| 摘要 |
PROBLEM TO BE SOLVED: To improve a capability to compensate for a nonlinear distortion.SOLUTION: A correction section 111 multiplies a digital signal by a correction value. A conversion section 112 converts the digital signal multiplied by the correction section 111 to an analog signal. A sample-and-hold section 113 holds an instantaneous value of the analog signal converted by the conversion section 112 and amplified by an amplifier 120 at a period 1/f corresponding to a frequency f lower than twice a maximum frequency of the analog signal. A digitizer 114 converts the instantaneous value held by the sample-and-hold section 113 to a digital value on an operating clock having the frequency f. An updating section 115 updates the correction value of the correction section 111 to such a correction value as compensates for a nonlinear distortion of the analog signal in the amplifier 120, on the basis of the digital value converted by the digitizer 114. |
