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:
Dec. 22, 1998
Filed:
Apr. 18, 1997
Applicant:
Inventor:
Roger Levinson, Sunnyvale, CA (US);
Assignee:
Exar Corporation, Fremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323316 ; 323314 ; 323317 ; 327396 ;
Abstract
A reference voltage generating method and circuit is disclosed where the output can be programmably calibrated for minimum temperature drift. Output calibration is performed by adjusting a value of resistance of a resistor in a band-gap circuit. Digitally programmable switches are used to incrementally reduce or increase the value of the target resistor. The control circuit according to the present invention is also designed such that it tracks variations in process and temperature.