US Patent 7323937 Variable-gain amplifier

Patent 7323937 was granted and assigned to Sony on January, 2008 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Sony

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

73239370

Patent Inventor Names

Koichi Ooya0

Tsuyoshi Sakuma0

Date of Patent

January 29, 2008

Patent Application Number

105267580

Date Filed

September 10, 2003

Patent Primary Examiner

Robert Pascal

Patent abstract

A variable-gain amplifier has distortion characteristics (IIP3) improved when the gain is attenuated without impairing characteristics with respect to a gain PG and a noise figure NF when the gain is maximum. The variable-gain amplifier has a plurality of parallel-connected dual-gate FETs having first FETs (6), (8) having gates for being supplied with an input signal and second FETs (7), (9) connected in cascade to the first FETs (6), (8), respectively. Gate control voltages (Vcon1, Vcon2) can separately be applied to the second FETs (7), (9), respectively, from voltage control means.

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