Amplifier

An amplifier, electronic amplifier is an electronic device that can increase the power of a signal.
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 amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one.
Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment.

Gain, the ratio between the magnitude of output and input signals
Bandwidth, the width of the useful frequency range
Efficiency, the ratio between the power of the output and total power consumption
Linearity, the extent to which the proportion between input and output amplitude is the same for high amplitude and low amplitude input
Noise, a measure of undesired noise mixed into the output
Output dynamic range, the ratio of the largest and the smallest useful output levels
Slew rate, the maximum rate of change of the output
Rise time, settling time, ringing and overshoot that characterize the step response
Stability, the ability to avoid self-oscillation

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