source signal is sampled, quantized, and encoded into PCM with pulse shaping. The corresponding information rate of the PCM signal is 2 kHz. The maximum permissible source bandwidth, the 6-dB bandwidth and the transmission bandwidth are found to be 1 kHz, 3 kHz and 6 kHz, respectively. (i) The rolloff

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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.