一、前言随着电子数字计算机及电子数字技术的迅速发展,把各种模拟量转化为数字量的A/D 转换技术日趋重要,相应的各种 A/D 转换器更是得到了日益广泛的发展及应用。A/D 转换器已广泛用于数字电视,数字雷达系统,统计测量,各种物理量(温度、压力、流量、速度、电流、电压……等)的测量,以及过程控制,环境控制、自动化工程控制……等各个领域。特别是微处理机出现后,微处理机有很大部分用于实时控制系统, I. INTRODUCTION With the rapid development of electronic digital computer and electronic digital technology, the A / D conversion technology that converts various analogs to digital is becoming more and more important. Correspondingly, various A / D converters are getting more and more extensive Development and application. A / D converters have been widely used in digital television, digital radar systems, statistical measurements, measurement of various physical quantities (temperature, pressure, flow, speed, current, voltage ...) as well as process control, environmental control, Control ...... and other fields. Especially after the emergence of microprocessors, microprocessors have a large part for real-time control system,