automatic gain control


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automatic gain control

[¦ȯd·ə¦mad·ik ′gān kən‚trōl]
(electronics)
A control circuit that automatically changes the gain (amplification) of a receiver or other piece of equipment so that the desired output signal remains essentially constant despite variations in input signal strength. Abbreviated AGC.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
A large number of images have been studied in Matlab to develop an algorithm for automatic gain control. Not all images need amplification.
Other applications include power control for repeaters and in other RF equipment when automatic gain control loops are implemented.
The AGC Circuitry--The automatic gain control circuit boosts low-level signals and attenuates (slightly diminishes) high-level signals.
The VGA is directly controlled by the AD6649 which can use the 1-dB gain step resolution in a simplified AGC (automatic gain control) loop.
Practitioner Bullock has thoroughly updated this edition to cover transceiver design, the transmitter, (including basic functions, digital modulation, and direct sequence spread spectrum), receivers (dynamic range and minimum detectable signals, mixers, and group delays), the differences between automatic gain control design and the phase-locked loop, demodulation (types, carrier recovery and phase-shift detection), basic probability and pulse theory, and multipath (including the power summation approach).
They also include automatic light control, automatic gain control, automatic tracing white balance, backlight compensation, and aperture selection.
The constant current source with automatic gain control feedback can be derived using the internal D/A converter and a simple algorithm running in the MCU.
The phone features a hands-free speakerphone, automatic gain control, acoustic echo cancellation and a built-in 6" TFT-LCD display.
Additionally it has automatic gain control, a source current indicator, continuous distance/depth and an adjustable backlit display.
The analog continuous bias also provides a continuous gain reduction of approximately 10 dB at low power, which improves the dynamic range of the automatic gain control in the transmit chain.
Automatic gain control (AGC) logic promises stable, high-speed performance with excellent reading depth and angle characteristics even with varying colors and low-contrast bar codes.
The signal strength of NBIF signals is a function of the received signal strength -- but that relationship may not be linear, since the IF amplifier may have a logarithmic response or may include automatic gain control (AGC).

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