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Schematic of an AGC used in the analog telephone network; the feedback from output level to gain is effected via a Vactrol resistive opto-isolator.. Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input.
That arrangement provided similar performance, in a four-tube radio, as one with five tubes. Often, but not always, such reflex receivers did not have Automatic Gain Control (AGC), and it was usually not possible to reduce the volume completely to zero, even at the minimum volume setting. [9]
To match the performance of the superheterodyne receiver, a number of the functions normally addressed by the IF stage must be accomplished at baseband.Since there is no high gain IF amplifier utilizing automatic gain control (AGC), the baseband output level may vary over a very wide range dependent on the received signal strength.
[104] [106] Convenience features like large lighted dials, tone controls, pushbutton tuning, tuning indicators and automatic gain control (AGC) were added. [103] [105] The receiver market was divided into the above broadcast receivers and communications receivers, which were used for two-way radio communications such as shortwave radio. [107]
Obvious applications would be for electronic volume control and automatic gain control (AGC). Although analog multipliers are often used for such applications, voltage-controlled amplifiers are not necessarily true analog multipliers.
Automatic gain control, intentional non-linearity and incidental non-linearity limit the output amplitude in various implementations of the oscillator. The circuit shown to the right depicts a once-common implementation of the oscillator, with automatic gain control using an incandescent lamp.
A key point about agc is that gain is changed without losing linearity. That someone writes something in a book does not make it so :) > Without AGC, an AM radio would have a linear relationship between the signal amplitude and the sound waveform – the sound amplitude, which correlates with loudness, is proportional to the radio signal amplitude,
In an electric power system, automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary.