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Q.

A transistor is used in common – emitter mode in an amplifier circuit. When a signal of 20 mV is added to the base – emitter voltage, the above current changes by 20μAand the collector current changes by 2 mA. The load resistance is 5kΩ . Calculate a) The input resistance RBE, b) The transconductance and c) The voltage gain.

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a

100Ω, 10mho, 10

b

100Ω, 1mho, 50

c

1000Ω, 0.1mho, 500

d

50Ω, 10mho, 100

answer is C.

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Detailed Solution

a) The input resistance RBE=ΔVBEΔIB=20mV20μA=1kΩ b) Transconductance =ΔICΔVBE=2mA20mV=0.1mhoc) The Change in output voltage is =RLΔ IC =(5kΩ)(2mA)=10V The applied signal , voltage = 20mV Thus , the voltage gain is, VoutVin=10V20mV=500

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