Patent ID: 7689170

Claim:
A radio frequency (RF) receiver comprising: a noise removing unit that estimates a noise signal that is introduced into a received signal by controlling a gain and a phase of a local signal according to a phase signal and a gain signal, said noise removing unit removing the noise signal that is estimated, from the received signal; and a receiving unit that performs a frequency-down conversion of the received signal in which the noise signal that is estimated is removed using at least one of the local signal and a Q signal of the local signal, wherein the phase signal and the gain signal are generated from a phase value and an amplitude value of the received signal that is down-converted in the receiving unit respectively and fed back to the noise removing unit; and wherein the noise removing unit comprises: a phase correction circuit that generates a phase controlled local signal in which the phase of the local signal is controlled according to the phase signal; and an amplitude correction circuit that generates the estimated noise signal, which is a signal in which a gain of the phase controlled local signal is controlled, according to the gain signal and the phase controlled local signal, and the estimated noise signal is removed from the received signal by a current difference between the received signal and the noise signal that is estimated.