Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

Filed on

1979-04-10

Date issued

1981-04-07

Examiner

Mullins, James B.

Patent Class

Amplifiers

SubClass

With semiconductor amplifying device

SubSubClass

Including gain control means

Other Related Categories

330284, H03G 330

Type

Patent

Status

active

Patent number

042609534

Description

ABSTRACT:
The invention relates to an automatic gain control circuit for restoring an input signal whose variable level is to be regulated throughout the whole frequency band, in particular to restore the input signal to a constant level. A gain control loop uses n phase shifters (3,4) each phase shifting at the lower limit of the frequency band of the input signal by 2.pi./(n+1), being connected in cascade to the output of the circuit and followed by a rectifier and summing circuit (5) acting on the output signals of the circuit (S) and of each of the phase shifters (3 and 4) to generate a single polarity signal which, filtered by a cell (7) with a short time constant, constitutes the gain control signal. The circuit can be used in a modulator-demodulator to transmit data, in particular facsimile signals, over a telephone line.

REFERENCES:
patent: 2803711 (1957-08-01), Wiggin et al.
patent: 3676792 (1972-07-01), Newton
patent: 3760255 (1973-09-01), Grodinsky
patent: 3895310 (1975-07-01), Warren

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