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 ______.

पर्याय

• 500 

• 1000

• 1250

• 50

Answer 1

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

= V_G.I_G = `"V"_0/"V"_"i"."I"_0/"I"_"i"`

= `"V"_0^2/"V"_"i"^2."R"_"i"/"R"_0`

= 50 × 50 × `100/200`

= 1250