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. 25, 1993
Filed:
Dec. 13, 1991
Andrew Neely, Phoenixville, PA (US);
Richard L Fussell, Berwyn, PA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A novel on-chip temperature sensing circuit includes a differential voltage source which comprises a plurality of branches each of which is provided with temperature sensitive transistor means. The differential output from the differential voltage source is coupled to the inputs of a high gain differential amplifier and the outputs from the high gain differential amplifier are connected to a second stage differential amplifer and one of the branches of the second stage differential amplifier is coupled to a high gain transistor amplifier which is connected to an output pin on the semiconductor chip so that the signal at the output pin is a noise tolerant voltage indication of the temperature of said semiconductor chip which may be monitored during actual online operations. A hysteresis feedback may be coupled between one of the outputs of the differential amplifiers to provide a hysteresis feedback loop and rapid switching of the second differential amplifier.