Patent ID: 8711905

Claim:
A method, comprising: generating a first phase-shifted signal in a loopback path from an analog section of a transmitter of a direct conversion transceiver to an analog section of a receiver of the direct conversion transceiver via a wideband signal of the transmitter of the direct conversion transceiver; generating a second phase-shifted signal in the loopback path from the analog section of the transmitter to the analog section of the receiver via the wideband signal, wherein the phase angles of the first and second phase-shifted signals differ, wherein the generating the first and second phase-shifted signals comprises switching a poly-phase filter to a first state to generate the first phase-shifted signal and switching the poly-phase filter to a second state to generate the second phase-shifted signal; measuring in-phase and quadrature signals for the transmitter and the receiver for the first phase-shifted signal and in-phase and quadrature signals for the second phase-shifted signal to store a first set of parameters based upon the measuring; calculating, via at least one Fourier transform calculation, a second set of parameters from the first set of parameters; and calculating correction parameters for quadrature imbalance to adjust an element in the analog section of the transmitter, the receiver, or a combination thereof responsive to the correction parameters by calculating phase imbalance and gain imbalance factors for the transmitter and calculating phase imbalance and gain imbalance factors for the receiver based upon the second set of parameters.