Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1980-01-17

1981-12-22

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330138, 330279, H03G 320

Patent

active

043073484

ABSTRACT:
An A.G.C. circuit is disclosed having two modulators connected in series to modulate an input signal and an amplifier for amplifying the output of the second modulator and applying it to an output terminal. A detector detects the output of the amplifier and an integrator compares the detected level with a reference so as to produce a control signal dependent on the error. The control signal is applied to the first modulator through an impedance path having an impedance which decreases with increasing frequency, and is applied to the same modulator through an impedance path having an impedance which increases with increasing frequency. In this way, the first modulator performs modulation primarily dependent on the A.C. component of the control signal and a second modulator performs modulation primarily dependent on its D.C. components of the control signal. Therefore, changes in the gain of the amplifier, or in the level of the input signal, which tend to alter the upper limit of the loop bandwidth of the circuit, are substantially offset by the effect of the resultant change in the gain of the second modulator.

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