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:
Oct. 23, 2007
Filed:
Dec. 20, 2002
Michael X. Maida, San Jose, CA (US);
Michael X. Maida, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An amplifier system includes a follower-type output stage that is driven by a pre-driver circuit. The follower-type output stage that is operated from VCC and GND (or VEE) power supplies. The pre-driver circuit for the follower output stage is operated from local power supplies corresponding to VHI and VLO. A charge-pump circuit generates the VHI power-supply such that VHI is above VCC. Another charge-pump circuit generates the VLO power-supply such that VLO is below GND (or VEE). The output stage delivers current to a load from the VCC and GND (or VEE) power supplies such that the output stage has increased power efficiency.