Amplifier | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-02

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Amplifier


00:01:48 1 History
00:07:44 2 Ideal
00:09:37 3 Properties
00:10:17 4 Negative feedback
00:12:48 5 Categories
00:15:38 5.1 Active devices
00:15:47 5.2 Power amplifiers
00:18:45 5.3 Operational amplifiers (op-amps)
00:20:35 5.4 Distributed amplifiers
00:21:33 5.5 Switched mode amplifiers
00:22:21 5.6 Negative Resistance Amplifier
00:22:45 5.7 Applications
00:23:23 5.7.1 Video amplifiers
00:23:32 5.7.2 Microwave amplifiers
00:24:15 5.7.3 Musical instrument amplifiers
00:25:24 6 Classification of amplifier stages and systems
00:25:45 6.1 Common terminal
00:25:57 6.2 Unilateral or bilateral
00:27:23 6.3 Inverting or non-inverting
00:28:18 6.4 Function
00:29:17 6.5 Interstage coupling method
00:34:45 6.6 Frequency range
00:36:52 7 Power amplifier classes
00:39:00 8 Example amplifier circuit
00:39:53 9 Notes on implementation
00:43:23 10 See also



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SUMMARY
=======
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). 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.An amplifier can either be a separate piece of equipment or an electrical circuit contained within another device. Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment. Amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified. For example, audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz, and servo amplifiers and instrumentation amplifiers may work with very low frequencies down to direct current.   Amplifiers can also be categorized by their physical placement in the signal chain; a preamplifier may precede other signal processing stages, for example.  The first practical electrical device which could amplify was the triode vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers around 1912.  Today most amplifiers use transistors.