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Q.

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

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a

70, 68.6

b

80, 75.6

c

60, 66.6

d

90, 96.6

answer is A.

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Detailed Solution

In common base mode, $α = 0.98, R_{L} = 5 kΩ, R_{in} = 70 Ω$

$∴ Voltage gain A_{v} = α \times \frac{R_{L}}{R_{in}} = 0.98 \times \frac{5 \times 10^{3}}{70} = 70$

Power gain = Current gain x Voltage gain

= 0.98 x 70 =68.6

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