Patent ID: 7672364
Filing Date: 2010-03-02
Classification: H03J,H04B,H04L

Abstract:
1. A self-calibration method for use in a transceiver, comprising the steps of: generating an in-phase (I) channel test signal and a quadrature phase (Q) channel test signal in an analog baseband; converting the I and Q channel test signals generated in the analog baseband into radio frequency (RF) band signals and applying the RF band signals from a transmission stage to a reception stage through a test path; converting the applied RF band signals into analog baseband signals using a first carrier for the I channel and a first carrier for the Q channel applied as one pair and outputting a first I channel test signal and a first Q channel test signal; converting the applied RF band signals into analog baseband signals using a second cater for the I channel and a second carrier for the Q channel applied as one pair and outputting a second I channel test signal and a second Q channel test signal; calibrating a direct current (DC) offset for the I channel reception signal in the analog baseband of the reception stage using an average value of the first and second I channel test signals; and calibrating a DC offset for the Q channel reception signal in the analog baseband of the reception stage using the average value of the first and second Q channel test signals, wherein a phase difference between the first and second carriers for the I channel and the Q channel are 180 degrees, respectively.