Patent ID: 7916056

Claim:
A sigma-delta modulator comprising: a differential amplifier which outputs a difference signal indicating a difference between an input analog signal and a feedback input analog signal; an integrator which integrates the difference signal; a band pass filter unit connected to the integrator in parallel which performs band pass filtering with respect to the difference signal; an adder which adds the band-pass filtered signal to the integrated signal; a comparator which compares a signal output from the adder with a predetermined reference value, converts the comparison result into a digital signal, and outputs the digital signal; a digital-to-analog (D/A) converter which converts the digital signal output from the comparator into an analog signal and feeds the analog signal back to the differential amplifier; a data weighted array (DWA) unit which corrects the digital signal output from the comparator to prevent an error from occurring in the D/A converter; and a delay compensator connected to the DWA unit, which receives the signal output from the DWA unit to compensate for a delay between the input signal and the feedback input signal and provides the compensated signals to the D/A converter and the adder.