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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.:

US 9955257 B1

PDFFull Text
Date of Patent:
Apr. 24, 2018

Filed:

Aug. 18, 2016

Class-d audio amplifier

Applicant:

Silergy Semiconductor Technology (Hangzhou) Ltd., Hangzhou, CN;

Inventors:

Huaping Zhu, Hangzhou, CN;

Hejinsheng Cao, Hangzhou, CN;

Qichang Wu, Hangzhou, CN;

Zhenguo Sun, Hangzhou, CN;

Assignee:

SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD., Hangzhou, CN;

Attorney:

Westman, Champlin & Koehler, P.A.

Primary Examiner:

Khanh V Nguyen

Int. Cl.
CPC ...
H03F 3/38 (2006.01); H04R 3/02 (2006.01); H03F 3/187 (2006.01); H03F 3/213 (2006.01); H03F 1/34 (2006.01); H03F 1/30 (2006.01); H03F 3/185 (2006.01); H03F 3/45 (2006.01); H03G 3/34 (2006.01); H03F 3/217 (2006.01);
U.S. Cl.
CPC ...
H04R 3/02 (2013.01); H03F 1/305 (2013.01); H03F 1/342 (2013.01); H03F 3/185 (2013.01); H03F 3/187 (2013.01); H03F 3/213 (2013.01); H03F 3/2173 (2013.01); H03F 3/45475 (2013.01); H03G 3/348 (2013.01); H03F 3/217 (2013.01); H03F 3/2171 (2013.01); H03F 3/38 (2013.01); H03F 2200/03 (2013.01); H03F 2200/351 (2013.01); H03F 2200/432 (2013.01); H03F 2203/45512 (2013.01); H03F 2203/45528 (2013.01); H03F 2203/45534 (2013.01); H03F 2203/45536 (2013.01); H03F 2203/45594 (2013.01); H03F 2203/45631 (2013.01); H03F 2203/45634 (2013.01); H03F 2203/45702 (2013.01); H04R 2430/01 (2013.01);
Abstract

The present disclosure relates to a class-D audio amplifier. When the class-D audio amplifier is powered on, an auxiliary power amplifier and an auxiliary feedback circuit constitute an auxiliary close loop so that a control loop is established in advance. The auxiliary close loop is disconnected after various circuit modules reach their steady operation points, and the class-D audio amplifier operates at a normal state. A soft start circuit is provided for suppressing noise which occurs when the class-D audio amplifier is powered on. Thus, the class-D audio amplifier suppresses POP noise at an output terminal when the class-D audio amplifier is powered on.

Find Patent Forward Citations

Zhu, Huaping. (2018). Class-d audio amplifier (U.S. Patent No. 9955257). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9955257

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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