Patent ID: 8462029
Filing Date: 2013-06-11
Classification: H03M

Abstract:
1. An analog-to-digital conversion apparatus comprising: 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 input analog signal into a digital signal; a difference imparting part configured to provide a difference of at least a fixed signal α between an input analog signal to the first analog-to-digital converter and an input analog signal to the second analog-to-digital converter, to input the input analog signal to the first analog-to-digital converter and the input analog signal to the second analog-to-digital converter, respectively; 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 difference between the first signal and the second signal with the non-linear distortion as the curvature and generate the control variable signal to negate a portion corresponding to the curvature to thereby output the control variable signal to the first non-linear compensation part and the second non-linear compensation part.