Īn amplifier can either be a separate piece of equipment or an electrical circuit contained within another device. An amplifier is a circuit that has a power gain greater than one. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The graph shows the input v i ( t ) Īn amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). Amplification means increasing the amplitude (voltage or current) of a time-varying signal by a given factor, as shown here.
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