[time-nuts] White Rabbit time distribution performance

Arnold Tibus arnold.tibus at gmx.de
Mon Jul 2 16:51:24 EDT 2018


Thank you very much Mattia -
I am interested to read and to learn - but I see:
"Sign in or purchase", not loved by everybody, and I have no membership,
a pity, sorry.

My best wishes,

Arnold, DK2WT


Am 02.07.2018 um 21:37 schrieb Mattia Rizzi:
> Hello!
> I published a paper on WR time distribution performance that you might
> consider interesting. It's available at IEEExplorer:
> https://ieeexplore.ieee.org/document/8400550/
> 
> Abstract:
> This article investigates the ultimate limits of White Rabbit (WR), an
> high-accuracy time distribution system based on FPGA. The knowledge of such
> limits is essential for new emerging applications that are evaluating WR.
> In this article, we identify and study the key elements in the WR
> synchronization: the Digital Dual Mixer Time Difference phase detector and
> the Gigabit Ethernet transceiver. The benchmarks and experimental analysis
> of these key elements allow us to determine the WR Switch performance
> limits and evaluate their evolution with newer FPGAs. The identified
> performance limits are achievable by the present-day generation of WR
> Switch. The ultimate limits of short-term synchronization performance due
> to FPGA implementation have been derived through analysis and then
> demonstrated using the existing WR Switch enhanced with an additional
> daughter-board. This combination (WR Switch and daughter-board) achieves a
> tenfold improvement in terms of phase noise, jitter and shortterm stability
> with respect to the current WR performance. Both phase detectors and
> Gigabit transceivers have a similar phase noise contribution equal to a
> short-term stability of MDEV 4E-13 at τ=1 s (dominated by flicker PM noise).
> 
> cheers
> Mattia
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