Roger Allen Larson

US Patent:

45556237, Nov 26, 1985

Filed:

Dec 5, 1983

Appl. No.:

6/558099

Inventors:

Walter F. Bridgewater - Santa Clara CA
Robert E. De Caro - Hermosa Beach CA
Roger Larson - Fullerton CA
Llewellyn E. Wall - Irvine CA

Assignee:

Irvine Sensors Corporation - Costa Mesa CA

International Classification:

H01J 4014

US Classification:

250214A

Abstract:

A pre-amplifier located "at the focal plane" of a detector array is disclosed which uses MOSFET transistors operated in the "weak inversion" region to provide operational amplifier performance. The dimensions of certain of the transistors are designed to minimize noise amplification. Feedback resistance for the operational amplifier is provided by switched capacitance using MOSFET transistors as switches, thereby permitting adjustment of the amplifier gain. Implanted and non-implanted MOSFET transistors are used in the differential amplifier in such a way as to avoid the need for a biasing network.