SUCCESSIVE APPROXIMATION AD CONVERTER AND MOBILE WIRELESS DEVICE

摘要

A controller controls first and second supply switches so that, during a sampling period, a ground voltage is supplied to n first up-capacitors and n second up-capacitors while a power supply voltage is supplied to n first down-capacitors and n second down-capacitors. The controller also controls the first and second supply switches based on the result of comparison by a comparator during each of n bit determination periods so that a first analog voltage at a first sampling node and a second analog voltage at a second sampling node gradually approach each other.