First slide

Transistor

Question

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 $k Ω$ . If current gain is 100 and the base resistance is 2 $k Ω$ , the voltage and power gain of the amplifier is

Moderate

A

15 and 200
B

150 and 15000
C

20 and 2000
D

200 and 1000

Solution

$Given: V_{i} = 3 V, R_{C} = 3 k Ω, R_{p} = 2 k Ω, β = 100$
Voltage gain of the CE amplifier,
$A_{V} = - β_{a c} (\frac{R_{C}}{R_{B}}) = - 100 (\frac{3}{2}) = - 150$
Power gain, $A_{P} = β \times A_{V} = 100 \times (- 150) = - 15000$
Negative sign represents that output voltage is in opposite phase with the input voltage.

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