Patent ID: 6222477
Filing Date: 2001-04-24
Classification: H03M

Abstract:
A cascade A/D converter comprising:first comparator means for converting an analog input signal into a first digital signallatch means for holding said first digital signal;D/A converter means for converting said first digital signal to a first analog signal;subtractor means for subtracting said first analog signal from said analog input signal and for outputting a subtract output signal;waveform composition means for composing code changing waveforms of said analog input signal utilizing said subtract output signal;window comparator means for detecting each vicinity of code changing points of said analog input signal for one stage and of said changing waveforms in other stages and for outputting an output signal; anderror correction means for rejecting noise generated at said code changing points based on first digital signal and on output signals from said waveform composition means and from said window comparing means.