Patent ID: 7782928

Claim:
A method for self-calibrating a transceiver, the method includes generating a pair of signals including a first in-phase channel test transmission signal and a first quadrature-phase channel test transmission signal in an analog baseband; converting the first in-phase channel test transmission signal and the first quadrature-phase channel test transmission signal of the analog baseband to a first in-phase channel test transmission signal and a first quadrature-phase channel test transmission signal of a Radio Frequency (RF) band, respectively, and applying the first in-phase channel test transmission signal and the first quadrature-phase channel test transmission signal of the RF band to a reception side through a test path for applying an RF band signal from a transmission side to the reception side; converting the first in-phase channel test transmission signal and the first quadrature-phase channel test transmission signal of the RF band to a first in-phase channel test reception signal and a first quadrature-phase channel test reception signal of the analog baseband; generating a pair of signals including a second in-phase channel test transmission signal and a second quadrature-phase channel test transmission signal in the analog baseband; converting the second in-phase channel test transmission signal and the second quadrature-phase channel test transmission signal of the analog baseband to a second in-phase channel test transmission signal and a second quadrature-phase channel test transmission signal of an RF band and applying the second in-phase channel test transmission signal and the second quadrature-phase channel test transmission signal of the RF band to the reception side through the test path; converting the second in-phase channel test transmission signal and the second quadrature-phase channel test transmission signal of the RF band to a second in-phase channel test reception signal and a second quadrature-phase channel test reception signal of the analog baseband; estimating and calibrating a direct current (DC) offset characteristic for an in-phase channel reception signal in the analog baseband of the reception side by using a mean value of the first in-phase channel test reception signal and the second in-phase channel test reception signal of the analog baseband; and estimating and calibrating a DC offset characteristic for a quadrature-phase channel reception signal in the analog baseband of the reception side by using a mean value of the first quadrature-phase channel test reception signal and the second quadrature-phase channel test reception signal of the analog baseband.