Patent ID: 8565358

Claim:
A method for managing automatic gain control in quadrature signal paths of a radio-frequency subsystem of a wireless communication system, the method comprising: determining a first signal strength at an input to a channel select filter in a digital receiver path and a second signal strength at an output of the channel select filter; comparing the first and second signal strengths to detect whether a blocker is present in the quadrature signal paths of a receiver of the radio-frequency subsystem; in response to detecting the blocker, forwarding a blocker presence signal to an analog control branch of an automatic gain control circuit, the automatic gain control circuit including a loop filter coupled to the analog control branch and a digital control branch, the digital control branch generating a digital control word configured to adjust a scaler coupled to the channel select filter; and in response to not detecting the blocker, determining a difference between the second signal strength at the output of the channel select filter and a reference signal power, and applying the difference between the second signal strength and the reference signal power to the automatic gain control circuit.