High Precision Timing Distribution for HLLHC Interest Group
High Precision Timing Distribution for HL-LHC Interest Group Meeting #5 – Activities & next steps E. Brandao de Souza Mendes, S. Baron 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 1
HPTD Activities • Newsletters • Timing Lab Guests • Available reports and documentation • Follow-up on targeted studies • Upcoming studies 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 2
Newsletters 11 Newsletters issued since May 2018 q. May 18: q. June 15: q. June 29: q. July 13: q. July 27: q. Sept 3: q. Sept 20: q. Nov 23: q. Jan 22: q. Feb 19: 12/04/2019 #1 Figures of merit for clock characterization in HEP #2 Periodic noise identification in phase-noise plots #3 Periodic noise effect on Time Interval Error measurement #4 Minutes of the second HPTD interest group meeting #5 Effect of a slow periodic noise on phase-noise and TIE #6 Effect of white-noise on phase-noise and TIE #7 Effect of PLL bandwidth on the phase-noise of a clock #8 High Precision Timing Working Group at TWEPP 2018 #9 Effect of Rx Equalizer modes on phase determinism for Xilinx FPGAs #10 The lp. GBT clock quality (preliminary) #11 Phase Determinism on Silicon Labs PLLs HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 3
Timing Lab Guests since December • LHCb for PLL characterization on the PCIe 40 • ATLAS JFEX for on-board clock characterization and clock quality study w. r. t. the position of the board in the ATCA shelf • ATLAS NSW measurement of phase-noise in their new FE board 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 4
Available Reports and Documentation • https: //espace. cern. ch/High. Precision. Timing * New since December meeting Some interesting and recent reports: Frequency Ramp studies …On Silabs PLLs* HPTD …On GBT link (GBT-FPGA to GBTx) HPTD Phase noise on Silabs PLLs* HPTD Skew over temperature* HPTD Si 5344 implementation studies CMS Lp. GBT Preliminary Jitter Study HPTD FPGA transceivers Impact of Xilinx Rx equalizers on jitter HPTD HPT IP core reference note HPTD Optical fiber delays versus temperature HPTD Attenuation effect on Versatile Link Plus* HPTD CMS Ecal Pure clock distribution CMS Clock quality on a GBT based cascaded system HPTD PLL survey Optical transceivers & fibers Distribution Systems 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 5
Targeted Studies: follow-up on PLLs (1/3) • Benchmark of Latest PLLs (Si 5345 B, Si 5345 D, Si 5391, Si 5395) - completed 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 6
Targeted Studies: follow-up on PLLs (2/3) • Si. Labs PLL behaviour with temperature 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 7
Targeted Studies: follow-up on PLLs (3/3) • Tracking the LHC frequency ramp with the Si. Labs PLLs 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 8
Targeted Studies: follow-up on links • Versatile Link+: optical link margin impact on jitter of recovered clock • Answers the question: how do optical link margins affect timing margins? … 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 9
Upcoming Targeted Studies (1/4) • Optimizing Si 5344 PLL implementation for high performance • Follow-up on DTH studies on PLL implementation (with TCXO and XTAL) • PCB design with a Si 5344 using an OCXO reference (Oven Controlled Xtal Oscillator) • Evaluation of Si 5344 together with OCXO to see if bandwidth can be further decreased without major penalty • Create a small clock generator of relatively good quality for CERN applications – frequencies of 40 MHz, 240 MHz and 320 MHz http: //www. conwin. com/datasheets/cx/cx 210. pdf http: //www. rakon. com/products/families/ocxo-ocso (rox 2522 s 4) https: //ecsxtal. com/store/pdf/ECOC-2522. pdf 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 10
Upcoming Targeted Studies (2/4) • Performing a first pass on the survey of optical components • Fireflies and evaluation boards ordered 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 11
Upcoming Targeted Studies (3/4) • Lp. GBT further characterization (timing performance) • Lp. GBT characterization board in production • HPT IP core characterization with Lp. GBT 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 12
Upcoming Targeted Studies (4/4) • Now focusing on impact of low frequency jitter and wander on clock distribution • Phase monitoring and compensation scheme (TCLink) • • Under design Protocol agnostic IP Based on DDMTD on a loopback scheme Compensation on the Tx side using the Tx PI Proof of concept principle 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 13
Upcoming Targeted Studies (4/4) • Proposal: run embedded/pure clock distribution systems concurrently in timing lab WHAT ABOUT ONE WEEK ANYTIME IN JUNE ? 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 14
Next HPTD IG meeting • July at CERN ? September at TWEPP? • Date ? • Topics? SUGGESTIONS WELCOME! 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 15
THANKS Next appointment: CERN, March 2019 12/04/2019 HPTD Interest Group - Meeting #5 - Activities & next steps - sophie. baron@cern. ch 16
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