Datasheet 1.2r0: "LO Leakage" label

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Originally logged by @chemeris: The purpose of the "LO Leakage" label at the "Figure 1: Functional block diagram" is not to show the path of LO leakage. :) Actually it means "LO Leakage Cancellation" and refers to DACs used for that purpose. Refer to the "Calibration and Initialization" section of the datasheet.