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讨论了晶体管混合π模型与简化π模型在应用中的特点，导出了使用这两种模型分析放大器时，两个等效电路上限截止频率之间的关系，并给出了由ＰＳＰＩＣＥ软件包仿真数据绘制的曲线，从而对简化π模型的应用范围得出了明确的结论。
The characteristics of transistor mixed π model and simplified π model are discussed. The relationship between the upper limit cut-off frequency of two equivalent circuits and the simulation data derived from the PSPICE software package is given when the two models are used to analyze the amplifier. Draw the curve, so as to simplify the application range of π model reached a clear conclusion.