Voltage-to-digital converter with event-driven charge redistribution

The paper addresses a design of an analog-to-digital converter based on event-driven successive charge redistribution intended to convert signals originated in voltage domain. Since the conversion is realized in charge domain, the sampling is substituted by a linear translation of the continuous-time input voltage to proportional input charge. Two methods of voltage-to-charge translation called respectively voltage-mode and current-mode are discussed in the paper. Furthermore, it is explicitly shown that the conversion adopts binary search algorithm with reducing quantization error by concurrent charge comparison and subtraction.