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:
Feb. 14, 2006
Filed:
Jul. 14, 2003
Paul M. Henry, Tucson, AZ (US);
Wade A. Leitner, Tucson, AZ (US);
Paul M. Henry, Tucson, AZ (US);
Wade A. Leitner, Tucson, AZ (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A reference circuit includes a band-gap core, two current sources, and an amplifier circuit that are arranged in cooperation. The band-gap core circuit is biased by current that is supplied from a local power supply via the first current source. The second current source shunts the excess away from the band-gap core circuit in response to a control signal. The control signal is provided by the amplifier circuit, which is arranged to monitor the signals in the band-gap core circuit. The feedback loop that is formed with the amplifier circuit is compensated with a capacitor that is not referenced to the local power supply. The first current source can be further improved by cascading. The reference circuit has excellent characteristics for use in switching applications, where the local supply is perturbed by fast switching transients.