1. An analog-to-digital (A/D) converter, comprising: a plurality of signal paths that are responsive to an analog input signal, to generate a multi-bit digital output signal therefrom; and a circuit that is configured to generate delayed clock signals, which have delay times different from each other according to phase differences, by feeding-back and detecting a phase of signals in the signal paths, and configured to correct the signals in the signal paths by using the delayed clock signals.