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:
Mar. 29, 2022
Filed:
Aug. 25, 2020
Applicant:
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Inventors:
Assignee:
Cirrus Logic, Inc., Austin, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/21 (2006.01); H03F 3/217 (2006.01); H03F 3/45 (2006.01); H03F 3/187 (2006.01); H03F 1/02 (2006.01); H03F 1/32 (2006.01);
U.S. Cl.
CPC ...
H03F 3/2171 (2013.01); H03F 1/0205 (2013.01); H03F 1/0211 (2013.01); H03F 1/3205 (2013.01); H03F 1/3211 (2013.01); H03F 3/187 (2013.01); H03F 3/2173 (2013.01); H03F 3/45215 (2013.01); H03F 3/45475 (2013.01); H03F 3/45672 (2013.01); H03F 2200/03 (2013.01); H03F 2200/129 (2013.01); H03F 2200/135 (2013.01); H03F 2200/264 (2013.01); H03F 2200/267 (2013.01); H03F 2200/351 (2013.01); H03F 2200/462 (2013.01); H03F 2200/471 (2013.01); H03F 2203/45116 (2013.01); H03F 2203/45512 (2013.01); H03F 2203/45528 (2013.01);
Abstract
A Class-D amplifier that includes a driver stage operable in a plurality of modes having different respective output impedances, a loop filter having an output, and a circuit configured to sense a current at a load of the Class-D amplifier, determine, based on the sensed current, an IR drop for a respective output impedance of the driver stage, and add the IR drop to the loop filter output to compensate for the respective output impedance of the driver stage to reduce distortion.