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. 07, 2002
Filed:
Dec. 08, 2000
Mitsutoshi Sugawara, Cupertino, CA (US);
NEC Electronics, Inc., Santa Clara, CA (US);
Abstract
A voltage reference generating circuit for providing voltage references substantially less than the typical 1300 mV, with a controllable thermal coefficient. By forcing equal-valued currents through two semiconductor junctions having disparate junction areas, a voltage differential is developed, as is a current proportional to the voltage differential. The voltage differential, and a current proportional to the voltage differential, have positive thermal coefficients. A third semiconductor junction is biased from a third current source and bridged by a resistor pair so as to synthesize a Thevenin-equivalent voltage equivalent series resistance. The equivalent voltage has a negative thermal coefficient. By forcing a current that is equal to the proportional current through the equivalent resistance, a reference voltage, equal to the sum of the Thevenin-equivalent voltage plus the voltage drop across the Thevenin-equivalent resistance, is created.