Modern RF systems require extreme timing precision and phase coherence. Applications such as phased-array radar, 5G massive MIMO, radio astronomy and high-end instrumentation depend on multi-channel digitizers that sample in tight phase alignment. Any inter-channel timing or phase mismatch degrades beamforming, reduces array sensitivity and complicates calibration.
Synchronization is addressed at multiple scales:
- System-level (Multi-Board Synchronization): Aligns separate RFSoC devices across a network
- Device-level (Multi-Tile Synchronization): Aligns converter tiles within a single RFSoC device, ensuring deterministic latency and phase coherence across all ADCs and DACs.
This technical article gives you an overview of Multi-Tile Synchronization (MTS) in AMD’s Zynq™ UltraScale+™ RFSoC architecture and its validation on iWave’s ZU49DR SoM platform.
What is Multi-Tile Synchronization?
The AMD RFSoC integrates multiple ADC and DAC tiles, each containing several converter channels. While each tile can operate independently, their sampling instants are not inherently phase-aligned. Without synchronization, cross-tile sampling introduces random offsets in both phase and sample timing. MTS resolves this by employing: – A common reference clock distributed across tiles. – A SYSREF signal, which establishes deterministic alignment points.
Key Outcomes of MTS
- Phase-coherent sampling across channels, independent of tile.
- Deterministic latency, repeatable across resets and power cycles.
- Reduced calibration overhead, compared to external synchronization methods.
By ensuring all ADC and DAC channels operate with coherent timing, MTS forms the basis for beamforming, correlation, and phase-sensitive processing.
Why Multi-Tile Synchronization Matters and Relevance?
MTS is fundamental for RF systems that demand channel-to-channel coherence:
- Phased Array Radar & Electronic Warfare – Sub-degree phase mismatch can significantly degrade beamforming gain and angular resolution
- 5G Massive MIMO – Multi-antenna base stations need coherent sampling for uplink and downlink streams to maintain spectral efficiency and minimize interference.
- Radio Astronomy – Telescope arrays rely on phase-coherent sampling to perform correlation and beamforming across distributed antennas.
- Test & Measurement – Deterministic timing ensures reproducibility and accuracy in high-performance instruments.
Technical Validation of MTS with iWave’s RF Analyzer Demo
To demonstrate MTS in practice, iWave validated synchronization on its iW-RainboW-G42P Development Platform, powered by the ZU49DR RFSoC System on Module. Using the AMD RF Analyzer software, the demo confirmed channel alignment across multiple DAC and ADC tiles.
Accessories Used
- ZU49DR (-1I) SOM Development Platform
- RF SMA Cables
- Type-C to Type-A USB cable
- Windows PC
Software Used
- AMD RF Analyzer Tool 2024.1
- UART console Software
- RF Analyzer Design Version (External PLL): 49-1I-R30-ID20-24_2-EP-MTS-R1_0
- SW Release Version: iW-PRGFZ-SC-01-R3.0-REL1.0-ID2.0-Yocto-Scarthgap-V24.2
Test Setup
- Hardware: iW-RainboW-G42P ZU49DR SoM on PCIe carrier board.
- Connections: SMA loopback cables from DAC outputs to ADC inputs.
- Power: 12V external power supply, USB debug interface.
- Software: RF Analyzer (2024.1 release) for FPGA bitstream loading and channel configuration.
SMA cables connection procedure:
| Pair | DAC | SMA | BALUN Bandwidth | SMA Cable | ADC | SMA |
|---|---|---|---|---|---|---|
| 1 | DAC0 | J46 | 10MHz to 3GHz | 141-12SM+ | ADC0 | J21 |
| 2 | DAC4 | J46 | 10MHz to 3GHz | 141-12SM+ | ADC4 | J18 |
| 3 | DAC8 | J34 | 10MHz to 3GHz | 141-12SM+ | ADC8 | J26 |
| 4 | DAC12 | J42 | 10MHz to 3GHz | 141-12SM+ | ADC12 | J27 |
RF Loopback Connections
Follow the SMA cables loopback connections as per the below image
SMA Cables Loopback Connection
Demo Procedure
- Configure the FPGA and SoM – Load the prebuilt bitstream and initialize the RFSoC resources.
- Calibrate the ADC/DAC tiles – Ensure reference clocks and SYSREF signals were properly aligned.
- Capture and visualize signals – Perform FFT and time-domain analysis of the sampled waveforms across multiple channels.
Outcome
4 ADC Channels are not in Sync
4 ADC Channels are in Sync
The before-and-after comparison clearly demonstrated the impact of MTS. Initially misaligned channels became tightly synchronized after enabling MTS on both DAC and ADC tiles. The results validated:
- Deterministic alignment across converter tiles.
- Phase coherence suitable for beamforming and correlation.
- Repeatable synchronization across multiple acquisitions.
This practical validation highlights how iWave’s SoM platforms and AMD’s RF Analyzer environment provide engineers with a straightforward way to evaluate and leverage MTS in real-world applications. Watch the complete step-by-step RF Analyzer demo on our YouTube.
iWave’s Role in Enabling Synchronization
iWave platforms extend MTS from device-level validation to production-scale systems by providing:
- Pre-validated clock tree architectures with deterministic SYSREF distribution.
- Carrier boards engineered for JESD204B/C backhaul, ensuring alignment from chip to system level.
- Software toolchains supporting rapid evaluation and integration of MTS features.
iWave’s ZU49DR SoM platform and RF Analyzer validation confirm the feasibility of achieving sub-sample channel alignment, critical for beamforming, MIMO, and correlation-based applications.
Through engineered SoMs, carrier boards, and system-level synchronization expertise, iWave accelerates the deployment of synchronized RF systems from prototyping to production.
For more information on iWave’s RFSoC solutions and synchronization capabilities, contact mktg@iwave-global.com.
