Patent ID: 7831215

Claim:
A method for controlling a transceiver circuit comprising a first up-conversion IQ mixer, a second up-conversion IQ mixer, a first down-conversion IQ mixer, a second down-conversion IQ mixer, a first local oscillator and a second oscillator, the method comprising: (a) measuring a Tx carrier leakage using a signal obtained by passing a Tx carrier leakage included in an output of the first up-conversion IQ mixer through the second down-conversion IQ mixer; (b) measuring a Tx IQ mismatch using a signal being passed through the first up-conversion IQ mixer and the second down-conversion IQ mixer; (c) measuring a Rx IQ mismatch using a signal being passed through the second up-conversion IQ mixer and the first down-conversion IQ mixer; and (d) carrying out transmission/reception using the first up-conversion IQ mixer and the first down-conversion IQ mixer during an operation period, wherein the first local oscillator generates a first IQ LO signal used in the first up-conversion IQ mixer and the first down-conversion IQ mixer, and the second oscillator generates a second IQ LO signal used in the second up-conversion IQ mixer and the second down-conversion IQ mixer.