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:
Jan. 09, 2001
Filed:
Oct. 01, 1997
Alex Gusinov, Lexington, MA (US);
Abstract
A bandgap voltage reference circuit wherein a voltage change is induced across one element to compensate for the temperature-induced voltage change across another element. A stable voltage reference is realized across the series combination of the two elements. The circuit includes an operational amplifier, two transistors, a voltage divider and a non-linear temperature-dependent element. The operational amplifier has two input terminals and an output terminal. The voltage divider includes two resistor in series and is coupled to the operational amplifier output terminal. Each of the transistors has a collector corresponding to one of the operational amplifier input terminals, a base corresponding to one of the voltage divider resistor terminals, and an emitter coupled to a common voltage terminal. The non-linear temperature-dependent element is disposed between the voltage divider output terminal providing the lower voltage and the common voltage terminal. In one embodiment, the non-linear temperature-dependent element is a diode. In another embodiment, the non-linear temperature-dependent element is a bipolar junction transistor. The invention also relates to a method of providing a bandgap reference voltage.