2-27
Rb*Ib + Ube + Re*(Ib+Ic)= Ucc;
Ic = Ib*β;
可解得 Ib,Ic;
Uce = Ucc - Ue; Ue = Re*(Ib+Ic)= Re*Ib*(1+β);
输入阻抗:Ri = Rb//(rbe+Re*(1+β));输出阻抗:Ro = Re//RL;
Au = Ue/Ui = Ib*(1+β)*Ro/Ri*Ib =<1;