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BITSAT2017PhysicsSemiconductorsActual

A common emitter amplifier has a voltage gain of 50 , an input impedance of 100 Ω and an output impedance of 200 Ω . The power gain of the amplifier is

Options

  1. A500
  2. B1000
  3. C1250
  4. D50

Correct answer

C. 1250

Step-by-step solution

Voltage gain = β × impedance gain ⇒   50 = β × 200 100 ⇒   β = 25 Also power gain = β 2 × impedance gain = 25 2 × 200 100 = 1250

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