Patent ID: 8374294
Filing Date: 2013-02-12
Classification: H03G

Abstract:
1. An apparatus for amplifying an input signal and outputting an output signal, comprising: a variable-gain circuit to amplify the input signal and to output the output signal according to a gain of the variable-gain circuit, wherein the gain of the variable-gain circuit is adjusted according to an adjustment signal; a gain adjustment circuit, coupled to the variable-gain circuit, to generate the adjustment signal according to the output signal and a target value; and a target value adjustment circuit, coupled to the gain adjustment circuit, to monitor a strength of the output signal to generate a control signal, and generate the target value according to the control signal, wherein the target value adjustment circuit further comprises a selector configured to select a current target value as a new target value if a saturation probability of the input signal lies within an allowable range, wherein the selector is configured to select a sum of the current target value and a unit value as the new target value if the saturation probability is less than the allowable range.