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. 06, 2013
Filed:
Dec. 19, 2011
Katsuya Hirano, Hamamatsu, JP;
Hirotoshi Tsuchiya, Iwata, JP;
Katsuya Hirano, Hamamatsu, JP;
Hirotoshi Tsuchiya, Iwata, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
Abstract
A class-D amplifier circuit includes an amplifier that generates pulse-width modulated output signals according to input signals which have phases reverse to each other and are supplied to a first input end and a second input end, a first transistor interposed between a first input path extending from the first input end to the amplifier and a second input path extending from the second input end to the amplifier, and a voltage applying circuit that applies a control voltage corresponding to a predetermined value to a control terminal of the first transistor so that a current flowing between both ends of the first transistor increases in accordance with increase of levels of the input signals within a range in which the levels of the input signals are higher than the predetermined value.