Patent ID: 7643545

Claim:
A method of calibrating automatic test equipment (ATE) comprising transmission paths that transport signals, the method comprising: obtaining amplitude gains of the signals across the transmission paths; obtaining phase delays of the signals across the transmission paths; obtaining magnitude and phase offsets associated with the signals based on the amplitude gains and the phase delays; and calibrating the ATE using the magnitude and phase offsets; wherein the transmission paths comprise an inphase (I) transmission path and a quadrature (Q) transmission path; and wherein the amplitude gains comprise a Gain_II gain across the I transmission path, a Gain_QQ gain across the Q transmission path, and gains across connections of the I and Q transmission paths wherein the gains across the connections of the I and Q transmission paths comprises a Gain_IQ gain from the I transmission path to the Q transmission path, and a Gain_QI gain from the Q transmission path to the I transmission path.