| 摘要 |
A power supply voltage required on the basis of information of setting transmission power to be output is supplied, thereby minimizing power consumption. A transmission circuit comprises a driver amplifier 3 whose gain is controlled by a first control voltage Vc 1 for setting transmission power and a power amplifier 4 connected to the post-stage of the power amplifier 3 . A power supply circuit 5 to which the first control voltage Vc 1 is input and whose output voltage is controlled by the first control voltage Vc 1 is provided. A voltage required for the power amplifier 4 when outputting the transmission power set by the first control voltage Vc 1 is supplied from the power supply circuit 5.
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