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An amplifier or electronic amplifier is an electronic device that can increase the power of a signal (voltage or current that changes over time). It is a dual port electronic circuit that uses power from the power supply to increase the amplitude (voltage or current amplitude) of the input signal applied to it, thereby generating a proportionally larger amplitude signal at its output. The amplification provided by an amplifier is measured by its gain, which is the ratio of output voltage, current, or power to input. An amplifier is a circuit with a power gain greater than 1

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