Transistor

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Question

A transistor connected in common emitter configuration has input resistance $R_{in} = 2 kΩ$ and load resistance of $5 kΩ$ . If $β = 60$ and an input signal 12 mV is applied. The power gain is

Moderate

Solution

$Power gain of a transistor = current gain \times voltage gain$
$and voltage gain is β \frac{R_{L}}{R_{in}} = 60 \times \frac{5 \times 10^{3}}{2 \times 10^{3}} = 150$
$power gain is 60 \times 150 = 9000$

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