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:
Jan. 15, 2019
Filed:
Mar. 21, 2018
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Tejasvi Das, Austin, TX (US);
Alan Mark Morton, Austin, TX (US);
Xin Zhao, Austin, TX (US);
Lei Zhu, Austin, TX (US);
Xiaofan Fei, Austin, TX (US);
Johann G. Gaboriau, Austin, TX (US);
John L. Melanson, Austin, TX (US);
Amar Vellanki, Cedar Park, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A system may include a digital pulse width modulator subsystem, a first path coupled to an output of the digital pulse width modulator subsystem and configured to drive an open-loop driver stage, a second path coupled to the output of the digital pulse width modulator subsystem and configured to drive a closed-loop analog pulse width modulator, a controller to select between the first path and the second path for processing a signal based on one or more characteristics of the signal, and a calibration subsystem configured to calibrate at least one of a first gain of the first path and a second gain of the second path in order that the first gain and the second gain are at least approximately equal at the time of switching selection between the first path and the second path or vice versa, in order to minimize artifacts due to the switching.