A transistor is used as an amplifier in CB mode with a load resistance of 5 k Ω Ω the current gain of amplifier is 0.98 and the input resistance is 70 Ω Ω , the voltage gain and power gain respectively are
Text Solution
Verified by ExpertsThe correct answer is:
A
In common base mode α α = 0.98, R = 5 k Ω Ω , R in = 70 Ω Ω
∴ ∴ voltage gain 
Power gain = Current gain × × Voltage gain
= 0.98 × × 70 = 68.6
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