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US 2015/0084698 A1Published application
Power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsMasahiro Ito, Kiichiro Takenaka, Satoshi Tanaka, Hidetoshi Matsumoto
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Abstract
Linearity and power efficiency in a power amplifier circuit are enhanced. The power amplifier circuit includes a first transistor that amplifies a signal input to the base and that outputs the amplified signal from the collector and a first capacitor that is disposed between the base and the collector of the first transistor and that has voltage dependency of a capacitance value lower than that of a base-collector parasitic capacitance value of the first transistor.
Claims20
A power amplifier circuit comprising:
- a first transistor configured to amplify a signal input to a base of the first transistor and output an amplified signal from a collector of the first transistor;
- and
- a first capacitor disposed between the base and the collector of the first transistor and having voltage dependency of a capacitance value lower than that of a base-collector parasitic capacitance value of the first transistor.
Dependencies are inferred from the claim text.