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NEET2018PhysicsSemiconductorsActual

In a common emitter (CE) amplifier having a voltage gain A_v , the transistor used has transconductance 0.03 mho and current gain 25. If this transistor is replaced with another one with transconductance 0.02 mho and current gain 20 , the voltage gain will be

Options

  1. A2 3 A_v
  2. BA_v
  3. C3 2 A_v
  4. DA_v 2

Correct answer

A. 2 3 A_v

Step-by-step solution

aligned & A_v= R_ out R_ in =25 R_ out R_ in & G_m= R_ in R_ in = G_m = 25 0.03 & A_v=25 R_ out 25 0.03 & Now, A_v^ =20 R_ out 20 0.02 & A_v^ = 2 3 A_v aligned

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