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65, no. 9, pp. 1726-1737, Sept. 2018. doi:
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10.1109/TUFFC.2018.2851842*
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![](/uploads/5948ffb2ef9835abdc2008567860af2d/rsz_3d_image__1_.jpg)
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![](https://ohwr.org/project/wrs-low-jitter/uploads/5948ffb2ef9835abdc2008567860af2d/rsz_3d_image__1_.jpg)
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**Image of the Low-Jitter Daughterboard**
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## Main Features
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- [Schematics-review](Schematics-review) 26/10/2016
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- [Layout-review](Layout-review) 21/11/2016
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- [WRS Low Jitter Daughterboard
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Report](https://www.ohwr.org/project/wrs-low-jitter/uploads/9d74ea481bff05b9fda1bb32dcd6ddea/lowjitterboard_report_v03.pdf),
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Report](https://ohwr.org/project/wrs-low-jitter/uploads/9d74ea481bff05b9fda1bb32dcd6ddea/lowjitterboard_report_v03.pdf),
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Seven Solutions, 8 June 2017
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-----
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## Research items
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- M. Rizzi et al., [White rabbit clock
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characteristics](https://www.ohwr.org/project/white-rabbit/uploads/2fa1a438446fc6c85b4540faecf1017a/ISPCS2016-WRClockCharacteristics.pdf)
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characteristics](https://ohwr.org/project/white-rabbit/uploads/2fa1a438446fc6c85b4540faecf1017a/ISPCS2016-WRClockCharacteristics.pdf)
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2016 IEEE International Symposium on Precision Clock Synchronization
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for Measurement, Control, and Communication (ISPCS), Stockholm,
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2016, pp. 1-6. doi: 10.1109/ISPCS.2016.7579514
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- M. Rizzi, et al. [White Rabbit Clock Synchronization: Ultimate
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Limits on Close-In Phase Noise and Short-Term Stability Due to FPGA
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Implementation](https://www.ohwr.org/project/white-rabbit/uploads/253cbfc17d2b43cd445b68348aee0374/Submitted_IEEE.pdf)
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Implementation](https://ohwr.org/project/white-rabbit/uploads/253cbfc17d2b43cd445b68348aee0374/Submitted_IEEE.pdf)
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in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency
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Control, vol. 65, no. 9, pp. 1726-1737, Sept. 2018. doi:
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10.1109/TUFFC.2018.2851842
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|**Date**|**Event**|
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|----|----|
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|23-10-2016|Preliminary version of the [Schematics](https://www.ohwr.org/project/wrs-low-jitter/uploads/7eb96aa55ee2b102a6b9b5437f5f4a41/Daughterboard_V2.pdf) ready for review|
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|23-10-2016|Preliminary version of the [Schematics](https://ohwr.org/project/wrs-low-jitter/uploads/7eb96aa55ee2b102a6b9b5437f5f4a41/Daughterboard_V2.pdf) ready for review|
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|26-10-2016|[Schematics-review](Schematics-review)|
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|21-11-2016|[Layout-Review](Layout-Review)|
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|09-12-2016|Got the boards|
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|26-12-2016|[Experimental results](Experimental-results), [mounting](Mounting) and [building](Gateware-and-software) instructions|
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|20-01-2017|Two boards shipped to Seven Solutions for evaluation.|
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|24-03-2017|Seven Solutions measures similar results as measured at CERN.|
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|08-06-2017|Seven Solutions published [WRS Low Jitter Daughterboard Report](https://www.ohwr.org/project/wrs-low-jitter/uploads/9d74ea481bff05b9fda1bb32dcd6ddea/lowjitterboard_report_v03.pdf)|
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|08-06-2017|Seven Solutions published [WRS Low Jitter Daughterboard Report](https://ohwr.org/project/wrs-low-jitter/uploads/9d74ea481bff05b9fda1bb32dcd6ddea/lowjitterboard_report_v03.pdf)|
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|25-09-2017|Two boards will be tested by VTT MIKES Metrology, Time & Frequency in Finland. Results expected by November|
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|27-10-2017|[Measurement results](https://library.nrao.edu/public/memos/ngvla/NGVLA_22.pdf) published with addition of extra clean-up OCXO.|
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|06-12-2017|Measurements by VTT MIKES confirm CERN measurements. <br/>These measurements are without an extra clean-up OCXO.|
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... | ... | @@ -148,4 +148,4 @@ Mattia Rizzi, Erik van der Bij - 12 June 2023 |
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### Files
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* [rsz_3d_image__1_.jpg](/uploads/5948ffb2ef9835abdc2008567860af2d/rsz_3d_image__1_.jpg) |
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* [rsz_3d_image__1_.jpg](https://ohwr.org/project/wrs-low-jitter/uploads/5948ffb2ef9835abdc2008567860af2d/rsz_3d_image__1_.jpg) |