About
In 2022, PTP became available to the masses thanks to the availability of the Raspberry Pi Compute Module 4 and its PTP compatible network interface [1], and now the Compute Module 5. In the meantime, PTP High Accuracy's White Rabbit has remained confined to dedicated boards providing the external oscillators needed to generate the beatnote for fine phase measurement, until 2024's Missing Link Electronics presentation of the Light Rabbit Implementation targetting the Ettus Research X310 SDR and demonstrated on the ZC706 board [2]. Thanks to this breakthrough contribution shared as open-source software on the OpenHardware repository, and relying on Nikhef's CLBv3 design [3], we demonstrate the functional implementation of White Rabbit on Enjoy Digital's Acorn CLE125 board [4]. In this presentation we detail the steps needed to achieve a functional demonstration and some phase noise and Allan deviation stability measurements as a function of software-phase locked loop gain parameters. These results open the path towards integrating White Rabbit into Enjoy Digital's M2SDR software defined radio board [5] and reaching the target of a network of coherent, distributed software defined radio transceivers for large scale beamforming or direction of arrival measurements, including passive RADAR applications. The results of these developments are documented at https://github.com/oscimp/wr_acorn aimed at helping the audience to reproduce and expand the results..
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The talk
Credits and licence
- Institution
- CERN
- Department
- Meetings and/or Vidyo with external partners
- Taught by
- Jean Michel Friedt, Emilien Decoux
- Year
- 2025
- Language
- English
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
- CERN gives no rating. Invisible Network shows it to Teens profiles and older, judged from what the source says about it. How courses are placed