SELF-CALIBRATED DELTA-SIGMA MODULATOR AND METHOD THEREOF

摘要

A delta-sigma modulator and corresponding method are disclosed. In one implementation, the delta-sigma modulator includes a multiplexer for receiving an analog input signal and a common mode signal and outputting a multiplexed signal in accordance with a selection signal; a summing circuit for receiving the multiplexed signal and an analog feedback signal and outputting an error signal; a loop filter for receiving the error signal and outputting a filtered signal; a quantizer for receiving the filtered signal and outputting a raw digital output signal; a digital-to-analog converter for receiving the raw digital output signal and outputting the analog feedback signal along with a rotated digital output signal in accordance with a phase indicator and a rotation number; and a calibration logic for receiving the rotated digital output signal and a mode indicator and outputting the selection signal, the phase indicator, the rotation number, and a calibrated digital output signal.

主权项

1. A delta-sigma modulator comprising:
a multiplexer for receiving an analog input signal and a common mode signal and outputting a multiplexed signal in accordance with a selection signal; a summing circuit for receiving the multiplexed signal and an analog feedback signal and outputting an error signal; a loop filter for receiving the error signal and outputting a filtered signal; a quantizer for receiving the filtered signal and outputting a raw digital output signal; a digital-to-analog converter for receiving the raw digital output signal and outputting the analog feedback signal along with a rotated digital output signal in accordance with a phase indicator and a rotation number; and calibration logic for receiving the rotated digital output signal and a mode indicator and outputting the selection signal, the phase indicator, the rotation number, and a calibrated digital output signal.