| 摘要 |
The present invention provides a GPS receiver comprising sampling circuitry adapted to perform IF-to-baseband conversion. In general, the GPS receiver includes downconversion circuitry that uses a first synthesizer output signal to reduce an amplified GPS input signal to an intermediate frequency signal, and sampling circuitry that receives the intermediate frequency signal and produces a baseband digital representation of the amplified GPS input signal. The sampling circuitry performs IF-to-baseband conversion by using a sampling rate equal to the frequency of a second synthesizer output signal, where the sampling rate is selected such that only an alias of the IF signal having the appropriate baseband frequency is digitized.
|
