preamplifier


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preamplifier

(pree-am -plă-fÿ-er) An amplifier used in a radio telescope to boost the signals from the antenna before they are fed to the receiver.

preamplifier

[prē′am·plə‚fī·ər]
(electronics)
An amplifier whose primary function is boosting the output of a low-level audio-frequency, radio-frequency, or microwave source to an intermediate level so that the signal may be further processed without appreciable degradation of the signal-to-noise ratio of the system. Also known as preliminary amplifier.

Preamplifier

A voltage amplifier suitable for operation with a low-level input signal. It is intended to be connected to another amplifier with a higher input level. Preamplifiers are necessary when an audio amplifier is to be used with low-output transducers such as magnetic phonograph pickups. A preamplifier may incorporate frequency-correcting networks to compensate for the frequency characteristics of a given input transducer and to make the frequency response of the preamplifier-amplifier combination uniform. See Amplifier, Voltage amplifier

preamplifier

(1) In the hi-fi stereo and home theater worlds, a preamplifier accepts signals from audio and video sources and feeds them to the amplifier and screen. For details, see preamp.

(2) An electronic device that boosts signals to a certain level, which may be further amplified. Preamplifiers are used in fields such as test and measurement, optical detection and audio engineering.
References in periodicals archive ?
Selectable parameters include microphone preamplifier game, electret power on/off, stereo line input gain, headphone monitoring, pushbutton action, and overall system operation.
In the system with the FOPA preamplifier the highest BER values were observed in the 14th channel, where one of the lowest gain is observed.
Thus a preamplifier circuit is required which amplifies the required signals and remove unwanted signals i.e.
3.1 Preamplifier's frequency response at different gain settings
Starting with a phonograph preamplifier, PS Audio quickly emerged as a top brand in high-end audio.
15, 2011 /PRNewswire/ -- ACCELERATING INNOVATION SUMMIT -- LSI Corporation (NYSE: LSI) today announced the TrueStore[R] PA5100 and PA5200, the company's latest high-performance, low-power preamplifier integrated circuits (IC) for the notebook, desktop and enterprise hard disk drive (HDD) market segments.
22 -- Meggitt Sensing Systems has introduced the Endevco model EM46AE, a combined 1/2" free-field pressure microphone and iTEDS enabled preamplifier (per IEEE 1451.4) set, designed for general purpose and larger channel count precision acoustic measurements within a variety of applications, including vehicle pass-by noise testing; environmental noise analysis; building acoustics; and appliance and other consumer product noise evaluations.
The compact system has laptop capability and features remote control and an impedance display on the preamplifier, allowing the tester to move away from the computer and be in close contact with the patient.
Worldwide Computer Products News-5 November 2007-LSI introduces PA2500 preamplifier integrated circuit(C)1995-2007 M2 COMMUNICATIONS LTD http://www.m2.com
TELECOMWORLDWIRE-5 November 2007-LSI introduces PA2500 preamplifier integrated circuit(C)1994-2007 M2 COMMUNICATIONS LTD http://www.m2.com
The receiver uses an extended range detector log video amplifier (DLVA), a preamplifier and RF bandpass filtering.
It was hot on the heels of Ken Duke's review of the original AVA Omega III EC preamplifier (No.