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Author  |
Real, D.; Calvo, D.; Burriel, I.; Manzaneda, M.; Moreno, A.; Parra, I. |
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Title |
Design and Analysis of a Redundant, Low-Jitter Clocking System for White Rabbit Synchronization Switches |
Type |
Journal Article |
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Year |
2026 |
Publication |
Applied Sciences-Basel |
Abbreviated Journal |
Appl. Sci.-Basel |
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Volume |
16 |
Issue |
14 |
Pages |
7297 - 20pp |
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Keywords |
subnanosecond synchronization; White Rabbit; IEEE Std 1588-2019; virtual prototyping |
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Abstract |
This work presents the design and validation of a redundant, low-jitter clock architecture for White Rabbit (WR) Switches, developed to meet the growing demand for sub-nanosecond synchronization in distributed scientific and industrial systems. WR relies on two high-purity clock signals (125 MHz and 124.992 MHz) to perform picosecond-resolution phase measurements using the DDMTD method; therefore, clock quality directly determines synchronization accuracy. The proposed architecture introduces a dual-path oscillator subsystem combining two independent low-phase-noise crystal oscillators with a secondary VCXO-based synthesizer, enabling deterministic automatic failover and eliminating the PLL-based frequency-generation stage used in legacy designs. Advanced signal- and power-integrity simulations were employed to optimize impedance control, PDN performance, and crosstalk behavior across the multilayer PCB. Measurements on the prototype demonstrate a reduction in integrated jitter from approximately 300 ps in previous implementations to 35-55 ps in the primary path, while failover events exhibit a worst-case switchover time of 10 & micro;s and a maximum phase hit below 150 ps. These results confirm that the redesigned architecture significantly enhances synchronization robustness and clock stability, providing a reliable foundation for large-scale deployments in high-energy physics, telecommunications, industrial automation, and other domains requiring ultra-precise timing. |
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Address |
[Real, Diego; Calvo, David; Burriel, Ivan; Manzaneda, Mario; Moreno, Alberto; Parra, Irene] Univ Valencia, IFIC Inst Fis Corpuscular, CSIC, C-Catedrat Jose Beltran 2, Paterna 46980, Valencia, Spain, Email: real@ific.uv.es; |
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Publisher |
Mdpi |
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English |
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Notes |
WOS:001831555100001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
7348 |
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