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【简答题】
共射-共基两级放大电路如图2-30所示。已知：U CC =12V，U BE =U BE1 =U BE2 =0.7V，R s =100Ω，R b =551kΩ，R c1 =1.5KΩ，R c2 =1kΩ，R e1 =2kΩ，R e2 =1.3kΩ，r bb' =r bb'1 =r bb'2 =100Ω，R b1 =10kΩ，R b2 =4.9kΩ，β=β 1 =β 2 =100，R L =10kΩ。 (1) 计算电路的静态工作点Q 1 、Q 2 ； (2) 画出电路的微变等效电路图； (3) 求输入电阻R i 和输出电阻R o ； (4) 计算电压放大倍数A u 、A us 。
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举一反三
【单选题】After ten years in the shoe trade, Colin's contacts are in the retail sector. (primarily)
A.
Primarily, after ten years in the shoe trade, Colin's contacts are in the retail sector.
B.
After ten years in the shoe trade, Colin's contacts are primarily in the retail sector.
【单选题】I want to live in the moon . [ ]
A.
in ten years
B.
ten years ago
C.
after ten years
D.
later ten years
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