无源网络理论中的替代定理可推广到具有受控电源的电路.当它运用在分析反馈电路的时候,能将反馈电路化为无反馈电路,从而使计算大大简化.尤其当我们能够熟练地运用替代定理以后,对于反馈电路的分析和计算,有时就不需要画出等效电路和列出回路方程式,而可直接地写出结果来.下面将简单地 The substitution theorem in passive network theory can be generalized to a circuit with a controlled power supply. When it is used in the analysis of a feedback circuit, the feedback circuit can be reduced to a feedback-free circuit, greatly simplifying the calculation. Especially when we can skillfully After using the alternative theorem, for the analysis and calculation of the feedback circuit, sometimes you do not need to draw the equivalent circuit and list the loop equation, but can write the result directly.