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Automatic Gain Control (AGC) in Receivers

Automatic gain Control (AGC) in Receivers Iulian Rosu, YO3 DAC / VA3 IUL, Automatic gain Control (AGC) was implemented in first radios for the reason of fading propagation (defined as slow variations in the amplitude of the received signals) which required continuing adjustments in the receiver s gain in order to maintain a relative constant output signal. Such situation led to the design of circuits, which primary ideal function was to maintain a constant signal level at the output, regardless of the signal s variations at the input of the system. Now AGC circuits can be found in any device or system where wide amplitude variations in the output signal could lead to lose of information or to an unacceptable performance of the system.

Closed-Loop Control System • Any system that can respond to the changes and make corrections by itself is known as a closed-loop control system. • Automatic Gain Control (AGC) system is a closed-loop control system. • The main difference between open-loop and closed-loop systems is the feedback action.

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