Patent ID: 8836551

Claim:
An analog digital converter (hereinafter ADC) that samples an analog input signal at a sampling frequency and converts the analog input signal into a digital output signal, the ADC comprising: a plurality of ADC channels configured to convert the analog input signal into the digital output signal in a time interleave manner; a channel combiner configured to combine channel digital signals respectively output by the plurality of ADC channels and generate the digital output signal; an adaptive filter provided between an output of at least one of the plurality of ADC channels and the channel combiner; and a correction circuit configured to detect a skew error included in the digital output signal, generate a coefficient of the adaptive filter according to the skew error, and set the coefficient in the adaptive filter, wherein in a first setting, the correction circuit sets, according to the skew error, the coefficient such that the adaptive filter phase-shifts to one direction for advancing or delaying a phase of the channel digital signal and, in a second setting, the correction circuit sets, according to the skew error, the coefficient such that the adaptive filter phase-shifts to an opposite direction to the one direction and sets, in the adaptive filter, a coefficient with which the skew error is suppressed to a desired level.