Signal integrity & simulation considerations in VPX backplane designs

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1 Signal integrity & simulation considerations in VPX backplane designs Ovidiu Mesesan Embedded Tech Trends, Jan 22-23

2 Connectorization & standardization Advances and challenges in connector technology 2

3 Connector issues Passivity, causality, footprints design & optimization 3

4 Channel simulation & design Connectors as part of the channel model 5 Aggressors scenario Aggressor 2 Aggressor 3 Aggressor 5 Aggressor 4 Victim Pair Aggressor on L /9/ on L /9/ on L /9/ on L /9/ on L /9/ on L /9/3.75 BGA vias Switch card Megtron 6 VPX mated connectors models D7/E7 E7/F7 A7/B7 A7/B7 D9/E9 E9/F9 Slot 6 A9/B9 A9/B9 B8/C8 C8/D8 E8/F8 G8/H8 Alan 4.26 L L L18 Backplane Megtron 6 4.8/6/4.8 L L L These are 3 separate connector models & footprint models G8/H8 E8/F8 Slot 2 Conn 1 C8/D8 B8/C8 G8/H8 E8/F8 Slot 4 Conn 2 C8/D8 B8/C8 G8/H8 E8/F8 Slot 12 Conn 3 C8/D8 B8/C8 Ovidiu 5.17 on L /4.5/4.25 BGA vias 3.86 on L16 4/4/4 5.5 on L18 5/4.75/5 Tachyon 1G Payload card Nelco 4-13SI Payload card FR48HR Payload card Chris Nancy Derek 4

5 S-parameters S-parameters cascading issues (the good, the bad and the ugly) Scattering transfer parameters Everybody s doing it! (Αριστοτέλης, "Tὰ μετὰ τὰ φυσικά, cca 33 BCE) The totality is not, as it were, a mere heap, but the whole is something besides the parts. (Aristotle, "Metaphysics, Book VIII, 145a.9) (Heidi Barnes, cca 28 CE) 5

6 Channel simulation Simulations assumptions A simulation can only be as good as the models and assumptions that are being used in the process! Image courtesy of Polar Instruments (Spur Electron Limited, Havant, Hampshire, UK) Image courtesy of Taconic Advanced Dielectric Division 6

7 Channel design SI flow 7

8 Backplane channel measurements Measurements and why good launches are necessary Differential Insertion Loss of worst case Data Plane channel Sdd21 (IL) de-embedded ILmax(f) (IEEE) Sdd21 (IL) not de-embedded -4-6 db GHz Return Loss of worst case Data Plane channel GHz Insertion Loss Deviation for worst case de-embedded Data Plane channel GHz ILD(f) Sdd11 (RL) de-embedded RLmax(f) (IEEE) Sdd11 (RL) not de-embedded ILDmax(f) (IEEE) ILDmin(f) (IEEE) db -45 db 8

9 Channel co-design (& co-simulation!) (or Why Nancy, Alan, Derek, Chris & Ovidiu shouldn t have a Mexican standoff ) Insertion Loss:Elma 1G BASE KR Long BP Derek s existing design Insertion Loss: Elma 1G BASE KR Long BP Recommended A Derek s improved design -1 5 Insertion Loss Deviation:Elma 1G BASE KR Long BP -1 5 Insertion Loss Deviation: Elma 1G BASE KR Long BP Recommended A 5.GHz GHz Range: 4.47 db Range: 1.83 db -6 Simulated Link-Sdd56 Simulated Link LS IL Mask High IL Mask Low Return Loss:Elma 1G BASE KR Long BP Simulated Link-Sdd55 Return Loss Mask IL Deviation Simulated-Sdd56 IL Deviation High IL Deviation Low Insertion Loss and Crosstalk:Elma 1G BASE KR Long BP Next1x1, Next2x1, Next3x1, Fext1x1, Fext3x1 5.GHz -6 Simulated Link-Sdd56 Simulated Link LS IL Mask High IL Mask Low Return Loss: Elma 1G BASE KR Long BP Recommended A Simulated Link-Sdd55 Return Loss Mask -3-4 IL Deviation Simulated-Sdd56 IL Deviation High IL Deviation Low Insertion Loss and Crosstalk: Elma 1G BASE KR Long BP Recommended A Next1x1, Next2x1, Next3x1, Fext1x1, Fext3x1 5.GHz GHz GHz Sdd56 TotalXTK:RMS Sdd56 TotalXTK:RMS

10 Channel co-design Improvements vias on daughtercards and backplane Differential Insertion and Return Loss: New Backplane RT-2 Via Model sdd12 sdd

11 Channel co-design Improvements for a common goal 11

12 Questions? Thank you for your time! Ovidiu Mesesan Embedded Tech Trends 218 Austin, Texas

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