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:
Dec. 01, 2015
Filed:
Mar. 23, 2012
Applicants:
Tsuyoshi Haga, Kanagawa, JP;
Seigo Ozaki, Kanagawa, JP;
Inventors:
Tsuyoshi Haga, Kanagawa, JP;
Seigo Ozaki, Kanagawa, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/38 (2006.01); H03F 3/185 (2006.01); H03F 3/187 (2006.01); H03F 3/217 (2006.01);
U.S. Cl.
CPC ...
H03F 3/185 (2013.01); H03F 3/187 (2013.01); H03F 3/2171 (2013.01); H03F 3/2173 (2013.01); H03F 3/217 (2013.01);
Abstract
Because of input of a digital signal, PWM-input, separately excited, class-D amplifier systems are less prone to be affected by noise than in the conventional case that an analog signal is input. Since a ramp wave that is synchronized with a PWM signal is used as a comparison clock, no beats occur between a PWM clock and a reference clock, making is possible to provide a class-D amplifier system which exhibits a large S/N ratio. Furthermore, the fact that an external clock can be varied provides another advantage that no beat noise occurs even in a set that is disposed close to a radio receiver.