单管晶体管放大电路如图所示,已知Ucc=12V,RC=RL=3KΩ,RB=240Ω,晶体管的β=40 求rbe 求输入和输出电阻

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摘要 : (1) R B =100K Ω, I B =(3-0.7)V/100KΩ=0.023mA I C = βI B = 100×0.023=2.3mA I Cmax = 12V/3 KΩ = 4mA I C I Cmax 晶体管处于放大状态,则 U CE =12 - (3×2.3) = 5.1V (2) R B = 51 KΩ I B = (3-0.7)V / 51KΩ = 0.045mA I Cmax =12V / 3 KΩ = 4mA 因β I B = 100 × 0.045mA = 4.5mA > I Cmax = 4mA ,所以晶体管饱和,则 I B = 0.045mA I C = 12V/3 KΩ = 4mA U CE ≈ 0

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单管晶体管放大电路如图所示,已知Ucc=12V,RC=RL=3KΩ,RB=240Ω,晶体管的β=40 求rbe 求输入和输出电阻

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: (1) R B =100K Ω, I B =(3-0.7)V/100KΩ=0.023mA I C = βI B = 100×0.023=2.3mA I Cmax = 12V/3 KΩ = 4mA I C I Cmax 晶体管处于放大状态,则 U CE =12 - (3×2.3) = 5.1V (2) R B = 51 KΩ I B = (3-0.7)V / 51KΩ = 0.045mA I Cmax =12V / 3 KΩ = 4mA 因β I B = 100 × 0.045mA = 4.5mA > I Cmax = 4mA ,所以晶体管饱和,则 I B = 0.045mA I C = 12V/3 KΩ = 4mA U CE ≈ 0

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