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:
Sep. 02, 2014
Filed:
May. 07, 2009
John Paul Lesso, Edinburgh, GB;
John Paul Lesso, Edinburgh, GB;
Wolfson Microelectronics plc, Edinburgh, GB;
Abstract
There is provided an audio amplifier circuit (), comprising: an input, for receiving an input signal; an amplifier () for receiving a modified input signal and outputting an amplified signal; and a feedback loop () comprising digital circuitry for feeding back the amplified signal and combining a feedback signal with the input signal to generate the modified input signal. The feedback loop () comprises: a low-pass filter () for filtering the amplified signal; a comparator () for comparing the filtered signal with a threshold value and outputting a comparison signal; and an integrator () for integrating the comparison signal and outputting the feedback signal. According to another embodiment, the feedback loop comprises an integrator and a sigma-delta modulator.