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. 18, 2003
Filed:
Nov. 08, 2001
James Charles Schmoock, Granite Bay, CA (US);
Jeffrey P. Kotowski, Nevada City, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A linear regulator includes an amplifier that provides a control signal in response to a comparison between a feedback signal and an output signal. A pass element in the regulator selectively couples power from an unregulated power signal to an output node in response to the control signal. A compensation circuit that includes negative gain is arranged to provide the feedback signal in response to an output signal at the output node. In one example, the compensation circuit includes an inverting amplifier that provides an intermediary signal in response to the output signal, and the intermediary signal is coupled to a feedback network that provides the feedback signal. In another example, the compensation circuit includes an inverting amplifier that cooperates with a feedback network to provide the feedback signal. The closed-loop transfer functions of the compensation circuits provide a feed-forward zero that enables stable operation of the LDO regulator.