Patent ID: 8199041
Filing Date: 2012-06-12
Classification: H03M

Abstract:
1. An analog-to-digital converter comprising: a higher-order analog-to-digital converter that outputs a higher-order digital value corresponding to a signal level of an analog input signal; a first lower-order converter that generates a first residual signal based on the higher-order digital value and the analog input signal, and converts the first residual signal into a first lower-order digital value; a second lower-order converter that generates a second residual signal based on the higher-order digital value and the analog input signal, and converts the second residual signal into a second lower-order digital value; and a calibrator that outputs a first offset adjustment signal and a second offset adjustment signal for respectively designating offset adjustment amounts in reversed polarity based on a difference between the first and second lower-order digital values, wherein the first lower-order converter and the second lower-order converter set a conversion calibration value based on the first and second offset adjustment signals, and calibrate the first and second lower-order digital values based on the conversion calibration value.