【简答题】放大电路如图所示,已知Rb1=10kΩ,Rb2=51kΩ,Rc=3kΩ,Re=500Ω,Ucc=12V,β=30,试求: (1)静态工作点ICQ和UCEQ。 (放大电路如图所示, 已知RB1=60kΩ,RB2=20kΩ,RC=3kΩ,RE=2kΩ,RL=6kΩ,UCC=16V,三极管电流放大系数β=60. (1)求静态工作点; (2)求输入电阻Ri、输出电阻Ro和电压放大倍数Au;
【单选题】放大电路如图2.10所示,已知:R B =240kfΩ,R C =3kΩ,晶体管β=20,U CC =12V。现该电路中的三极管损坏,换上一个β=40的新管子,若要保持原来的静态电流I C 不变,且忽略U BE ,应把R B 调整为( )。
【单选题】— Do you think it is a good idea to make friends with your students? — _____, I do. I think it is a great idea. [ ]
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ,RB2=10kΩ,RC=RE= 2kΩ,RL=3kΩ,UCC=20V,三极管的电流放大系数β=60,计算电压放大倍数。【图片】
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ,RB2=10kΩ,RC=RE= 2kΩ,RL=3kΩ,UCC=20V,三极管的电流放大系数β=60,输入电阻为( )KΩ,输出电阻为( )KΩ。【图片】
【简答题】如图15-44所示电路,已知U CC =20V,R B =120kΩ,R E =R L =3.6kΩ,β=100,静态时U CE =5.5V,R S =3kΩ(1)试求r i ,A u ,r o ;(2)若R S =300Ω,求输出电阻r o ;(3)若R S =30kΩ,求r 0 ;(4)将(1),(2),(3)的计算结果作比较,说明射极输出器特点。
【单选题】— Do you think it is right? — Yes, _____________. [ ]
【单选题】—Do you think it is easy to learn English well? —I don't think so, but I find interesting to learn this language. [ ]