Modern Physics 6 Question 9

9. In the figure, given that VBB supply can vary from 0 to 5.0V, VCC=5V,βDC=200,RB=100kΩ,RC=1kΩ and VBE=1.0V. The minimum base current and the input voltage at which the transistor will go to saturation, will be, respectively

(Main 2019, 12 Jan II)

(a) 25μA and 2.8V

(b) 25μA and 3.5V

(c) 20μA and 3.5V

(d) 20μA and 2.8V

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Solution:

  1. Transistor saturation occurs when VCE=0.

Now, for closed loop of collector and emitter by

Kirchhoff’s voltage rule, we have

VCE=VCCICRC0=VCCICRcIC=VCCRC=51×103=5×103A

Now, βDC=200 (given) ICIB=βDC=200

IB=IC200=5×103200IB=2.5×105=25μA

Now, we apply Kirchhoff’s voltage rule in base-emitter closed loop, we get



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