Patent ID: 7548734

Claim:
A method for receiving a received signal and thereby outputting an output signal, comprising: receiving a first signal of the received signal corresponding to a first frequency by a first receiving circuit; receiving a second signal of the received signal corresponding to a second frequency by a second receiving circuit; adjusting a load of a loading circuit according to a band control signal; and determining the transfer of the first signal or the second signal to the loading circuit according to the band control signal and thereby outputting the output signal; adjusting an impedance according to the band control signal to remove a common-mode noise of the output signal; and mixing the output signal and an oscillating signal and thereby outputting a mixed signal; wherein the loading circuit is a tunable LC tank comprising: an inductor; a capacitor being coupled in series with the inductor; and a tunable inductor being coupled in parallel with the inductor and the capacitor.