Modern Physics 6 Question 8

8. A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its DC current gain is 250 , RC=1kΩ and VCC=10V. What is the minimum base current for VCE to reach saturation?

(Main 2019, 8 April II)

(a) 40μA

(b) 10μA

(c) 100μA

(d) 7μA

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Solution:

  1. For a common emitter npn transistor, DC current gain is

βDC=ICIB

At saturation state, VCE becomes zero.

VCCICRC=0ICVCCRC=101000=102A

Hence, saturation base current,

IB=ICβDC=102250=40μA



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