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:
Sep. 15, 2015
Filed:
May. 13, 2011
Seigo Ozaki, Kanagawa, JP;
Hirotsugu Kawata, Kanagawa, JP;
Seigo Ozaki, Kanagawa, JP;
Hirotsugu Kawata, Kanagawa, JP;
Abstract
An amplifier is capable of reducing the quantization error caused by conversion accuracy in an A/D converter circuit and, particularly, capable of improving the S/N ratio and distortion rate when an input audio signal is small. In an amplifier () using a voltage variable power supply () as a power supply to follow an input audio signal level (S) to the amplifier () in order to increase or decrease the level of supply voltage supplied to a power amplifier stage (), when the level of source power of the power amplifier stage () is changed, the voltage level of a reference voltage supplied to an A/D converter () of a negative feedback circuit is controlled.