| 摘要 |
A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be correctly expressed, or low-distortion characteristics of a power amplifier can be realized. Based on a steady characteristic compensating circuit 11 which stores an output signal amplitude and output phase characteristics with respect to a control voltage in a steady state, amplitude adjustment is executed on amplitude information r 11 (t) on which amplitude correction is performed, by a first amplitude information adjusting portion 13 , whereby the output-response characteristics of an output signal amplitude of an amplifier with respect to a change of the control voltage can be improved.
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