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. 24, 2005
Filed:
Dec. 09, 2002
Jun Chen, Allen, TX (US);
Siew K. Hoon, Dallas, TX (US);
Jun Chen, Allen, TX (US);
Siew K. Hoon, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A low drop-out voltage regulator uses a voltage subtractor circuitto form a power supply rejection boost circuit. The voltage subtractoris inserted between the pass elementand the amplifierof the low drop-out regulator. The voltage regulator circuit includes a pass elementcoupled between an input node and an output node; a voltage feedback circuitandcoupled to the output node Vo; an amplifierhaving an input coupled to the voltage feedback circuit; and a voltage subtractorhaving a control node coupled to an output of the amplifier, an output coupled to a control node of the pass element, and an input coupled to the input node. The boost circuit improves supply noise rejection performance significantly without adding much complexity to the regulator system. The boost circuit is simple and consumes negligible silicon area and power.