Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.

Let A₁ = 10 (Voltage gain of the first amplifier)

and A₂ = 20 (Voltage gain of the second amplifier)

V_i = 0.01 V (Input signal voltage)

Let, Output AC signal voltage = V_o

We have the relation:

V₀ = A × V_i

_{Output after the first stage VO1} = A₁ × V_i

_{Then, output after the 2}^nd stage V_O2 = V_O1 × A₂ = V_i × A₁ × A₂

_{Hence, the final output = VO} = 20 × 10 × 0.01 = 2 Volts

Therefore, the output AC signal of the given amplifier is 2 V.