A resistive load of 4 ohms is matched to the collector impedance of an amplifier by means of a transformer having a turn ratio of 40:1. The amplifier uses a DC supply voltage of 12V in the absence of input signal. When signal is present at the base, the collector voltage swings between 22V and 2V, while the collector current swings between 0.9A and 0.05A. Determine: (a) the collector impedance                    (b) Signal power output                    (c) DC power input

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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.