Renesas Technology Corp.

Kinya Hosoda

Hiroshi Komurasaki

Hisayasu Satoh

Keitaro Sekine

Akira Hyogo

A variable gain amplifier is configured of an amplification circuit and a control circuit controlling a gain of the amplification circuit. The amplification circuit has first and second MOS transistors identical in characteristics and having respective sources connected to a first fixed potential. The amplification circuit has a differential gain proportional to a square root of a ratio between a current flowing through the first MOS transistor and a current flowing through the second MOS transistor. The control circuit applies a potential corresponding to a constant voltage plus a control voltage to a gate of the first MOS transistor and a potential corresponding to the constant voltage minus the control voltage to a gate of the second MOS transistor.

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Saitama, Japan

Kinya Hosoda