The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 1990
Filed:
Aug. 14, 1989
Robert N Sato, Palos Verdes Estates, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A capacitive feedback transimpedance amplifier 10 comprises a differential amplifier constructed of GaAs transistor Q.sub.1 and Q.sub.2 and has an input coupled to the output of an infrared detector 12 and an output expressive of the detector signal integrated over a predetermined interval of time. The amplifier has a transistor Q.sub.0 coupled to the input for coupling the input periodically to a predetermined voltage potential and a transistor Q.sub.9 coupled to the output of the amplifier for simultaneously periodically coupling the output to a predetermined voltage reference, thereby initializing the amplifier at the beginning of an integration period. A load is coupled between an amplifier output terminal a source of amplifier power. The load includes a resistor having a first terminal coupled to the amplifier output terminal and a second terminal coupled to a first GaAs load transistor. The first load transistor is serially coupled to a second load transistor. A gate terminal of each of the first and the second load transistors is coupled to the amplifier output terminal.