1.

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 mAI have been asked this question in examination.Question is taken from BJT DC biasing in division BJT Biasing of Analog Circuits

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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