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:
Aug. 28, 2018
Filed:
Jun. 22, 2017
Applicant:
Mediatek Inc., Hsin-Chu, TW;
Inventors:
Chuan-Hung Hsiao, New Taipei, TW;
Kuan-Ta Chen, Hsinchu, TW;
Assignee:
MEDIATEK INC., Hsin-Chu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/00 (2006.01); H03M 1/74 (2006.01); H03F 3/217 (2006.01); H03F 3/30 (2006.01);
U.S. Cl.
CPC ...
H03M 1/742 (2013.01); H03F 3/2171 (2013.01); H03F 3/2173 (2013.01); H03F 3/304 (2013.01); H03F 3/3035 (2013.01); H03M 1/001 (2013.01); H03F 2203/45238 (2013.01);
Abstract
A circuit applied to speaker includes a tri-level current DAC and a class D amplifier. The current DAC is arranged to receive a digital signal to generate a current signal, and the class D amplifier is arranged to directly receive the current from the current DAC and to amplify the current signal to generate an output signal. SNR performance is well improved class D amplifier due to small signal noise reduced by preceding tri-level DAC. In addition, the circuit further includes a driving stage, and a gate-drain voltage of a power transistor within the driving stage can be controlled to set the appropriate slew rate.