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Integrated Circuit Structures

IP.com Disclosure Number: IPCOM000091862D
Original Publication Date: 1968-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Weinberger, A: AUTHOR

Abstract

An FET photodiode detector is formed by using the sink of an MOS device as a photosensitive area. MOS device 10 acts as a Load for photosensitive diode 12 so that when light impinges on diode 12 the latter draws current causing a change in potential at the output terminal. This detector can be fabricated by using sink 14 of device 10 as the photosensitive area. Light impinging of sink 14 does not effect the substrate voltage. Thus, an array of such photosensitive areas can be employed on a single substrate without isolation between the areas. Inputs to device 10 from the diode 12 are logically indistinguishable from other inputs and therefore can be used in a network of gates to comprise an optically changeable logic network. The fabrication technique can also be used to make a read-only memory.

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Integrated Circuit Structures

An FET photodiode detector is formed by using the sink of an MOS device as a photosensitive area. MOS device 10 acts as a Load for photosensitive diode 12 so that when light impinges on diode 12 the latter draws current causing a change in potential at the output terminal. This detector can be fabricated by using sink 14 of device 10 as the photosensitive area. Light impinging of sink 14 does not effect the substrate voltage. Thus, an array of such photosensitive areas can be employed on a single substrate without isolation between the areas. Inputs to device 10 from the diode 12 are logically indistinguishable from other inputs and therefore can be used in a network of gates to comprise an optically changeable logic network. The fabrication technique can also be used to make a read-only memory. Application of an interrogation pulse to word line 16 diverts current from load device 18 into read device 20 to sense the presence or absence of photocurrent.

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