Patent ID: 9059671
Filing Date: 2015-06-16
Classification: H03G

Abstract:
1. An automatic gain control device which amplifies a received signal with a gain corresponding to a signal level, the automatic gain control device comprising: an A/D converter configured to convert the amplified signal as an analog signal into a digital signal; an average power detection unit configured to receive the digital signal from the A/D converter and detect an average power of the received signal in a specific period; an instantaneous power to average power ratio calculation circuit configured to receive the digital signal from the A/D converter and the average power from the average power detection unit and calculate an instantaneous power to average power ratio; a threshold calculation unit configured to calculate a threshold based on a plurality of instantaneous power to average power ratios inputted in a certain period; a gain control unit configured to compare the average power to the calculated threshold and determine a gain based on the comparison result; and a variable gain amplifier configured to amplify the received signal inputted by using the determined gain.