【单选题】听力原文:[Professor] Today, we'll discuss the invaluable things .eh.. It's hard to distinguish the tree treasure. Now, I will tell you a story: When an American teenager named Joshua wanted a bass, his fa...
【简答题】单极共射基本放大电路如图2-6所示,已知三极管的U BE =0.7V,β=50,R b =377kΩ,R c =6kΩ,R s =100Ω,R L =3kΩ,U CC =+12V,试求 (1) 电路的静态工作点Q。 (2) 电压放大倍数A u 、A us 。 (3) 输入电阻R i 、输出电阻R o 。 (4) 画出输出回路的直流和交流负载线。 (5) 求电路输出幅度U om ,用有效值表示。 (...