Design and test of a prototype of a flex cable for high speed transmission
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Design and test of a prototype of a flex cable for high speed transmission. Jan Buytaert ( CERN), Daniel Esperante, Pablo Vázquez, Jevgenij Visniakov (USC). What we have done. Design of the cable. What we can do.

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Design and test of a prototype of a flex cable for high speed transmission

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Design and test of a prototype of a flex cable for high speed transmission

Design and test of a prototype of aflex cable for high speed transmission

Jan Buytaert (CERN), Daniel Esperante, Pablo Vázquez, Jevgenij Visniakov (USC)


What we have done

Whatwehave done

  • Design of the cable

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What we can do

Whatwe can do

  • MeasuretheS-parameters of decoupledlineswith a VNA HP8719D (13.5 GHz) in Santiago

  • Helpwithmanpowertomeasure in otherlabs

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Cable design goals

Cable designgoals

  • Toprovethatisfeasibletobuild a highspeedflex cable in CERN labs

    • as no companieswerefoundto produce longerthan 55 cm (> 65 cm needed)

  • Characterizethetransmissionlines (31 in total)

  • Test transmissionthrough a fine pitch connector

    • Molex 5024304410

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Cable divided in areas for different studies

Cable divided in areasfordifferentstudies

  • Area 1: effect of a miniature fine pitch connector

    • This area is cut-off in two pieces

  • Area 2: parameters of decoupled strip-lines

  • Area 3: parameters of edge coupled differential striplines

  • Area 4: effect of viasongnd traces

  • Area 5: lengthdependance: 0, 56, 75, 100 cm

Area 1 (6 lines)

Area 1 (6 lines)

Area 2 (6 lines)

Area 3 (10 lines)

270 mm

SMA

connectors

onbothends

Area 4 (5 lines)

Area 5 (4 lines)

570 mm (pyraluxwidth – handlingmargin)

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Cable profile

Cable profile

  • Edge coupled differential striplines separated with gnd traces

  • Made out of 2 foils of pyralux AP- PLUS AP7229R

    • Dielectric Constant = 3.4

    • Dissipation Factor (Loss tangent) = 0.002

  • Z iscalculatedwith Rogers MWI-2010 toolwhichdoes not includeGnd traces overstimation (~ 5-10% ?)

TOP

G

Dg1

Wd1

D

Wd2

Dg2

G

SIGNAL

18 um

500 um

Gnd

S+

S-

Gnd

BOTTOM

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Area 1 miniature fine pitch 400 um connector

Area 1: miniature fine pitch (400 um) connector

  • Twogroups of 3 lines, onegroup per side of theconnector

    • (L1, L2, L3) = (L4, L5, L6)

  • L1, L2: S+ and S- match the pitch of the connector (L1 = L10 in Area3)

    • crosstalk and impedance

    • insertion loss of connector

  • L3: S+ and S- twice the pitch of the connector (L3 = L3 in Area 3)

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Area 2 decoupled striplines

Area 2: decoupled striplines

  • (L1,L2), (L3,L4) and (L5,L6) are 3 pairs for differential transmission

    • Impedance, crosstalk, bit error rate (BER)

    • decoupled (area 2) versus coupled (area 3) transmission lines

  • (L3,L4) and (L5,L6): parameter ‘Wd’

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Area 3 coupled differential striplines

Area 3: coupled differential striplines

  • L1-L3: distance signal to signal ‘D’

  • L3-L5: distance signal to gnd ‘Dg’

  • L3, L6: width of signal ‘Wd’ (D=500)

  • L7-L9: width of signal ‘Wd’ (D=250)

  • L10: D=400 um

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Area 4 striplines without vias on gnd traces

Area 4: striplines without vias on gnd traces

  • L1-L5 = L1-L5 of Area 3 (whitoutviasongnd traces)

  • No vias gnd traces width ‘G’ = 300um

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Top ground layer

TOP groundlayer

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Signal layer

SIGNAL layer

Grid to avoid delamination

Lines are routedturningleft – righttoequalizeall trace lengths

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Drill layer

DRILL layer

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Bottom ground layer

BOTTOM groundlayer

Openingson top/bottomlayerstoallowqualityevaluation:

gluing, etching… of traces (and cutting-off)

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Detail end of transmission lines

Detail: end of transmissionlines

  • Surface mount SMA and find pitch connectors mounted directly on signal layer to avoid vias on signal traces

  • 4 viascloseto SMA connector and 1 viaevery 10 mm ongnd traces toimprovegroundconnection

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Detail fine pitch molex connector

Detail: fine pitch molexconnector

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