Patent ID: 7477918

Claim:
A radio-frequency (RF) receiver comprising: a first low noise amplifier (LNA) amplifying a first RF signal; a local oscillating module generating first, second and third local oscillating signals, wherein the first local oscillating signal is generated according to the second local oscillating signal and the third local oscillating signal, and the second and third local oscillating signals have a phase difference of about 90 degree; a first mixer mixing the first RF signal with the first local oscillating signal to generate an intermediate frequency signal; a second LNA amplifying a second RF signal; and a second mixer and a third mixer coupled to the first mixer and operated in two modes, the second and third mixer respectively mix the intermediate frequency signal to generate a first and second baseband signals in a first mode, and the second and third mixer respectively mix the second RF signal with the second and third oscillating signals in a second mode.