| 摘要 |
PURPOSE: A distortion compensator and a method for compensating method are provided to be capable of compensating distortion component in such a device as a power amplifier without requiring a demodulator, thereby enabling to configure with a simple structure. CONSTITUTION: This adaptive distortion compensation apparatus comprises a first envelope detection section(DET 1)1, a second envelope detection section(DET 2)(15), a voltage comparator(CMP)(17), a logic(ADP_Logic) section(18), an amplitude control signal generation means, and a gain control section(13). The first envelope detection section(DET 1) detects an envelope voltage in_DET of a high-frequency signal PA_in having an envelope change, which is supplied to the power amplifier(14). The second envelope detection section(DET 2)(15) detects an envelope voltage out_DET of an output signal PA_out of the power amplifier(14). The voltage comparator(CMP)(17) compares the envelope voltage detected by the first envelope detection section 1 with the envelope voltage detected by the second envelope detection section(15). The logic section(ADP_Logic)(18) corrects the relationship in magnitude, which is detected by the voltage comparator(17). The amplitude control signal generation means generates an amplitude control signal AM_ctl for controlling the amplitude of the input signal PA_in, based on the corrected output of the logic section(18). The gain control section(13) controls the gain of the amplitude of the input signal PA_in, based on the amplitude control signal generated by the amplitude control signal generation means.
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