I/Q APPARATUS AND METHOD FOR CALIBRATING I/Q IMBALANCE OF DIRECT-CONVERSION TRANSMITTER

摘要

The present invention measures a reference RSB which is an RSB of a signal output from the direct conversion transmitter with respect to an in-phase signal (I _D ) and a quadrature phase signal (Q _D ) of a digital baseband input to the direct conversion transmitter. Gain of the direct conversion transmitter through a method of measuring an additional RSB which is an RSB of a signal output from the direct conversion transmitter according to a gain mismatch parameter g _a or a phase mismatch parameter θ _a input to a baseband. error parameter (g _err) and the phase error, and determines the parameters (θ _err), configured to take advantage of the gain error parameter (g _err) and the phase error parameter (θ _err) in the I / Q imbalance compensation in the direct conversion transmitter being The advantage is that simple, accurate compensation is possible.