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. 14, 2008
Filed:
Feb. 07, 2007
Michael A. Kost, Cedar Park, TX (US);
Jack B. Andersen, Cedar Park, TX (US);
Daniel L. W. Chieng, Austin, TX (US);
Michael A. Kost, Cedar Park, TX (US);
Jack B. Andersen, Cedar Park, TX (US);
Daniel L. W. Chieng, Austin, TX (US);
D2Audio Corporation, Austin, TX (US);
Abstract
Systems and methods for minimizing errors due to component variation in switching amplifiers utilizing power supply feed forward techniques. One embodiment comprises a digital PWM amplifier having an amplification subsystem for receiving a digital audio signal and producing an analog output signal. The amplifier includes a power supply feed-forward path configured to modify the digital audio signal based on a power supply measurement. The feed-forward path includes an analog filter configured to filter the power supply measurement, as well as correction circuitry configured to correct component mismatch errors introduced by the filter. The power supply measurement may be a power supply difference, a power supply common mode, or both. In either case, the power supply measurement is corrected by multiplying the measurement by an appropriately scaled power supply difference.