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:
Jun. 17, 1997
Filed:
Nov. 14, 1994
Evan Ezra Davidson, Hopewell Junction, NY (US);
Francis Edward Bosco, Poughkeepsie, NY (US);
Charles Kyriakos Vakirtzis, New Windsor, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A pair of on-chip thermal sensing diodes are formed together and interconnected with a common cathode to form a differential sensing pair. A pair of precision resistors external to the chip generates two constant currents, one for each diode, with a ratio of one to the other on the order of 100 to 1. The precision resistor values are selected so that variations about the nominal values of metal and via resistances between the diode contacts and the chip contact pads (e.g. C4 contacts) are negligible compared to the precision resistor values. Leads, connected respectively to two pads on the chip, couple a differential output of the anode voltages of the diode pair to the input of a high impedance amplifier.