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:
Nov. 10, 1987
Filed:
Sep. 05, 1985
Donald R Cargille, Venice, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
An improved infrared sensor is provided which is of the type which scans across a spatial region and detects infrared energy radiating from a celestial body and in which an input electronic signal is produced in response to the detected infrared energy, wherein the improvement comprises: amplifier circuit means for providing an amplified output signal in response to the input electronic signal; threshold detection circuit means for detecting when the output electronic signal reaches a prescribed threshold level substantially below a saturation level of said amplifier circuit means said threshold detection circuit means comprising a thresholding circuit for providing a turn-on signal when the output signal reaches the prescribed threshold level; and feedback circuit means for providing a feedback signal for limiting the input electronic signal provided to said amplifier circuit means, said feedback circuit means comprising a feedback amplifier circuit responsive to the turn-on signal, such that the feedback signal is provided when the output signal substantially reaches the prescribed threshold level; wherein a feedback loop comprising said threshold detection circuit means and said feedback circuit means is characterized by a feedback ratio selected to substantially dampen unwanted oscillations in said feedback loop.