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:
Apr. 22, 2008
Filed:
Jan. 27, 2005
Takatoshi Tanaka, Hyogo, JP;
Takuo Hino, Osaka, JP;
Takatoshi Tanaka, Hyogo, JP;
Takuo Hino, Osaka, JP;
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Abstract
Low distortion is implemented even in a high input level, and a smooth change in gain is maintained. A first amplifier () with high gain and low noise that can be gain-controlled by a first gain control signal, and a second amplifier () with low gain and low distortion that can be gain-controlled by a second gain control signal are provided, and a third amplifier () is further coupled with an outputs of the first and the second amplifiers (). An input terminal of the first amplifier () and an input terminal of the second amplifier () are coupled with each other, and an output terminal of the first amplifier () and an output terminal of the second amplifier () are coupled with each other. The output of the first amplifier () is then turned on or off by a mode switching signal. A change in gain resulting from turning on and off the first amplifier () is corrected by the third amplifier ().