An NPN transistor is used in common emitter configuration as an amplifier with 1kΩ load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15μA change in the base current of the amplifier. The input resistance and voltage gain are:
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a
0.33kΩ,300
b
0.67kΩ,300
c
0.33kΩ,1.5
d
0.67kΩ,200
answer is B.
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Detailed Solution
ICIB=200 , IBRi=V , Ri=23k ohm=0.67k ohm Voltage gain = ICIB×RCRI=200×100023×1000=300