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Reducing Clock Spur Interference in Phased Array Subsystems
See how coordinated shielding and phase calibration can suppress clock-related interference, improve SFDR, and preserve multichannel RF performance.
Technical Article Overview
Clock spurs are quietly limiting your RF system's performance. In high-speed, mixed-signal designs, coherent clock leakage can couple into sensitive signal paths, degrading spectral purity, reducing SFDR, and putting JESD204 link stability at risk.
This technical article breaks down how ADI engineers tracked clock leakage from ADF4382 PLL ICs into the DAC outputs of the Quad-Apollo MxFE™ phased array subsystem, and solved it. Using a hybrid approach combining RF absorption materials, PLL phase rotation, and digital phase calibration, the team achieved over 45 dB of spur suppression, all without sacrificing output power, multichannel sync, or link stability.
Get the full breakdown of the hardware and calibration techniques behind this result, and see how the same methodology can be applied to your next high-speed RF or direct-sampling design.
