模拟电子线路的习题

7.9 图a、NPN硅管，放大状态；图b、NPN管，截止状态；图c、NPN硅管，饱和状态；8.11、静态值 IbQ = ( 6 - 0.7 )/200 = 0.0265 mA；IcQ =βIbQ = 50 *0.0265 = 1.325 mA；UceQ = 6 - 2 *1.325 = 3.35v；2、Ic = ( 6 - 3 )/2 = 1.5 mA；Ib = 1.5/50 = 0.03 mA；Rb = 5.3/0.03 = 177 kΩ 。8.3 Re = [ Ve - (-10) ]/IeQ = ( -0.7 + 10 )/(1.5 * 51/50 ) = 6 kΩ；Rc = ( 10 - Vc )/IeQ = ( 10 - 4 )/1.5 = 4kΩ；8.5输入电阻ri = rbe//Rb≈ rbe≈ rbb + (β + 1 ) * 26/IcQ = 200 + 51 * 26/1.325 = 1200Ω；输出电阻ro = Rc//RL = 2//6 = 1500Ω；Au = βro/ri = 50 * 1500/1200 = 62.5 。