voltage amplifier is used to amplify radio signals from the antenna in a car radio system. The incoming radio signal voltage from the antenna, vs = 500 mV and its resistance is Rs = 100 N. Assume the open circuit voltage gain of the amplifier, 100 and the output resistance is 1 k. i. Design the amplifier by finding its input resistance, R; if the amplifier voltage gain (vo/vs) is given as 20.  ii. If the amplifier output is connected to a speaker (load), find the new amplifier voltage gain (vo/vs) if the load resistance, R1, value is 1 kN.

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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.