| 摘要 |
To provide a semiconductor instrument for improving power added efficiency when a low power is outputted. In the semiconductor instrument in which a radio-frequency input signal (SRF) is supplied to input circuits of a plurality of transistors (1, 2), output circuits of the plurality of transistors (1, 2) are connected in parallel, and a radio-frequency output signal amplified with power is retrieved an amplifying operation of one part transistor (2) of the plurality of the transistors (1, 2) is turned off during a low-output operation.
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