Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1981-12-17

1984-01-03

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330285, 330281, H03G 310

Patent

active

044244940

ABSTRACT:
An automatic gain control circuit is disclosed which is direct coupled to phase opposed outputs of an IF amplifier and provides a DC control voltage for controlling the gain of the amplifier. The AGC circuit includes a peak-to-peak threshold detector and an integrating capacitor. The quiescent voltage across the capacitor is accurately established by a voltage divider network and a feedback network. Separate current sources are provided to establish dual time constants in the circuit so that distortion is minimized while accommodating a stop on station feature.

REFERENCES:
patent: 4001694 (1977-01-01), Grundy et al.

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