STATUS OF THE CRESCENT FLEX-TAPES FOR THE ATLAS PIXEL

DISKS

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Using the Bonn Quad Flex Design or the Liverpool Quad Flex

Pros- Using the Existing Bonn Quad Flex Design- Minimum or virtually no TAB bending- Ideal for use on the bench and interconnect peripherals- Fastest required design time

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Cons- Not suitable for the most inner and most outer rings- Tabs may be floppy but stiffeners will be added

Prototype Choice

New Approach

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The outline of the Flex Tape

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TAB5

EOS DATA TABEOS PWR TAB

TAB4

TAB3

TAB2

TAB1

28.46mm

Dimensions 300mm x 86 mmDimensions 350 to 100mm

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• 4 Layer Design

• Dimensions: 350mm x 100mm before cutting

• 150 um minimum Trace width and Clearance

• Minimum VIA diameter 0.4 mm (0.2mm hole)

• VIAs going through all 4 Layers

• Minimize material wherever possible

• Special Cutting of the Tape’s shape

• 200um thick rigidizers supporting the connectors of the flex on the opposite side

• Quantity: 3 to 5 items

• Option to Solder either 40 pin Connector for higher current or a 30 pin Connector for compatibility with the Bonn Flex

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Features

Quoted Prices from Flexible Technologies

50 um LFO110 (Kapton+Adhesive)

18 um Cu Layer 1 Connectors and stiches <10% Coverage

50 um KAPTON AP8525

18 um Cu LAYER 2 LVDS Traces <50% Coverage

50 um LF0200 ADHESIVE

35 um LAYER 3 PWR / GND <90% Coverage

50 um KAPTON AP9121

35 um LAYER 4 HV TRACES <15% Coverage

50 um LFO110 (Kapton+Adhesive)

50 um LF0200 ADHESIVE 50 um LF0200 ADHESIVE

<-- 35 um Cu HV

Main Flex Tape with

module TABS and

End of Structure

part

LFO110 Adhesive

End of Structure TAB

356

um in

tota

l

Module TAB

200 glass epoxy or FR4 or other material for Stiffness

200 um glass epoxy or FR4 or other material for Stiffness

Inter-Track Insulation using Kapton and Adhesive

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Layer Stack for the crescent Flex Tape

Reflecting Manufacturercapabilities

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Status of the Prototype Crescent Tape

Done- Completed Routing of the High Speed Signals Layer- Completed Routing of the Serial Power Layer- Completed Routing of the HV Layer- Completely Routed the first TAB- Received Price Quote from Flexible Technologies

Doing- Investigating Routing Automation for the TABs

To Do by 28/02/2014- Routing all Module TABs- Routing Eos TABs- Finalise the contour of the Tape- Send for Fabrication G.Sidiropoulos

New Approach

Differential Pairs150 um Trace width and Clearance

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Status of the Prototype Crescent Tape

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New Approach

Serial Power5mm Trace width 200um Clearance

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Status of the Prototype Crescent Tape

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New Approach

High Voltage Distribution200 um Trace width 800um ClearanceThere is space to increase the clearance

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Various Detailed Views

Area Left for Wire-bondingFingers

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Low profile Stacking Connectors from Panasonic

Interconnecting the tape with the modules and the End of Structure Card 1/2

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P4S Series Connectors 0.4mm pitch

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Low profile Stacking Connectors from Panasonic

Interconnecting the tape with the modules and the End of Structure Card 2/2

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P4S Series Connectors 0.4mm pitch

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Connector Availability

Interconnecting the tape with the modules and the End of Structure Card 2/2

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Flex Tape Module TAB Flex Tape EoS TAB

Quad Flex Module TAB EoS Adapter Card

Source

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Diskette Flex Tapes

Summary

• Changed TABs modularity from 9 to 5 per crescent tape

• Upgraded the Connector to allow more current available to the Quads

• Using both Connectors and Wire bond fingers (Awaiting info from Ilya)

• Investigated the short term and fastest to implement solution with an eye on fast prototyping and bench testing as well

• Design is >70% Complete

• Received Price Quote for fabrication

• Investigated Connector Availability

• Started Investigating a longer term scenario that will cover the most inner and outer rings

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Something funny for the end. Have a nice Day

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Backup Slides

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The Bonn Quad Flex

Things to figure out

• How to handle the tiny parts on the flex for soldering• What to use as a rigidizer during the parts assembly on the flex. How to

attach/remove it.• How to glue the sensors …

Quad Flex

Pixel Sensor

Front End ASIC (FE-IXx)

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What the custom Quad Flex would look like(thanks to some Photoshoping )

Quad Flex

Things to figure out

• Were to put the connector pigtail• What would be the length of the pigtail…

Image of the 30 pin matting (socket) connector on the flex tape side40 pin connectors to be ordered soon

AXT630224

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The layout of the tape for outer Single Ring tape

This is the bottom view for the tape.Wire Bonding Footprints are on the bottom side and they will fold facing front

Typical TAB dimensions are 47x14mm and EoS part dimensions are 160x42mm.

Current Tape width is 13 mm. Ideal would be 15mm to fully readout all modules

Note: The ends of the tape near to the pipe are “smoothed”

175o

155o

135o

115o95o 75o

55o

35o

15o

0o

TAB5

TAB

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EoS TAB

Tape 1Tape 2Tape 3

406

3

2

1

5 39

Mountingsoldering

pads

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Replace with Connectors?

Replace with

ConnectorsUsed in IBL

Previous Approach

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Differential Impedance for the High Speed Traces

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We need a lot more material if we have the High speed traces in an internal layer and covered with a top hatched ground plane

Sourcehttp://www.eeweb.com/toolbox/edge-coupled-microstrip-impedance/

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Scenario 2: Using a custom made Quad Flex for the Endcaps

Pros- Smaller length on the TABS- Suitable for the most inner and most outer rings- TABS can be bended to be parallel to the Beam pipe

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Cons- Requires a custom made Quad Flex design- Several things to ponder on before adopting- Bending tests will be needed

Future Choice

New Approach

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Scenario 2: Using a custom made Quad Flex for the Endcaps

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Image by Fred Cannaway

New Approach

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Connector Pin-outs

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AXE_30 pol SLHC and IBL flex

Used on the Bonn Flex

Proposed to be used in IBL

Only 2 Diff pairs for read out when 4 are needed(1 per FEI-4). Possible use of multiplexing?

Workaround: Add the 20 lines needed onTABs 6-8

Reasons for Using Connectors

Drawback:Not enough power pinsselected to handle therequired current fora Quad Module

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Upgrading the Connectors for Higher CurrentAXE_30 pol SLHC and IBL flex

AXE_40 pol SLHC flex

Bottom side of the Bonn flex viewed from top (mirrored)The pin numbering has a circular increasing pattern

Pin numbering has an increasing pattern in 2 rowsThus the suggested pin-out for the 40 pin connector on theQuad flex connector has to change again