Quad-Apollo MxFE reference design
28 February 2026
Design Automation
The Quad-Apollo MxFE reference design exemplifies a complete, high-performance platform for every-element direct-RF sampling digital beamforming using Analog Devices’ Apollo mixed-signal front-end technology. The reference board integrates four synchronised MxFE devices to implement a 16-transmit, 16-receive channel X-band subsystem, demonstrating a scalable and phase-coherent architecture suitable for advanced phased-array systems.
The design addresses the key system challenges associated with multi-chip RF converter deployments, including deterministic timing, precise clock distribution and multi-device synchronisation. By achieving phase-aligned sampling and transmission across all channels, the platform enables true digital beamforming, multi-beam operation and adaptive nulling across wide instantaneous bandwidths. Uniform element spacing, optimised for half-wavelength operation at approximately 12 GHz, supports accurate spatial sampling and repeatable beam patterns.
The reference board integrates all major signal-chain functions required for system-level evaluation, including RF front-end conditioning, low-noise amplification, broadband filtering with bypass options, multichip clocking, triggering and comprehensive power management. Overall, the Quad-Apollo MxFE reference design serves as a practical blueprint for building high-channel-count RF systems in applications such as phased-array radar, electronic warfare and advanced communications.
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