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Author Topic: What is an amplifier?  (Read 3489 times)

Number1Sound

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What is an amplifier?
« on: May 17, 2009, 11:17:49 PM »
Generally, an amplifier or simply amp, is any device that changes, usually increases, the amplitude of a signal. The "signal" is usually voltage or current.

The relationship of the input to the output of an amplifier usually expressed as a function of the input frequency, is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.

The gain of an amplifier is the ratio of output to input power or amplitude, and is usually measured in decibels.
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