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US 11,962,274 B2Granted
Amplifier device
AssigneeMurata Manufacturing Co., Ltd.
InventorsTsutomu Oonaro, Masamichi Tokuda, Makoto Tabei, Kazuaki Deguchi, Takayuki Kawano
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Abstract
An amplifier device includes an amplifier including cascade-connected power amplifiers in a plurality of stages and a bias circuit configured to supply bias currents to the amplifier. A bias current supplied to a power amplifier in the first stage of the power amplifiers in the plurality of stages exhibits a positive temperature characteristic. A bias current supplied to a power amplifier in the final stage exhibits a negative temperature characteristic.
Claims20
An amplifier device comprising:
- an amplifier including cascade-connected power amplifiers in a plurality of stages;
- and
- a bias circuit configured to supply bias currents to the power amplifiers in the plurality of stages, wherein:
- a first bias current supplied to a power amplifier in a first stage of the power amplifiers in the plurality of stages exhibits a positive temperature characteristic, and
- a second bias current supplied to a power amplifier in a final stage of the power amplifiers in the plurality of stages exhibits a negative temperature characteristic.
2 more elements
Dependencies are inferred from the claim text.