开路短路法在基本放大电路输出电阻求解中的应用

Application of Open Circuit and Short Circuit to Solution of Basic Amplifying Circuit Output Resisitence

输出电阻是放大电路的一个主要性能指标,在教学中一般用外加电源法、实验测法求解,学生难易理解和掌握。本文用等效电源模型定义输出电阻,得到物理意义明确的输出电阻,提出"开路短路法"求解输出电阻的方法,并针对三种组态的基本放大电路输出电阻的分析求解验证了该方法的有效性。

The output resistence is the main performance index of the amplifying circuit. The paper utilizes the equivalent source model to define the output resistence, and obtain the output resistence with clear physical significence, and presents the open circuit and short circuit to solution to the output resistence, and vertifies its vadility with three kinds of basic amplying circuit.