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:
Aug. 22, 2000
Filed:
Aug. 11, 1998
George F Diniz, Liberty, NC (US);
Ronald B Gray, III, Greensboro, NC (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
CMOS reference structures (e.g., voltage, current and resistance structures) are provided that are substantially insensitive to temperature, supply voltages and track fabrication processes. The structures include a V.sub.t -referenced source, a sensor and a summer. The source generates a source voltage and a feed-forward current that may have an error term and the sensor generates a feedback current that has a correction term that substantially offsets the error to stabilize a sum current. In different structure embodiments, voltage, current and resistance references are responsive to the stabilized sum current. The source, sensor and summer are preferably realized with MOSFETs whose channel width-to-length ratios are chosen to enhance the temperature insensitivity of the references.