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# 5-放大电路的频率响应.ppt - 5.1 5.2 5.3 5.1 1 U I U...

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§5.1 频率响应的有关概念 一、本章要研究的问题 二、高通电路和低通电路 三、放大电路中的频率参数

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§5.2 晶体管的高频等效电路 -- 考虑 结电容 的影响 一、混合 π 模型 二、电流放大倍数的频率响 三、晶体管的频率参数
1. 模型的建立 ：由结构而建立，形状像 Π ，参数量纲各不相 同。 g m 为跨导，它不随 信号频率的变化而变。 阻值小 阻值大 连接了输入回 路和输出回路 一、混合 π 模型

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2. 混合 π 模型的单向化 （简化电路分析） ' L m μ e b' μ ce e b' μ ) 1 ( R g k X U k X U U I C C C ' L m μ μ e b' μ ' 1 R g X I U X C C C μ ' L m ' μ ) 1 ( C R g C μ ' ' μ 1 C k k C 同理可得， 等效变换后电流不变
3. 晶体管简化的高频等效电路 ' μ π ' π EQ T 0 e b' μ bb' ) 1 ( C C C I U r C r 可从手册查得 T EQ e b' 0 m e b' b m e b' m b 0 U I r g r I g U g I

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