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From the given circuit, using a silicon transistor, what is the value of IBQ?

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in Analog Circuits by (87.8k points)
From the given circuit, using a silicon transistor, what is the value of IBQ?

(a) 47.08 mA

(b) 47.08 uA

(c) 50 uA

(d) 0 mA

I have been asked this question in examination.

Question is taken from BJT DC biasing in division BJT Biasing of Analog Circuits

1 Answer

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Best answer
Correct choice is (b) 47.08 uA

The best I can explain: Consider the BJT to be in saturation. Then IC=12-0.2/2.2k=5.36 mA

And IB=12-0.8/240k=0.047 mA

IBMIN=ICSAT/β=5.09/50=0.1072mA which is greater than above IB.

Hence transistor is in the active region.

Thus IC=βIB.

VBE=0.7V

IB=12-0.7/240=47.08μA

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