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NEET2013PhysicsSemiconductorsActual

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

Options

  1. A2 3 G
  2. B1.5 G
  3. C1 3 G
  4. D5 4 G

Correct answer

A. 2 3 G

Step-by-step solution

As A_v= R_L R_j [ g_m= _C V_B = _C /_B R_j ] or G= ( R_i ) R_L [ g_m= R_i ] array ll & G=g_m R_i & G g_m array aligned & G₂ G₁ = g_ m₁ g_ m₂ & G₂= 0.02 0.03 G & Voltage gain G₂= 2 3 G aligned

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