Murata Manufacturing Co., Ltd.

Masato Sato

Yuri Honda

Shota Ishihara

Fuminori Morisawa

Yusuke Shimamune

Shizuki Nakajima

Seiko Ono

Kazuhiro Koshio

A power amplifier module includes a first current source that outputs a first current corresponding to a level control voltage for controlling a signal level of an amplified signal, a second current source that outputs a second current corresponding to the level control voltage, a first transistor in which an input signal and a first bias current are supplied to a base and an emitter is grounded, a second transistor in which an emitter is connected to a collector of the first transistor, the second current is supplied to a base, and a first amplified signal obtained by amplifying the input signal is output from a collector, and a third transistor in which the first current is supplied to a collector, a bias control current or voltage is supplied to a base, and the first bias current is supplied from an emitter to the base of the first transistor.

Power amplifier module

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Kyoto, Japan

Masato Sato