一种含理想运算放大器电路的讨论  

Discussion on a Circuit Including Ideal Operational Amplifier

作　　者：岳彩青[1] 常青美[1] 王建民[1] 

机构地区：[1]信息工程大学理学院电子信息工程系,河南郑州450001

出　　处：《电气电子教学学报》2007年第3期54-57,共4页Journal of Electrical and Electronic Education

摘　　要：为进一步明确含理想运算放大电路的有关概念和运算放大器的特性,本文从计算机仿真和理论分析两个方面,对一个含理想运算放大器电路的输入输出特性进行了模拟和推导。结果表明该电路在线性输入范围内是一电压跟随器,若超出线性输入范围,则输出波形严重失真;带反馈电路与开环电路相比较表现为线性输入范围扩大、电压增益减小,而这正是电路负反馈的特性。因此,不能简单的把接在运算放大器同相输入端的反馈视为正反馈。I/O characteristic of circuit including ideal operational amplifier is simulated and deduced in this paper from computer simulating and theory analyzing in order to clear further the relevant concept and characteristic of ideal operational amplifier. The results indicate the circuit behaves like a voltage follower within linear input range. The output wave becomes distorted seriously as input signal beyond linear input range. Compared with open loop circuit, the closed loop circuit has larger linear input range and smaller voltage gain, which exactly the characteristic of circuit with negative feedback. So we can not consider simply that feedback between the output and the noninverting input is positive feedback.

关 键 词：理想运算放大器 电压跟随器 负反馈 

分 类 号：TN722[电子电信—电路与系统]