1)画出交流等效电路和微变电路;
2)因为 Rsi=0,RL=∞;
所以:Uo = Ic*(Rc//RL) = Ic*Rc ;Ui = Ib*rbe;==》Au = Uo/Ui = β*Rc/rbe;
输入电阻:Ri = Ui/Ie = Ib*rbe/Ie = rbe/(1+β);
输出电阻:Ro = Rc;
3)解 rbe;因为发射极电流就是电流源的电流,即 Ie =1.01mA;
则按公式,有 rbe = rbb + (1+β)* 26(mV)/Ie; 取 rbb=300Ω;
好了,具体数值你自己去计算吧;