Patent ID: 7881692

Claim:
An integrated terrestrial audio broadcast FM receiver, comprising: mixer circuitry coupled to receive an RF signal spectrum and phase shifted mixing signals as inputs and having a low-IF signal as an output, the RF input signal spectrum comprising an FM audio broadcast signal spectrum comprising a plurality of FM channels from terrestrial audio FM broadcasts, the mixer circuitry being configured to output real and imaginary low-IF signals; local oscillator (LO) generation circuitry coupled to receive a channel selection signal as an input and configured to provide an oscillation signal, the oscillation signal being dependent upon the channel selection signal and being used to generate the phase shifted mixing signals for the mixer circuitry; low-IF conversion circuitry coupled to receive the real and imaginary low-IF signals from the mixer circuitry and configured to output digital signals, the low-IF conversion circuitry including first and second analog-to-digital converters coupled to the real and imaginary low-IF signals and configured to output real and imaginary digital signals; and digital-signal-processor (DSP) circuitry coupled to receive the digital signals from the low-IF conversion circuitry and configured to demodulate the frequency modulation within a selected FM channel, to decode the FM stereo encoding within the selected FM channel, to digitally tune the selected FM channel, and to output digital audio signals, the DSP circuitry comprising an on-chip microcontroller; and digital-to-analog converter (DAC) circuitry coupled to receive the digital audio signals from the DSP circuitry and configured to output analog audio signals; wherein the mixer circuitry, the LO generation circuitry, the low-IF conversion circuitry, and the DSP circuitry including the microcontroller are integrated within a single integrated circuit; and wherein the integrated circuit is made using a CMOS process.