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:
Apr. 14, 2009
Filed:
Feb. 07, 2007
Jack B. Andersen, Cedar Park, TX (US);
Peter G. Craven, Thakeham, GB;
Daniel L. W. Chieng, Austin, TX (US);
Michael A. Kost, Cedar Park, TX (US);
Jack B. Andersen, Cedar Park, TX (US);
Peter G. Craven, Thakeham, GB;
Daniel L. W. Chieng, Austin, TX (US);
Michael A. Kost, Cedar Park, TX (US);
D2Audio Corporation, Milpitas, CA (US);
Abstract
Systems and methods for improving the stability of feedback and/or feed-forward subsystems in digital amplifiers. One embodiment comprises a digital pulse width modulation (PWM) controller. The controller includes an input for receiving a digital audio input signal and is configured to generate a PWM output signal based on the input signal at an output. The controller also has control inputs for receiving external audio correction signals such as feedback and power supply feed-forward signals. The controller has correction circuitry for processing the received external control signals and modifying the input signal based on these signals. Fault detectors monitor fault conditions at various locations within the correction circuitry, and a protection control unit receives fault signals from the fault detectors and modifies operation of the controller in response to the fault signals.