1. Ibq=(Ucc-Ubeq)/Rb=(12V-0.7V)/300kΩ=0.0377mA
Icq=βIbq=60x0.0377mA=2.26mA
Uceq=Ucc-RcIcq=12V-3kΩx2.26mA=5.2V
2. 微变等效电路
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/3ac79f3df8dcd100c001850a738b4710b9122f7f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3. 输入电阻Ri≈rbe=rbb+UT/Ibq=100Ω+26mV/0.0377mA=100Ω+690Ω=790Ω
输出电阻Ro=Rc=3kΩ
电压放大倍数Au=-βRc//RL/rbe=-60x3//3/0.79=-60x1.5/0.79=-114
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