A three-stage amplifier has a first stage voltage gain of 100, second stage voltage gain of 200 and third stage voltage gain of 400.

A three-stage amplifier has a first stage voltage gain of 100, second

1.	A three-stage amplifier has a first stage voltage gain of 100, second stage voltage gain of 200 and third stage voltage gain of 400.
Answer» A₁ = 100, A₂ = 200, A₃ = 400. A_Total A₁ x A₂ x A₃ = 100 x 200 x 400 = 8 x 10⁶ Gain in dB = 20 logA = 20 log 8 x 10⁶ = 20 x (6.9031) = 138.02dB.