Patent ID: 7254379

Claim:
A calibration system for an RF system that includes an rf receiver capable of operating in a normal mode and in a calibration mode, comprising: one or more phase/amplitude mismatch calibrating elements integrated with at least one RF receiver component selected from the group composed of a local oscillation buffering circuit, a divide-by-two circuit, and a down conversion mixer; a calibrated phase delay unit provided on at least one of an I channel output and a Q channel output of the RF receiver; a phase detector configured to detect a phase difference between the I channel output of the RF receiver and the Q channel output of the RF receiver with the calibrated phase delay; and a calibration control unit configured to provide a calibration control signal to the RF receiver based on the phase difference as provided by the phase detector; wherein the calibrated phase delay unit delays one or both of the I channel output and the Q channel output during a calibration mode to make I channel phase equal to Q channel phase.