Analog-to-digital conversion apparatus and signal processing system

A signal processing system, comprising

• an analog-to-digital conversion apparatus configured to convert an analog signal from an analog signal processing system into a digital signal, the analog-to-digital conversion apparatus including
• a first analog-to-digital converter configured to convert an input analog signal into a digital signal,
• a second analog-to-digital converter configured to convert an analog signal generated by multiplying the input analog signal by α times with a coefficient α into a digital signal,
• a first non-linear compensation part configured to compensate a non-linear distortion of a first output signal of the first analog-to-digital converter depending on a control variable signal to be supplied,
• a second non-linear compensation part configured to compensate a non-linear distortion of a second output signal of the second analog-to-digital converter depending on the control variable signal to be supplied, and
• a non-linear detection part configured to estimate how much the non-linear distortion of the first analog-to-digital converter and that of the second analog-to-digital converter are compensated by the first non-linear compensation part and the second non-linear compensation part depending on a first signal by the first non-linear compensation part and a second signal by the second non-linear compensation part, the non-linear detection part being configured to estimate a curvature that depends on a signal intensity of the input analog signal on the basis of a ratio of a change generated by the first signal and the second signal with a non-linear distortion as the curvature and generate the control variable signal to negate the curvature portion to thereby output the control variable signal to the first non-linear compensation part and the second non-linear compensation part.