Automatic level control circuit

Details Automatic level control circuit Automatic level control circuit

1975-04-21

1976-07-13

Mullins, James B.

Amplifiers

Variable impedance for signal channel controlled by separate...

330124R, 330129, H03G 320

Patent

active

039696839

ABSTRACT:
An automatic level control circuit utilizes digital techniques in the gain control loop to maintain an output signal within a predetermined amplitude range. A comparator circuit, which has preselected limits or threshold levels that establish the predetermined amplitude range, produces a hysteresis property in its operation. The hysteresis provides a substantial improvement in noise immunity over conventional automatic gain control circuits. The output of the comparator is applied to digital circuitry which controls the variable gain of a linear amplifier. The digital circuitry also includes a preset circuit which sets the gain of the variable amplifier to the middle of its range, thereby reducing the average time required for an input signal to produce an output signal within the predetermined range. In addition, a decoder indicates the level of the input signal and an out-of-range circuit indicates the relative magnitude of an input signal when it is not within the input range capability of the automatic level control circuit.

REFERENCES:
patent: 3308392 (1967-03-01), McCarter
patent: 3464022 (1969-08-01), Locheed et al.
patent: 3684968 (1972-08-01), Carroll
patent: 3879672 (1975-04-01), Milanes

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