Automatic gain control circuit

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

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Details

4552411, 4552441, 375345, H04B 106

Patent

active

060885831

ABSTRACT:
In an automatic gain control (AGC) circuit for controlling a preceding gain control unit and a following gain control unit, the AGC circuit according to the present invention includes at least a comparison unit, a first gain control signal output unit and a second gain control signal output unit. The comparison unit compares a signal level from the following gain control unit with a reference value. The first gain control signal output unit outputs a first gain control signal to the following gain control unit in response to an output signal obtained as a result of comparison in the comparison unit. The second gain control signal output unit outputs a second gain control signal to the preceding gain control unit. Further, the second gain control signal has a time constant longer than that of the first gain control signal output unit, in response to the output signal obtained as the result of comparison in the comparison unit.

REFERENCES:
patent: 5564092 (1996-10-01), Grandfield
patent: 5697081 (1997-12-01), Lyale, Jr.

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