Automatic gain control with three states of operation

Details Automatic gain control with three states of operation Automatic gain control with three states of operation

2007-04-17

2007-04-17

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C375S345000

Reexamination Certificate

active

11112041

ABSTRACT:
A method and apparatus for an automatic gain control (AGC) loop that utilizes freezing and unfreezing states. A freezing process moves the AGC into a TRANSITION state from a NORMAL state, based on net change of VGA gain control codes over a monitoring time window. The freezing process then moves the AGC into a FROZEN state from the TRANSITION state, based on net change of VGA gain control codes over the monitoring time window. An unfreezing process moves the AGC into the NORMAL state from the FROZEN state, based on signal amplitude changes at the output of the VGA.

REFERENCES:
patent: 4514703 (1985-04-01), Maher et al.
patent: 6577852 (2003-06-01), Iwata et al.
patent: 6621345 (2003-09-01), Matsugatani et al.
patent: 6927632 (2005-08-01), Sjursen et al.
patent: 2004/0110525 (2004-06-01), Black et al.

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