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Question: A transistor is used as an amplifier in CB mode with a load resistance of 5 kW the current gain of a...

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

A

70, 68.6

B

80, 75.6

C

60, 66.6

D

90, 96.6

Answer

70, 68.6

Explanation

Solution

a = ICIE\frac{I_{C}}{I_{E}}= 0.98

Va = a RLRin\frac{R_{L}}{R_{in}}= 0.98 × 5×10370\frac{5 \times 10^{3}}{70}

Pa = a2 RLRin\frac{R_{L}}{R_{in}} = (0.98)2 × 5×10370\frac{5 \times 10^{3}}{70}