In this work, we propose an analysis, characterization, and correction of transmit-receive cross-modulation (CM) distortion in a full duplex quadrature balanced CMOS RF front-end around the carrier frequency of 5.2 GHz. A theoretical model of the CM mechanism stemming from instantaneous variations in the power amplifiers’ output impedance is laid out and verified in measurement. A two-dimensional digital post-distortion (2D-DPoD) algorithm is employed to linearize the CM distorted receive signal, in conjunction with wideband digital RF and baseband self-interference cancellation.

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