Delta-sigma analog-to-digital conversion apparatus and method thereof

A delta-sigma analog-to-digital conversion (DSADC) method for receiving an analog input signal to generate a digital output signal, comprising:

• performing a signal subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal;
• performing a quantization function to generate a quantized signal according to the subtracted signal;
• and
• performing a conversion function according to the quantized signal to provide the feedback signal for the signal subtraction function;
• wherein the signal subtraction function is arranged to reduce swing of the subtracted signal.

A delta-sigma analog-to-digital conversion (DSADC) apparatus for receiving an analog input signal to generate a digital output signal, comprising:

• a subtracting unit, for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal;
• a quantizer, coupled to the subtracting unit, for performing quantization to generate a quantized signal according to the subtracted signal;
• a digital computation unit, coupled to the quantizer, for receiving the quantized signal and performing digital computation to generate a specific signal having a signal range smaller than that of the quantized signal;
• and
• a feedback unit, coupled to the digital computation unit and the subtracting unit, for providing the feedback signal to the subtracting unit according to the specific signal generated by the digital computation unit.

A delta-sigma analog-to-digital conversion (DSADC) method for receiving an analog input signal to generate a digital output signal, comprising:

• performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal;
• performing quantization to generate a quantized signal according to the subtracted signal;
• performing digital computation on the quantized signal to generate a specific signal having a signal range lower than that of the quantized signal;
• and
• providing the feedback signal for the subtracting function according to the specific signal generated by the digital computation.