一、概述数字控制、计算机控制和数字仪器仪表在工业、商业、通信和军事系统中得到越来越广泛的应用.过去属于模拟领域的自动控制系统,现在受到了更经济的数字处理技术,尤其是微处理机的冲击.这类系统的输入和输出一般多为模拟量,因此对模数(A/D)转换和数模(D/A)转换电路的需求量迅速增长. I. INTRODUCTION Digital control, computer control and digital instrumentation are gaining more and more widespread use in industrial, commercial, communications and military systems.Automatic control systems that used to be in the field of analogue are now subject to more economical digital processing techniques, in particular Is the impact of microprocessors.As the input and output of such systems are mostly analog, the demand for analog-to-digital (A / D) conversion and digital-to-analog (D / A) conversion circuits is rapidly increasing.