Signal Amplifier

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Signal Amplifier


a device used to increase the power of electric signals. Since the amplified signals are variations in time, or oscillations, of voltage or current, a signal amplifier is, essentially, an amplifier of electric oscillations.

Signal amplifiers may be divided into such classes as low-or high-frequency amplifiers, video amplifiers, and DC amplifiers. Signal amplifiers also include instrument amplifiers, which are used as components of such measurement apparatus as electronic voltmeters, oscilloscopes, potentiometers, and instruments that use bridges. An instrument amplifier makes possible increased sensitivity and accuracy in the measurement of both electrical and nonelectrical quantities. The primary requirement of such an amplifier—that it provide a fixed gain—is satisfied owing to its large amount of negative feedback. Moreover, in a number of instruments, such as voltmeters and oscilloscopes, the amplifier must ensure normal operation of the instrument over a wide frequency range that sometimes extends from zero to several gigahertz.


References in periodicals archive ?
Proposed solution shall be unlicensed spread spectrum radio, and include any signal amplifiers
For networks up to 450km, Nortel has teamed with MPB Communications to enable carriers to upgrade their networks to 40G speeds without the need to deploy costly optical signal amplifiers - also called repeaters - along the sea floor.
However, without careful system level design between the AFE and the controller, the actual drive level implementation may require more than 100 discrete passive and active components, such as DACs, resistors, capacitors, inductors and active filters, signal amplifiers, and comparator circuits to effectively couple an AFE and controller chip.
Manufacturers today build heterostructures into many electronic devices vital to modern communications, including the low-noise, high-frequency signal amplifiers common in satellites and mobile telephones.
7 million order to provide high power/small signal amplifiers for use in electronic warfare systems.
Standard and Configurable RF/Microwave Products: A broad line of active and passive components for commercial, military, medical, and industrial applications featuring synthesizers, small signal amplifiers, power amplifiers, antennas, switches, power dividers, couplers, and rotary joints.
CTA018 is a member of a new class of vitamin D analogues with a dual mechanism of action, called Vitamin D Signal Amplifiers.
Genisphere's 3DNA([R]) signal amplifiers will enable the commercialization of new LF assays that otherwise could not be launched due to unacceptably low sensitivity and will help test-makers differentiate themselves in the competitive POC testing market, which is flooded with products that are limited by both sensitivity and quantitative accuracy.
This announcement was came as a reaction to an inquiry by Swiss Federal Railways (SBB) and the mobile operators Swisscom, Orange and Sunrise to enhance the mobile infrastructure, made at the beginning of September According to these provisions, 1,700 carriages are due to be supplied with signal amplifiers and a large number of additional antennas to be installed along the tracks until 2020.
To make use of these small signals, however, they must be amplified using sensor signal amplifiers, which are positioned downstream of the sensor and require sensitive analog technology to ensure high-accuracy amplification.