Power amplification circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsSatoshi TANAKA, Tetsuaki ADACHI, Kazuo WATANABE, Masahito NUMANAMI, Yasuhisa YAMAMOTO
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Abstract
Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.
Claims8
A power amplification circuit comprising:
- an amplifier that amplifies an input signal and outputs an amplified signal;
- a first bias circuit that supplies a first bias current or voltage to the amplifier;
- a second bias circuit that supplies a second bias current or voltage to the amplifier;
- a first control circuit that controls a level of the first bias current or voltage;
- and
- a second control circuit that controls a level of the second bias current or voltage;
- wherein a current supplying capacity of the first bias circuit is different from a current supplying capacity of the second bias circuit, and
- wherein the first control circuit outputs a first current that controls the first bias current or voltage,
- wherein the second control circuit outputs a second current that controls the second bias current or voltage,
- wherein the first bias circuit comprises a first bipolar transistor that outputs the first bias current or voltage in accordance with the first current,
- wherein the second bias circuit comprises a second bipolar transistor that outputs the second bias current or voltage in accordance with the second current, and
- wherein a size of the first bipolar transistor is different from a size of the second transistor.
Dependencies are inferred from the claim text.