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Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (ri), and (b) current amplification factor β. Input charcteristics: It is the graph drawn between input current and input voltage when output voltage is kept constant. Output characteristics : It is the graph drawn between output current and output voltage when input current is kept constant. (a) Input resitance (Ri =[Change in emitter base voltage(△VBE)Change in base current(△IB)]at constantVCE or Ri=(△VBE△IB)VCE (b) Current amplification factor, (β)=(△IC△IB)VCE = △IC△IE−△IC = △IC△IE△IC△IE−△IC△IE = α1−α ⇒ β=α1−α |
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Answer» Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (ri), and (b) current amplification factor β. Input charcteristics: It is the graph drawn between input current and input voltage when output voltage is kept constant.  Output characteristics : It is the graph drawn between output current and output voltage when input current is kept constant.  (a) Input resitance (Ri =[Change in emitter base voltage(△VBE)Change in base current(△IB)]at constantVCE or Ri=(△VBE△IB)VCE (b) Current amplification factor, (β)=(△IC△IB)VCE = △IC△IE−△IC = △IC△IE△IC△IE−△IC△IE = α1−α ⇒ β=α1−α |
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