Dynamic automatic gain control circuit employing kalman filtering
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United States of America Patent
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Jul 20, 2004
Grant Date -
Dec 12, 2002
app pub date -
Apr 2, 2001
filing date -
Apr 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel and useful apparatus for and method of automatic gain control (AGC) using Kalman filtering and hysteresis. A nonlinear, time-variant loop filter such as a Kalman filter is employed in the feedback loop of an AGC circuit. The circuit is able to transition quickly and make fast adaptations to new levels of the input signal by use of a restart mechanism used to dynamically modify the gain of the loop filter thus enabling the AGC circuit to quickly adapt to changes in the signal level of the input. An AGC circuit incorporating a hysteresis circuit in the feedback loop is also disclosed.
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