Patent ID: 7477881

Claim:
An intermediate frequency receiver, comprising: mixers for generating first and second IF (intermediate frequency) signals from a RF (radio frequency) signal and local oscillator signals; a magnitude calibration loop for adjusting a respective gain for each of at least one of the first and second IF signals generated after transmission from the mixers, depending on a difference between magnitudes of the first and second IF signals; and a phase calibration loop for adjusting a respective phase of each of at least one of the local oscillator signals generated before transmission through the mixers, depending on a phase difference between the first and second IF signals; wherein the phase calibration loop includes: a limiter for limiting a DC offset of the IF signals that are amplified; a phase detector for determining the phase difference between the IF signals that are amplified; and a charge pump for generating a control voltage depending on the phase difference between the IF signals that are amplified.