动态分析 1、电压放大倍数 R Uo=Ie(RE//R=(1+B)I(RE//R US R i Ib Rbe +le re/ru R1 bR1c+(1+B)16(R/R1) R (1+B)(RE/R1) 射极输出器电压放大倍数小于1 R1+(1+p)(RE/R1)而接近于1 2、输入电阻 (RE/RI →R1=:=R+(1+p)(RE/R1) b Rbe +(1+B)Ib (rE//ru R;=RB∥/R 射极输出器具有很高的输入电阻三、动态分析 1、电压放大倍数 Uo =Ie (RE //RL )=(1+β)Ib (RE //RL ) Ui= Ib Rbe + Ie (RE //RL ) = Ib Rbe +(1+β) Ib (RE //RL ) Uo Ui AU = = Rbe + (1+β) (RE //RL) (1+β) (RE //RL) 2、输入电阻 Ui= Ib Rbe + Ie (RE //RL ) = Ib Rbe +(1+β) Ib (RE //RL ) Ri / = = Rbe+(1+β) (RE //RL ) Ui Ib Ri = RB // Ri / βIb Ui RL Uo Rbe Ib RE RS + - US RB Ie Ic Ri Ri / Ii 射极输出器具有很高的输入电阻 射极输出器电压放大倍数小于1 而接近于1；