| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplifying circuit for preventing a change in output power and current of a power amplifier at high speed with high accuracy in response to a changed antenna load. SOLUTION: A power amplifier 11 amplifies a high frequency signal to obtain an output signal. A regulator 12 amplifies an input voltage with a predetermined gain, and supplies an output voltage to the power amplifier 11. A current monitor 13 monitors an input current to the regulator 12, to obtain a monitor current. A first multiplier 14 multiplies information on the monitor current by information on the output voltage of the regulator 12, to obtain information on monitor power. A memory 16 stores in advance information on a predetermined reference current. A second multiplier 15 multiplies information on the input voltage by information on the reference current to obtain information on reference power. The regulator 12 comprises a gain control section 121 for controlling the predetermined gain on the basis of the information on the monitor power and the information on the reference power. COPYRIGHT: (C)2011,JPO&INPIT
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