Method and apparatus for generating the feedback signal in analog-to-digital sigma-delta.

A digital to analog converter (DAC) (50) for generating a feedback signal conversion (IFB (t)) in a sigma-delta (40), the DAC analog to digital converter (ADC) type which functions as a current pulse generator and comprising: a capacitor circuit (52) configured to be preloaded with a reference voltage for each feedback cycle of the ADC; and it characterized by further comprising: a resistive circuit (58) for transferring charge between the capacitor circuit and a loop filter of the ADC in each feedback cycle; said resistive circuit (58) configured to vary its resistance during each feedback cycle according to a desired current pulse for the conversion feedback signal.