Patent ID: 8120531

Claim:
A signal processing apparatus for a multi-mode satellite positioning system, for receiving a radio frequency (RF) signal to generate a baseband signal corresponding to an operation mode, the signal processing apparatus comprising: a band-pass filter, for filtering the RF signal to generate a filtered RF signal; a local oscillating circuit, for generating a first oscillation signal and a second oscillation signal according to the operation mode; a first mixing circuit, for mixing the first oscillation signal and the filtered RF signal to generate a first mixed signal, and processing the first mixed signal to generate a first intermediate frequency (IF) signal according to the operation mode; a second mixing circuit, for mixing the second oscillation signal and the first IF signal to generate a second mixed signal, and filtering out image rejection components from the second mixed signal to generate a second IF signal; an analog-to-digital converter (ADC), for converting the second IF signal to a digital signal; and a baseband circuit, comprising a plurality of baseband processors, coupled to the ADC for receiving the digital data and activating one of the baseband processors to generate the baseband signal by decoding the digital signal according to the operation mode.