Patent ID: 8145153

Claim:
A method for calibrating an analog I/Q-modulator of a transmitter, comprising the steps of: adjusting a calibration signal with a first predetermined compensation value; correlating a first harmonic of the calibration signal with a first detector circuit output to result in a first complex compensation measurement result; adjusting the calibration signal with a second predetermined compensation value; correlating a second harmonic of the calibration signal with a second detector circuit output to result in a second complex compensation measurement result; generating an optimum compensation value by using the first and second predetermined compensation values and the first and second complex compensation measurement results; adding a positive offset to the first predetermined compensation value; subtracting a negative offset from the second predetermined compensation value; generating a first complex coarse compensation measurement result or a first complex fine compensation measurement result over a predetermined period for averaging; and generating a first optimum coarse compensation value or a first optimum fine compensation value.