Patent ID: 7577414
Filing Date: 2009-08-18
Classification: H03G,H04B

Abstract:
1. An automatic gain control (AGC) for applying a variable gain to a broadband signal, the AGC comprising: a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broadband signal based on a value of a gain signal to provide an amplified broadband signal; and a controller to provide the gain signal to the variable gain amplifier, the controller adapted to determine the value of the gain signal based on at least one power characteristic of the amplified broadband signal, wherein the controller includes at least one first power detector adapted to detect a first power characteristic to generate at least one sensed value and at least one second power detector adapted to detect a second power characteristic having peak values of the broadband signal, wherein the controller includes a default reference that is adjusted based at least on a first number of peak values of the broadband signal exceeding a first threshold during a predetermined time interval to determine the at least one reference value, and wherein the controller includes a comparator configured to provide an error signal indicative of a difference between the at least one sensed value and at the least one reference value.