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:
Nov. 13, 2012
Filed:
Dec. 13, 2006
John Christopher Tucker, Austin, TX (US);
Daniel John Allen, Austin, TX (US);
John L. Melanson, Austin, TX (US);
Ammisetti Prasad, Austin, TX (US);
John Christopher Tucker, Austin, TX (US);
Daniel John Allen, Austin, TX (US);
John L. Melanson, Austin, TX (US);
Ammisetti Prasad, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
An energy-efficient consumer device audio power output stage provides improved battery life and reduced power dissipation. A power supply having a selectable operating mode supplies the power supply rails to the power amplified output stage. The operating mode is controlled in conformity with the audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The power supply may be a charge pump in which the operating mode uses a capacitive divider to provide for selection of a power supply output voltage that is a rational fraction of the power supply output voltage in a full-voltage operating mode.