Dynamic automatic gain control circuit employing kalman filtering

摘要

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 that enables the AGC circuit to quickly adapt to changes in the signal level of the input. An AGC circuit incorporating a hysteresis in the feedback loop is also disclosed.