Decorrelation and mitigation of spurious products in phased arrays with direct conversion transceivers

The decorrelation of spurious products among the elements in a phased array of direct conversion digital receivers is discussed. Intentional phase randomization of each local oscillator and post-distortion prior to digital beamforming are presented as methods of suppression. Results are shown using a representative system, further validating and extending the theoretical results beyond previous lab-bench superheterodyne results. Further limits to dynamic range in such a system are discussed.