Digital correction and calibration circuits for a high-resolution CMOS pipelined A/D converter

파이프라인 구조를 가진 고해상도 CMOS A/D 변환기를 위한 디지탈 교정 및 보정 회로

In this paper, digital corrction and calibration circuit for a high-resolution CMOS pipelined A/D converter are proposed. The circuits were actually applied to a 12 -bit 4-stage pipelined A/D converter which was implemented in a 0.8${\mu}$m p-well CMOS process. The proposed digital correction logic is based on optimum multiplexer and two nonoverlapping clock phases resulting in a small die area snd a modular pipelined architecture. The propsoed digital calibration logic which consists of calibration control logic, error averaging logic, and memory can effectively perform self-calibration with little modifying analog functional bolcks of a conventional pipelined A/D conveter.