一道电工题,求答案及解析,可以提高悬赏,请认真写
1个回答
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1、静态工作点:
Vb=[RB1/(RB1+RB2)]Ucc=[10K/(33K+10K)]24=5.58V
Ve=Vb-0.7=4.88V
Ie=Ve/Re=4.88/1.5K=3.25mA≈Ic
Ib=Ic/β=3.25/66=49uA
Vce=Ucc-Ic(Rc+Re)=24-3.25x4.8=8.4V
2、动态参数:
rbe=300+(1+β)26mV/Ie=300+66x26/3.25=828Ω=0.828K
Av=-β(Rc//RL)/rbe=-66x1.03/0.828≈-82
Ri=Rb1//Rb2//rbe=33K//10K//0.828K≈0.75K
Ro=Rc=3.3K
Vb=[RB1/(RB1+RB2)]Ucc=[10K/(33K+10K)]24=5.58V
Ve=Vb-0.7=4.88V
Ie=Ve/Re=4.88/1.5K=3.25mA≈Ic
Ib=Ic/β=3.25/66=49uA
Vce=Ucc-Ic(Rc+Re)=24-3.25x4.8=8.4V
2、动态参数:
rbe=300+(1+β)26mV/Ie=300+66x26/3.25=828Ω=0.828K
Av=-β(Rc//RL)/rbe=-66x1.03/0.828≈-82
Ri=Rb1//Rb2//rbe=33K//10K//0.828K≈0.75K
Ro=Rc=3.3K
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