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. 07, 2001
Filed:
Sep. 29, 2000
Amit Burstein, Tewksbury, MA (US);
Daniel Shkap, Cambridge, MA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The invention relates to a voltage regulator providing high immunity to DC variations of a power supply. The voltage regulator comprises a voltage regulator circuit, a gain stage that is connected to the output of the voltage regulator circuit, and a voltage modulation device forming a signal feedback loop between an output and an input of the gain stage. An initial reference voltage is generated by the voltage regulator circuit and provided to an input of the gain stage. The difference between this initial reference voltage and a fractional portion of the feedback signal, from the voltage modulation device, is amplified by the gain stage. The amplified signal of the gain stage is used to modulate the reference voltage provided to an external load. Better DC accuracy and stability is obtained by using a two stage amplifier to increase the loop gain of the voltage regulator.