阻抗匹配电路在电子测量仪器前端模拟通道中的应用

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阻抗匹配电路是电子测量仪器前端模拟通道中的关键电路。在介绍电子测量仪器前端模拟通道组成、功能的基础上,阐述了阻抗匹配的作用,即实现信号最大功率传输和实现信号无反射传输。分析了选频匹配网络中常用的倒L型网络、T型网络和Π型网络的电路模型和电路参数设计计算方法,给出了实现阻抗变换的各种电压跟随器的电路结构形式,并对电子测量仪器前端T型阻抗匹配电路参数的计算进行了举例说明。

Impedance matching circuit is the key circuit in analog input channels of electronic measuring instruments. The paper firstly introduced the composition and functions of analog input channels in instruments, and expounded the roles of impedance matching, that is, it can transmit signal with maximum power or without reflecting. In the same time, it also analyzed the circuit models and the calculating methods of overturning L, T and П style network, and proposed the circuits of each voltage follower to realize impedance change. Finally, the paper illustrate the parameter calculation of T impedance matching circuit in analog input channels of electronic measuring instruments.