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Question

For a common emitter amplifier, current gain is 50. What is the current gain if it is working as common base amplifier?

A
1.02
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B
0.98
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C
98
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D
1
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Solution

The correct option is B 0.98
The common emitter amplifier can be represented schematically as:


The common base amplifier can be represented schematically as:


For common emitter, the current gain β=iCiB
For common base, the current gain
α=iCiE

We know iE=iB+iC
Dividing both sides by iC
iEiC=iBiC+iCiC
1α=1β+1

Given β=50
From the above expression,
α=ββ+1=5051
i.e α=0.98

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