4. (a) Calculate Po(ac), Pi(dc), maximum input power & circuit efficiency (n) for an input of 15V rms for the circuit of figure3. [Consider the amplifier has ideally a voltage gain of unity]. Vi=15 V rms o R₁10002 C=40 µF R₂10092 RE=192 RE=192 Fig 3 OVL Vcc1=20V RL 322Ω |+ Vcc2-20 V

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Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.