Patent ID: 8340227

Claim:
An apparatus, comprising: a digital demodulator including an automatic gain control (AGC) circuit with a self-adapting target value to provide optimum performance under all signal conditions; and an ACI ratio circuit to provide the AGC with an ACI ratio representing a measurement of adjacent channel interference (ACI) in an input signal; wherein the target value is automatically adjusted if the ACI ratio exceeds a predetermined value; wherein the ACI ratio is based on an equation: ACI_Ratio = ( AGC_ ⁢ 2 ⁢ _Gain * TG_ ⁢ 1 TG_ ⁢ 2 ) 2 - 1 where ACI Ratio is a measure of the amount of ACI in system, AGC 2 Gain is the gain applied by a second automatic gain controller, TG 1 is a first target value, and TG 2 is a second target value as generated by the second automatic gain controller.