Kaskadierter Analog-Digital-Wandler

The objective of the present invention is to realize a cascade A/D converter that can prevent error generation due to noise. The present invention relates to improvement of a cascade A/D converter configured by connecting in cascade two or more stages of electronic circuits, each stage comprising a comparator to convert an analog input signal to a digital signal, a latch circuit to hold the output of this comparator, a D/A converter to convert the output of the comparator again to an analog signal, and a subtracter to subtract the output of the D/A converter from the analog input signal. The cascade A/D converter of the present invention is characterized by inclusion of a waveform composition circuit to compose code changing waveforms in the comparators, a plurality of means for detecting each vicinity of code changing points for detecting the code changes in comparators by receiving the changing waveforms in the waveform composition circuit as inputs, and an error correction circuit that rejects noise generated at the code changing points based on the outputs of the above means for detecting each vicinity of code changing points.