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Question
A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 2000Ω. The power gain of the amplifier is ______.
Options
500
1000
1250
50
MCQ
Fill in the Blanks
Solution
A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 2000Ω. The power gain of the amplifier is 1250.
Explanation:
Power gain = voltage gain × current gain
= VG.IG = `"V"_0/"V"_"i"."I"_0/"I"_"i"`
= `"V"_0^2/"V"_"i"^2."R"_"i"/"R"_0`
= 50 × 50 × `100/200`
= 1250
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Bipolar Junction Transistor (BJT)
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