2. (a) Derive the common-mude rojection ratio (-ADACH OM) of the stages in Fig. 4. For simplicity, neglect channel-length modulation in Mr und M. but not in other transistors. Voo Ro Rp+ARD Voutt Voul2 ViniHM, Vina

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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.