A transistor is used as an amplifier in common base mode with a load resistance of 5 k Ω . If the current gain of amplifier is 0.98 and the input resistance is 70 Ω , then voltage gain and power gain respectively are

Question

A transistor is used as an amplifier in common base mode with a load resistance of 5 k Ω . If the current gain of amplifier is 0.98 and the input resistance is 70 Ω , then voltage gain and power gain respectively are, 70 , 68.6, 80 , 75.6, 60 , 66.6, 90 , 96.6

MARKS App · Accepted Answer

Current gain in common base mode α = I C I E = 0.98 Voltage gain A V = α R L R i n = 0.98 × 5 × 1 0 3 70 ⇒ A V = 70 Power gain A P = a 2 R L R i n = 0.98 2 × 5 × 1 0 3 70 ⇒ A P = 68.6

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