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Question

A common base transistor amplifier has a current gain of 50. If the load resistance is 4kΩ, and input resistance is 500Ω, the voltage gain of amplifier is

A
100
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B
200
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C
300
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D
400
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Solution

The correct option is D 400
Given that:
β=50
RL=4 kΩ=4000Ω
Ri=500Ω
Hence, resistance gain is
RLRi=4000500=8
For CB amplifier, voltage gain is,
Voltage gain = Current gain × Resistance gain
Voltage gain = 50 × 8
Voltage gain = 400.

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