Patent ID: 8112055

Claim:
A method comprising: adjusting a calibration code of a quadrature carrier (Q) branch of a receive chain to reduce a second-order intermodulation distortion (IMD2) component associated with the Q branch; holding a calibration code of an in-phase carrier (I) branch of the receive chain constant during said adjusting of the calibration code of the Q branch; adjusting the calibration code of the I branch to reduce an IMD2 component associated with the I branch; holding the calibration code of the Q branch constant during said adjusting of the calibration code of the I branch; generating, by a reference sensing chain coupled to a passive mixer that is coupled to the Q branch and the I branch, a first reference IMD2 signal corresponding to the I branch; and generating, by the reference sensing chain, a second reference IMD2 signal corresponding to the Q branch.