Patent ID: 7689217
Filing Date: 2010-03-30
Classification: H03G

Abstract:
1. A radio receiver having a priority scanning mode of operation for listening on a first channel and scanning at least one priority channel to detect activity comprising: an amplifier having an automatic gain control (AGC) operating in open loop and closed loop operational modes for controlling the gain of a receiver analog signal; an analog-to-digital converter (ADC) for converting the receiving analog signal to a digital signal; a digital signal processor (DSP) for processing the digital signal; a host processor for controlling the DSP; an AGC system having a signal magnitude estimator for providing a signal strength estimate of the received signal to an AGC controller; and wherein the AGC controller operates the receiver amplifier in an open-loop AGC operational mode and sets a first AGC threshold for providing an interrupt service request (ISR) to the DSP if a received signal is detected above the first threshold during a priority scan of the priority channel.