Patent ID: 6843597
Filing Date: 2005-01-18
Classification: H03G,H04B,H04L

Abstract:
1. A fast two-loop automatic-gain-control (AGC) method for automatically varying a gain control signal for a receiver's variable amplifier, comprising the steps of: a) amplifying a received signal according to an adjustable gain value, wherein the adjustable gain value is based on a gain control signal; b) converting the amplified received signal from analog to digital c) calculating an indicator of the received signal's strength; d) generating an error signal based on the indicator and a predetermined reference power level; e) if a magnitude of the error signal bears a first relationship to a predetermined threshold value, then varying the gain control signal as a function of a fine-gain constant and the error signal; and f) if the magnitude of the error signal bears a second relationship to the predetermined threshold value, then varying the gain control signal as a function of a coarse-gain constant and the error signal; wherein the coarse-gain constant is larger than the fine-gain constant and the second relationship is complimentary to the first relationship.