| 摘要 |
According to this invention, a power controller includes a power amplifier, a detector, a digital/analog converter, and a power control unit. The amplifier amplifies RF signal input on the basis of an applied control voltage to output a RF power. The detector detects the RF power from the power amplifier to output a detection voltage. The digital/analog converter converts externally input digital data into a reference voltage to output the reference voltage. The power control unit compares the reference voltage from the digital/analog converter means with the detection voltage from the detector to output the control voltage. The digital/analog converter has conversion characteristics in which a rate of change in reference voltage corresponding to a change in digital data is set to be low in a high sensitive output region of a feedback system constituted by the power amplifier, the detector, and the power control circuit and is set to be high in a low sensitive output region.
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