Importance

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Abstract

An automatic gain control circuit is disclosed. The automatic gain control circuit receives a radio frequency signal at an input. The input passes the radio frequency signal to a first gain loop having a changeable gain. A low pass filter filters the radio frequency signal. In a second gain loop, the gain of the filtered signal is adjusted. The automatic gain control circuit includes at least one signal detector for detecting a signal level in the first gain loop and a signal level in the second gain loop. The automatic gain control circuit also includes an adjustment module for adjusting the gain of the first and second gain loops based upon the detected signal levels wherein overall gain of the first and the second gain loops is increased no greater than a predetermined value.

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First Claim