/am"pleuh fuy'euhr/, n.1. a person or thing that amplifies or enlarges.2. an electronic component or circuit for amplifying power, current, or voltage.[1540-50; AMPLIFY + -ER1]
* * *Device that responds to a small input signal (voltage, current, or power) and delivers a larger output signal with the same waveform features.Amplifiers are used in radio and television receivers, high-fidelity audio equipment, and computers. Amplification can be provided by electromechanical devices (e.g., transformers and generators) and vacuum tubes, but most electronic systems now employ solid-state microcircuits. One amplifier is usually insufficient, so its output is fed into a second, whose output is fed to a third, and so on, until the output level is satisfactory.
* * *in electronics, device that responds to a small input signal (voltage, current, or power) and delivers a larger output signal that contains the essential waveform features of the input signal. Amplifiers of various types are widely used in such electronic equipment as radio and television receivers, high-fidelity audio equipment, and computers. Amplifying action can be provided by electromechanical devices (e.g., transformers and generators) and vacuum tubes, but most electronic systems now employ solid-state microcircuits as amplifiers. Such an integrated circuit consists of many thousands of transistors and related devices on a single tiny silicon chip.A single amplifier is usually insufficient to raise the output to the desired level. In such cases the output of the first amplifier is fed into a second, whose output is fed to a third, and so on, until the output level is satisfactory. The result is cascade, or multistage amplification. Long-distance telephone, radio, television, electronic control and measuring instruments, radar, and countless other devices all depend on this basic process of amplification. The overall amplification of a multistage amplifier is the product of the gains of the individual stages.There are various schemes for the coupling of cascading electronic amplifiers, depending upon the nature of the signal involved in the amplification process. Solid-state microcircuits (integrated circuit) have generally proved more advantageous than vacuum-tube circuits for the direct coupling of successive amplifier stages. Transformers can be used for coupling, but they are bulky and expensive.An electronic amplifier can be designed to produce a magnified output signal identical in every respect to the input signal. This is linear operation. If the output is altered in shape after passing through the amplifier, amplitude distortion exists. If the amplifier does not amplify equally at all frequencies, the result is called frequency distortion, or discrimination (as in emphasizing bass or treble sounds in music recordings).When the power required from the output of the amplifier is so large as to preclude the use of electronic devices, dynamoelectric and magnetic amplifiers find wide application.
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amplifier — [ ɑ̃plifje ] v. tr. <conjug. : 7> • XV e; amplier XIIIe; lat. amplificare 1 ♦ Agrandir, augmenter les dimensions, l intensité de (spécialt à l aide d amplificateurs). Amplifier une image, un courant. Pronom. Prendre plus d amplitude, d… … Encyclopédie Universelle
amplifier — Amplifier. v. a. Estendre, augmenter. Il ne se dit qu en parlant de discours. Amplifier un discours. amplifier une nouvelle. il amplifie tousjours les choses … Dictionnaire de l'Académie française
amplifier — AMPLIFIER.v. a. Étendre, augmenter par le discours. Amplifier une nouvelle. Il amplifie toujours les choses. Il amplifie tout ce qu il dit. Amplifié, ée. participe … Dictionnaire de l'Académie Française 1798
amplifier — (izg. èmplifajer) m DEFINICIJA tehn. žarg., v. pojačalo (1) ETIMOLOGIJA engl. ← stfr. amplifier: pojačavati, povećavati ← lat. amplificare … Hrvatski jezični portal
Amplifier — Am pli*fi er, n. One who or that which amplifies. [1913 Webster] … The Collaborative International Dictionary of English
Amplifier — Allgemeine Informationen Genre(s) Alternative Rock, Psychedelic Rock … Deutsch Wikipedia
amplifier — amplifiér s. n. Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic … Dicționar Român
amplifier — (n.) 1540s; agent noun from AMPLIFY (Cf. amplify). Electronic sense is from 1914; shortened form amp is from 1967 … Etymology dictionary
amplifier — ► NOUN 1) an electronic device for increasing the strength of electrical signals. 2) a device of this kind combined with a loudspeaker, used to amplify electric guitars and other musical instruments … English terms dictionary
amplifier — [am′plə fī΄ər] n. 1. a person or thing that amplifies 2. Electronics a device that increases the strength of a weak electrical signal without changing the other characteristics of the signal … English World dictionary
Amplifier — For other uses, see Amplifier (disambiguation). Generally, an amplifier or simply amp, is a device for increasing the power of a signal. In popular use, the term usually describes an electronic amplifier, in which the input signal is usually a… … Wikipedia