Patent ID: 8457573
Filing Date: 2013-06-04
Classification: H03G

Abstract:
1. An automatic gain control circuit, comprising: a controller for adjusting intermediate frequency gain and radio frequency gain; a baseband demodulator, wherein said baseband demodulator receives information from said controller regarding status of said controller and further wherein said controller receives correlation information from said baseband demodulator; and an analog-to-digital converter for receiving a received signal strength indicator, wherein a start of a signal is indicated by a large increase in the received signal strength indicator, wherein said controller suspends processing for a first pre-determined time period after detecting the start of the signal, wherein said controller determines if said radio frequency gain should be reduced based upon feedback from said baseband demodulator and said received signal strength indicator, wherein said radio frequency gain is reduced after said first pre-determined time period, if it is determined that said radio frequency gain should be reduced, wherein said controller further suspends processing for a second pre-determined period of time after said radio frequency gain has been reduced, wherein said intermediate frequency gain is reduced after said second pre-determined time period after said radio frequency has been reduced, wherein a determination is made if there is enough time before data is received to make an additional gain adjustment to said radio frequency and to said intermediate frequency.