact.

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Programmable Resistors

An embedded resistor technique is disclosed in this article which offers a high level of reliability and programmability while keeping device area consumption to a minimum. General aspects of the disclosed resistor design technique are shown in the figures, and four interesting features unique to it are described below. 1) The resistor bed, as shown in the figures, is surrounded by ROI (recessed oxide isolation). This isolates it from neighboring resistor beds, thereby completely eliminating the danger of parasitic p-FET formation, enhancing reliability, and allowing unrestricted wirability across adjacent resistor beds. 2) The positive contact of the resistor is so designed as to maximize its area of contact, thereby compensating for contact depletion failure mechanisms at this contact. Provision is also made for inclusion of the larger positive contact at either end of the resistor, as dictated by device placement. 3) The negative contact, as shown in the figures, is designed purposely small, since there is no danger of contact depletion occurring at this contact. 4) Overall device size can now be reduced to a minimum by programming the resistor with the negative contact only, thereby optimizing the aspect ratio, L/W, and maximizing the amount of programmable resistance available per unit area. The resistor is programmable for all values up to its maximum length by simply positioning the negative contact correctly.

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