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:
Jul. 03, 2012
Filed:
Apr. 22, 2010
Toru Masuda, Kokubunji, JP;
Nobuhiro Shiramizu, Musashino, JP;
Takahiro Nakamura, Kodaira, JP;
Katsuyoshi Washio, Tokorozawa, JP;
Toru Masuda, Kokubunji, JP;
Nobuhiro Shiramizu, Musashino, JP;
Takahiro Nakamura, Kodaira, JP;
Katsuyoshi Washio, Tokorozawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is disclosed a variable-gain amplifier circuit that operates on a low voltage, exhibits low distortion, provides a wide range of variation, and is suitable for use in a low-power-consumption wireless communication system. The variable-gain amplifier circuit is configured so that a variable-load circuit, which includes three reactance function elements and provides a wide range of impedance variation, is connected to a conductor circuit whose output terminal generates a positive-phase output current proportional to conductance with respect to an input voltage.