Digital automatic gain control

Details Digital automatic gain control Digital automatic gain control

1999-06-14

2000-09-19

Vo, Don

Pulse or digital communications

Receivers

Automatic gain control

455219, 4552351, 4552421, 4552451, 4552471, H04L 2708

Patent

active

06122331&

ABSTRACT:
An automatic gain control, AGC, circuit comprising with a preferred transition region. A gain correction unit is responsive to an attenuate command and amplify command coming from a feedback system monitoring the AGC's output. The feedback system can individually adjust the delays of both attenuate and amplify commands sent to the gain correction unit. Additionally, the present AGC also includes a transition region detector that monitors the input signal applied to the AGC to from a feedforward system. The transition region detector producing a control output to selectively permit the gain correction unit to respond to an attenuate or amplify command. If the magnitude of the input signal is greater than a predetermined value, then it will place a disable signal on its control output to prevent the gain correction unit from altering its gain. However, if the magnitude of the input signal remains greater than the predetermined value for a long time, then a timer will override the transition region detector and enable the gain correction unit to adjust its gain.

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