Invention Grant
- Patent Title: Variable-gain amplifier circuit and wireless communication device integrated circuit equipped therewith
- Patent Title (中): 可变增益放大器电路和配备其的无线通信设备集成电路
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Application No.: US12765010Application Date: 2010-04-22
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Publication No.: US08212615B2Publication Date: 2012-07-03
- Inventor: Toru Masuda , Nobuhiro Shiramizu , Takahiro Nakamura , Katsuyoshi Washio
- Applicant: Toru Masuda , Nobuhiro Shiramizu , Takahiro Nakamura , Katsuyoshi Washio
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Miles & Stockbridge P.C.
- Priority: JP2009-107673 20090427
- Main IPC: H03F3/45
- IPC: H03F3/45 ; H03F3/191

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.
Public/Granted literature
- US20100271122A1 VARIABLE-GAIN AMPLIFIER CIRCUIT AND WIRELESS COMMUNICATION DEVICE INTEGRATED CIRCUIT EQUIPPED THEREWITH Public/Granted day:2010-10-28
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