TITLE. Design of Flyover QSFP (FQSFP) for 56+ Gbps applications. Image. Authors

Transcription

1 TITLE Tpic: Nam elementum cmmd mattis. Pellentesque Design f Flyver QSFP (FQSFP) fr 56+ Gbps applicatins malesuada blandit euismd. Presented by Jim Nadlny, Samtec Tpic: Authrs Nam elementum cmmd mattis. Pellentesque malesuada blandit euismd. Nam elementum cmmd mattis. Pellentesque Kyungchul K(1), Pranay Vuppunutala(1), Jim Nadlny(3), Atieh Talebzadeh(1), malesuada blandit Yuan euismd. Chen(1), Qian Wang(2), Ben Cper(3), David Pmmerenke(1), Tpic: James L. Drewniak(1) Nam elementum cmmd mattis. Pellentesque malesuada blandit euismd. (1) Missuri University f Science and Technlgy (2) Xilinx (3) Samtec Image

2 SPEAKER Jim Nadlny Principle SI & EMI Engineer, Samtec

3 Wrker Necessary Lubricant

4 Outline Intrductin Twinax vs PCB traces Flyver Technlgy and FQSFP Ethernet Intercnnect requirements EMI Characterizatin f FQSFP Design f Test Vehicle Cmputatinal apprach Crrelatin Effrts Next Steps

5 Intrductin Twinax vs PCB traces Cmpare the insertin lss f 30 AWG twinax with a 5 mil trace n Meg6 The mtivatin is t take advantage f the reduced attenuatin that twinax cable prvides

6 Intrductin Flyver Technlgy and FQSFP A shrt, high perfrmance cnnectr near the switch chip

7 Intrductin Flyver Technlgy and FQSFP A QSFP cnnectr with direct attach twinax

8 Intrductin Flyver Technlgy and FQSFP Ag Plated Cu Slid Center Cnductr Advanced Cu Ally Twinax Shield Lw Dk FEP Dielectric c-extruded Technlgy Twinax cable designed fr suckut free perfrmance

9 Intrductin IEEE 802.3bs intercnnect requirements Frnt panel pluggable slutins (QSFP) are qualified using cmpliance bards Hst cmpliance bard tests the mdule Mdule cmpliance bard test the hst Cmpliance bards fr 100 GbE are defined in IEEE 802.3bj (4 channels at 28 Gbps NRZ) Cmpliance bards fr 400 GbE are the same as IEEE 802.3bj (8 channels at 56 Gbps PAM4) This may evlve as PAM4 implementatins mature T shw 56 Gbps PAM4 cmpliance, we take a mated hst-mdule cmpliance bard apprach

10 Intrductin IEEE 802.3bs intercnnect requirements Mdule cmpliance bard Hst cmpliance bard PCB Hst cmpliance bard Reference plane lcatin T shw 56 Gbps PAM4 cmpliance, we take a mated hst-mdule cmpliance bard apprach

11 Intrductin Mated cmpliance bard limits FQSFP simulated data T shw 56 Gbps PAM4 cmpliance, we take a mated hst-mdule cmpliance bard apprach

12 EMI Characterizatin f FQSFP Apprach: Full wave simulatins f small, simple structures Quick(er) cmputatinal time Validate with measurements Build cnfidence that future steps are built n slid grund Start with the QSFP cnnectr Incrementally build the mdel and validatin vehicles Avid the rkie mistake f putting the entire cable assembly, EMI cage, chassis mdel and PCBs int CST/HFSS and simulating the ttal radiated pwer (TRP)

13 EMI Characterizatin f FQSFP Design f test vehicle

14 EMI Characterizatin f FQSFP Cmputatinal Apprach

15 EMI Characterizatin f FQSFP Tweaking the mdel t reflect the test vehicle

16 EMI Characterizatin f FQSFP S-Parameter Measurements

17 EMI Characterizatin f FQSFP Time Dmain Crrelatin

18 EMI Characterizatin f FQSFP Full Wave Simulatin Energize the twinax cable Energy excites the cnnectr, PCB, etc. Ttal radiated pwer cmputed by integrating ver the cmputatinal dmain Sim time 3-4 hurs with CST MS and GPU acceleratin

19 EMI Characterizatin f FQSFP TRP Measurements As with S-parameter measurements, calibratin is required t cmpensate fr reflectins and attenuatin. Methdlgy is NIST traceable

20 EMI Characterizatin f FQSFP TRP Measurements We measured the radiatin frm just the cnnectr

21 EMI Characterizatin f FQSFP TRP Measurements We measured the radiatin frm just the cnnectr

22 EMI Characterizatin f FQSFP TRP Measurements Differential results shw pr crrelatin

23 EMI Characterizatin f FQSFP Crrelatin effrts Differential crrelatin imprvement when instrumentatin skew is cmpensated

24 Next Steps Mre fully explre the twinax t EMI cage terminatin Add the card cage Add ptical mdules Optical ferrule radiatin Expand frequency range t 40 GHz

25 MORE INFORMATION Websites emclab.mst.edu Samtec.cm Cntact inf Pranay Vuppunutala Kyungchul K ath27@mst.edu, Atieh Talebzadeh jim.nadlny@samtec.cm, Jim Nadlny

26 Thank yu! --- QUESTIONS?