An amplifier operating from a ±15 V DC supply provides an output voltage of 20 V peak-to-peak and an output current of 23 mA peak to a resistive load when a signal of 2 V peak is connected to its input. The current drawn by the input port of the amplifier is 2 mA rms. A current of 15 mA DC is provided by each DC power supply. For this amplifier, calculate: the voltage gain in dB the current gain in dB  the power gain in dB the efficiency (as a percentage) the input resistance in Ohms

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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.