Patent ID: 8831076

Claim:
A transceiver in-phase and quadrature (IQ) calibration method, the transceiver comprising a transmitter and a receiver, the transmitter transmitting a first radio-frequency (RF) signal according to a first in-phase (I) signal and a first quadrature (Q) signal, the receiver receiving a second RF signal and generating a second I signal and a second Q signal; the method comprising: a) adjusting the first I signal, the first Q signal and a phase delay to obtain a first amplitude variable associated with the transmitter and a second amplitude variable associated with the receiver, wherein the phase delay is associated with a phase difference between the first RF signal and the second RF signal; b) tuning the transceiver according to the first amplitude variable and the second amplitude variable such that the first I signal and the first Q signal as well as the second I signal and the second Q signal are matched in amplitude; c) adjusting the first I signal, the first Q signal and the phase delay to obtain a first phase variable associated with the transmitter and a second phase variable associated with the receiver; and d) tuning the receiver according to the first phase variable and the second phase variable such that the first I signal and the first Q signal as well as the second I signal and the second Q signal are matched in phase, wherein step (a) comprises: a1) adjusting the first Q signal to zero; a2) adjusting the phase delay until when the second I signal has a minimum amplitude to set an amplitude of the second Q signal as a first Q amplitude value; a3) adjusting the phase delay until when the second Q signal has a minimum amplitude to set an amplitude of the second I signal as a first I amplitude value; wherein, the first Q amplitude value and the first I amplitude value relate to the first amplitude variable and the second amplitude variable.