AGC circuit

Details AGC circuit AGC circuit

2005-03-01

2005-03-01

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Receivers

Automatic gain control

C455S234100, C455S245100, C330S278000, C342S092000

Reexamination Certificate

active

06862327

ABSTRACT:
An automatic gain control (AGC) circuit includes a digitally-controlled amplifier having a gain control loop including a level detector, a threshold circuit and a digital gain control signal generator coupled to a gain control input of the digitally-controlled amplifier for supplying thereto a digital gain control signal. To prevent astable gain settings of the digitally-controlled amplifier from occurring, a continuously-controlled amplifier is coupled between an output of the digitally-controlled amplifier and the level detector, an output of the level detector being coupled to a gain control input of the continuously-controlled amplifier for supplying thereto a continuous gain control signal, the gain variation range of the continuously-controlled amplifier at least corresponding to the gain step variation of the digitally-controlled amplifier at an incremental step of the digital gain control signal.

REFERENCES:
patent: 4774474 (1988-09-01), Beauducel et al.
patent: 4806914 (1989-02-01), Thomas et al.
patent: 5036527 (1991-07-01), Halim et al.
patent: 5086437 (1992-02-01), Tomita
patent: 6018554 (2000-01-01), Glover
patent: 6072997 (2000-06-01), Kawai
patent: 6408168 (2002-06-01), Sessink

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