Title:
利得可変増幅回路及びそれを用いた無線通信機器用の集積回路
Document Type and Number:
Japanese Patent JP4903834
Kind Code:
B2
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.
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Inventors:
Toru Masuda
Nobuhiro Shiramizu
Takahiro Nakamura
Katsuyoshi Washio
Nobuhiro Shiramizu
Takahiro Nakamura
Katsuyoshi Washio
Application Number:
JP2009107673A
Publication Date:
March 28, 2012
Filing Date:
April 27, 2009
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H03G3/10; H03F3/191; H03F3/195; H03G3/14; H04B1/04; H04B1/16; H04B1/40
Domestic Patent References:
| JP57173210A | ||||
| JP2004522350A | ||||
| JP2009505517A | ||||
| JP2002009505A | ||||
| JP2008211535A |
Attorney, Agent or Firm:
Polaire Patent Business Corporation