Patent ID: 7187915

Claim:
An Automatic Gain Control (AGC) method, comprising: setting a gain of a Low Noise Amplifier (LNA) and a gain of a Variable Gain Amplifier (VGA) according to preset upper boundaries LNA 0 and VGA 0 respectively; detecting and comparing the power of a signal to a first power level until it exceeds the first power level, wherein the first power level exceeds an average noise power; tuning the gains of the LNA and the VGA according to maximum preset values LNA 1 and VGA 1 ; computing a second power level depending on an average power of the signal; comparing the second power level to a first threshold, and moving to execute fine tune procedures if the second power level is less than or equal to the first threshold; tuning the gain of the LNA and the VGA according to medium preset values LNA 2 and VGA 2 if the second power level exceeds the first threshold; recalculating the second power level and comparing it to the first threshold, if the recalculated second power level is less than or equal to the first threshold, moving to execute fine tune procedures; tuning the gain of the LNA and the VGA according to minimum preset values LNA 3 and VGA 3 if the recalculated second power level exceeds the first threshold; beginning fine tune procedures by computing a third power level depending on an average power of the signal; and tuning the gain of the VGA according to a difference between the third power level and a second threshold.