Power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorTakashi Soga
Life of this patent
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Abstract
A power amplifier circuit includes a first transistor that amplifies a first signal and outputs a second signal, a second transistor that amplifies a signal corresponding to the second signal and outputs a third signal, a third transistor that supplies a first bias current or voltage to a base of the first transistor, and a fourth transistor that supplies a second bias current or voltage to a base of the second transistor. A ratio of an emitter area of the third transistor to an emitter area of the first transistor is larger than a ratio of an emitter area of the fourth transistor to an emitter area of the second transistor.
Claims9
A power amplifier circuit comprising:
- a first transistor that amplifies a first signal and outputs a second signal;
- a second transistor that amplifies a signal corresponding to the second signal and outputs a third signal;
- a third transistor that supplies a first bias current or bias voltage to a base of the first transistor;
- and
- a fourth transistor that supplies a second bias current or bias voltage to a base of the second transistor,
- wherein a ratio of an emitter area of the third transistor to an emitter area of the first transistor is greater than a ratio of an emitter area of the fourth transistor to an emitter area of the second transistor.
Dependencies are inferred from the claim text.