AMPLIFICATION CIRCUIT AND RADIO COMMUNICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To compensate for a quadrature modulation error without providing an additional feedback loop for detecting the quadrature modulation error.

SOLUTION: An amplification circuit includes: a quadrature modulator 33; an amplifier 2 for amplifying a quadrature-modulated signal; a distortion compensation section 4 for compensating a distortion of the amplifier with a first compensation coefficient; a quadrature modulation error compensation section 9 for compensating a quadrature modulation error; an updating section 10b for updating a second compensation coefficient for compensating the quadrature modulation error; an error estimation section 10a for estimating an error of the quadrature modulation error; and a prediction section for computing a prediction value of an output of the amplifier with the second compensation coefficient updated. The second compensation coefficient is updated on the basis of the estimated error. The prediction value is computed on the basis of the estimated error and an amplifier output. The distortion compensation section 4 computes the first compensation coefficient on the basis of the prediction value.

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