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:
Jul. 03, 2001
Filed:
Oct. 18, 2000
Jerry L. Doorenbos, Tucson, AZ (US);
David M. Jones, Tucson, AZ (US);
Texas Instruments Tucson Corporation, Tucson, AZ (US);
Abstract
A temperature curvature compensation technique and circuit can be realized through the generation of a temperature curvature compensation voltage provided by measuring the difference between the base-emitter voltage V,of two different transistors operating at two different temperature coefficient quiescent currents. This voltage difference measured between two such transistors results in a scaled voltage that is representative of the temperature curvature of the base-emitter voltage V,of a transistor, and which can then be summed to the bandgap reference output to provide a temperature compensated, bandgap reference voltage. The above method can be carried out in an amplifier circuit configured to receive and sum the temperature curvature compensation voltage and the bandgap reference output voltage into the temperature compensated, bandgap reference voltage. In addition, the summing of the temperature curvature compensation voltage and the bandgap reference output voltage may be realized through the application of a dual differential pair amplifier configuration which operates as a g,source. Further, scaling of the respective input voltages for each differential pair can be provided by the amplifier circuit. Moreover, the dual differential pair amplifier may be incorporated into a buffer amplifier configuration to receive a bandgap reference voltage and provide a buffered output or, integrated with a bandgap reference circuit directly into an amplifier circuit.