【摘要】 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。更多还原

【Abstract】 The application properties of eded and simplied π-Models for bipolar transistors are disscused. A relationship of the upper cut-off frequency between two equivalent circuits is derived through analyzing an amplifier with the two models. On the basis of characteristic curves simulated by PSPICE software, the application range of the simplified π-Model is also determined.更多还原