摘要随着集成电路工艺的进展，CMOS电路由于其低成本、低功耗以与速度的不断提高，在集成电路中获得越来越广泛的应用。CMOS运算放大器也因其独特的性能优势常被用于模拟集成系统或子系统中，它的性能的好坏直接决定了整个模拟集成系统性能的好坏。因此，有必要对用CMOS运算放大器进行深化的学习和讨论。CMOS运算放大器作为模拟集成电路最重要的功能模块，其设计一般包括以下几个步骤：确定设计要求；设计或综合；仿真；几何版图设计；版图后仿真；流片；测试。本论文主要对两级CMOS运算放大器进行了前端设计与仿真。论文在确定了两级CMOS运放设计规要求的基础上，设计了两级CMOS运算放大器的基本电路结构，分析了各组成模块的电路功能，，通过分析性能参数与MOS管几何参数的关系，得到了电路中各MOS管的宽长比。论文在介绍仿真环境OrCAD的结构特点与其工作性能的基础上，对所设计的电路进行了PSpice软件仿真，得到了设计电路的直流工作点、瞬态以与频率特性的仿真结果。仿真结果分析表明所设计的电路符合预期的设计要求和设计指标，也验证了设计的两级CMOS运算放大器的可靠性和可行性。关键词：CMOS；运算放大器；PSpice仿真；小信号放大；频率响应AbstractWith the development of CMOS technique, CMOS integrated circuits have become the mainstream of integrated circuits techniques, due to its low cost, low power consumption and continuously improved speed. As the CMOS process has good performance merits, therefore the operational amplifier combined with CMOS technique has been widely used because of its unique performance.As the most important functional module in analog integrated circuits, the design of CMOS operational amplifier includes several steps as follows: determination design requirements, design or synthesis, simulation, design geometric layout, post-layout simulation, tape-out and test. The formal steps of the design of the two-stage CMOS operational amplifiers was provided in this paper, and the basic circuit structures of the two-stage CMOS operational amplifier was introduced. Based on determining the op-amp design ...
