Patent ID: 7302245

Claim:
An automatic gain amplifier circuit comprising: (a) at least one gain-adjustable amplifier for receiving an analog signal, amplifying or attenuating the analog signal, and outputting a gain-adjusted signal; (b) at least one analog-to-digital converter for converting the gain-adjusted signal into a digital signal; (c) a power estimator for estimating the total power of the digital signal; (d) a comparator for comparing the estimated digital signal total power with a power reference value to generate an error signal; (e) an accumulator for accumulating the error signal and outputting a gain control signal which is used to control the gain of the at least one gain-adjustable amplifier; and (f) an initial value generator for calculating an initial control word and outputting the initial control word to the accumulator, the control word indicating a current time slot and a current frame.