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. 25, 2009
Filed:
Aug. 24, 2006
Akira Fujishima, Aichi, JP;
Yasuhiro Hibino, Gifu, JP;
Toshihiro Furusawa, Gifu, JP;
Hirokazu Kitamura, Gifu, JP;
Takashi Umeda, Shiga, JP;
Takahiro Koyama, Aichi, JP;
Akira Fujishima, Aichi, JP;
Yasuhiro Hibino, Gifu, JP;
Toshihiro Furusawa, Gifu, JP;
Hirokazu Kitamura, Gifu, JP;
Takashi Umeda, Shiga, JP;
Takahiro Koyama, Aichi, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A high-frequency receiver capable of improving both an interference-resistant characteristic and reception sensitivity is provided. A gain switch control unit includes: a signal level determination unit comparing a gain control voltage of an amplifying circuit with a reference voltage; and a gain switch controller provided between an output terminal of the signal level determination unit and a gain control input terminal provided to an amplifying circuit for gain control. When receiving a signal in a strong electric field area having a high possibility that a strong interference signal exists, a gain of the amplifying circuit is set to be smaller than that in a case of receiving a signal in a weak electric field area by a gain switch signal output from the gain switch controller.