LOW POWER CYCLIC A/D CONVERTER

摘要

A low power cyclic RSD ADC (20) has a single RSD stage (22) that receives one of an analog input signal and a residual voltage feedback signal and converts the one selected signal to a digital output signal. The RSD stage (22) generates the residue voltage feedback signal. A first switch (32) connects between a converter input terminal (30) and an input of the RSD stage (22) for applying the analog input to the RSD stage. A second switch (52) is connected between an output of the RSD stage (22) and the input of the RSD stage. The RSD stage (22) includes a pair of comparators (34, 36) that predetermins high and low voltages, respectively. A logic circuit (38) generates the digital output signal based on these outputs.