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计算线性电路问题(例如放大倍数、输入阻抗、输出阻抗等),一般都是先列出这个电路的一组线性方程,然后利用代数方法求得这组方程的解。但当电路比较复杂时,特别是存在反馈的情况下,直接求解方程就难免繁复的代数运算,既浪费时间又易使结果出差错。下面介绍信号流图及流图两种新方法,它们都是用来表示一组线性方程的图形,根据图形就能进行直观的计算,避免了解方程过程中繁复的代数运算。我们在这里对信号流图的概貌作一简单通俗的介绍,麦孙公式的证明从略。
Calculating linear circuit problems (such as magnification, input impedance, output impedance, etc.) is usually preceded by a list of linear equations for the circuit, which are then solved algebraically. However, when the circuit is more complex, especially in the presence of feedback, directly solving the equation will inevitably complicated algebraic operation, which is a waste of time and easy to make the results of the error. Here are two new methods of signal flow graph and flow graph, they are used to represent a set of linear equations of the graph, according to the graph can be intuitive calculation, to avoid complicated equation algebra operations. Here we make a brief introduction of the signal flow diagram, and the proof of the Mesun formula is omitted.