Patent ID: 8060049

Claim:
An integrated AM/FM broadcast receiver having an AM mode of operation and an FM mode of operation, comprising: mixing circuitry configured to receive AM broadcast input signals and AM mixing signals in an AM mode of operation and configured to receive FM broadcast input signals and FM mixing signals in an FM mode of operation, the mixing circuitry being further configured to output real path (I) and imaginary path (Q) AM signals in the AM mode of operation and to output real path (I) and imaginary path (Q) FM signals in and FM mode of operation; local oscillator (LO) generation circuitry configured to receive an AM channel selection signal and to output the AM mixing signals to the mixing circuitry in the AM mode of operation and configured to receive an FM channel selection signal and to output the FM mixing signals to the mixing circuitry in the FM mode of operation, the AM mixing signals and the FM mixing signals being configured so that the I and Q signals from the mixing circuitry in both the AM and FM modes of operation are at a non-zero intermediate frequency (IF) equal to or below about 600 kHz; analog-to-digital conversion (ADC) circuitry coupled to receive the I and Q signals from the mixing circuitry in both the AM and FM modes of operation and configured to output real path (I) and imaginary path (Q) digital signals; digital-signal-processor (DSP) circuitry coupled to receive the digital I and Q signals from the ADC circuitry and configured to output digital audio signals, the digital audio signals representing audio content within an AM broadcast channel in the AM mode of operation and representing audio content within an FM broadcast channel in the FM mode of operation; digital-to-analog conversion (DAC) circuitry configured to receive the digital audio signals and to provide analog audio output signals; and a digital interface configured to receive the digital audio signals and to provide digital audio output signals; wherein the mixing circuitry, the LO generation circuitry; the ADC circuitry, the DSP circuitry, the DAC circuitry and the digital interface are integrated within a single integrated circuit; wherein the integrated circuit is made using a process that comprises a CMOS process; and wherein the ADC circuitry and the DSP circuitry are configured to be used in both the AM mode of operation and the FM mode of operation.