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. 15, 2001
Filed:
Nov. 18, 1999
Ronald N. Dow, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A reference voltage output by a bandgap voltage reference circuit is formed by summing an amplified voltage that has a positive temperature coefficient with a base-to-emitter voltage that has a negative temperature coefficient. The amplified voltage is formed by amplifying a difference voltage &Dgr;V,. Variations over temperature of the reference voltage are reduced by increasing the magnitude of the difference voltage &Dgr;V,. By increasing the magnitude of the difference voltage &Dgr;V,, a smaller gain can be used to form the amplified voltage. By utilizing a smaller gain, less of the error associated with the difference voltage &Dgr;V,is present in the amplified voltage.