GOLAux Boards and Optical Links

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GOL/Aux Boards and Optical Links
Dirk Wiedner, Physikalisches Institut der
Universität Heidelberg
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Optical link Overview

• GOL-Aux Board
• 128 channel Data
• GOL serializer
• VCSEL
• Fiber
• 50/125 um 12 fiber ribbon
• O-RxCard
• 12 fiber Optical Receiver
• 12 deserializers

FE-Box
4 x OTIS TDC Data
9 x
GOL-Aux Board
O-RxCard
TELL1
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GOL-Auxiliary Board

• GOL 1.0 serializer for 128 straw channels
• QPLL clock filter
• TFC signal distribution
• I2C signal distribution
• LV-power regulators

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Bit Error Rate Test

• Gigabit Optical Link
• Counter Data 32 Bit _at_ 40 MHz at GOL in
• 1.6 Gb/s optical transmission
• Deserialization, bit error check
• No Data error in 15 d

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QPLL setup

• QPLL on GOL Auxiliary Board
• Clock from synthesizer
• 1040MHz, 100 Hz adj.
• TFC distribution
• QPLL connected to GOL 4 TDC chips

Clock Generator
TTCvx
TTCrm
LVDS driver
QPLL
GOL/TDC
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Clock Distribution

• Master Clock
• Clock at QPLL
• differential
• subtracted
• Clock after optical transmission

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LVDS distribution

• active or passive LVDS distribution mandatory
• active distribution
• Fast LVDS buffers
• rad hard?
• passive distribution
• current division
• successfully tested

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Power Regulators (1/2)

• 2.5V, 3V, -3V
• load 32.4 -0.9 Ohm
• positive regulators
• 300 mV oscillations
• 100 mV osc. after power cycle

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Power Regulators (2/2)

• negative regulators
• up to 2V oscillations _at_ 6 to 25 kHz
• three types tested
• 22 uF Tantal added 24mV oscillations

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Fiber Specifications

• 50/125 MM fibers
• MTP/MPO connectorized optical ribbon to trailer
• SMA VCSEL
• breakout from MTP/MTO to 12 LC/SMA

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Fiber Cabling

• 432 VCSEL diodes
• 9 single fibers into optical ribbon (5m)
• on frame patch panel
• 48 optical ribbons to trailer patch panel (70m)
• 48 ribbon fibers from trailer patch panel to
  O-RxCards/TELL1
• extra (ribbon) fibers for TFC/ECS signals
• Radiation and CERN IS23 qualification done

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O-RxCard

• 12 way optical Receiver
• commercial deserializers
• high density connector

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O-RxCard Prototypes produced

• 5 Cards produced
• BGA assembly done
• 3 Cards fully equipped

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Migration of Optical receivers
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Testing the O-RxCard

• Analog signal test (Zürich ST)
• analog signal -gt ADC -gt GOL -gt O-RxCard -gt Demux
  -gt DACs -gt oscilloscope
• Digital test
• Pseudo Random Bit Loop back
• FPGA -gt GOL -gt O-RxCard -gt FPGA
• BERT improved
• StratixS25-PCI card with adapter board/cable
• CERN/TELL1 setup

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Test bench AS-24-0 fan out to 1/10 connectors

• Fan out for all O-RxCard signals
• from 1/40 inch to 1/10 inch
• 1 AS24-0 per Samtec
• LVDS output test adapter in production

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Digital counting data transmission

• Counter Data
• FPGA
• GOL-AUX
• O-RxCard
• Clock source
• O-RxCard on board quartz
• external generator
• VSCEL
• ULM Photonics SMA (ST)
• Honeywell, LC

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Summary

• GOL-Aux Prototype IF13-0 works with minor
  modifications
• Optical Fiber rad/IS23 qualified and tested (ST)
• O-RxCards prototypes produced and tested

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Analogue Beetle Data transmission for ST

• Beetle
• FADC
• GOL
• VCSEL
• Fiber
• O-RxCard
• Analog test bench
• Oscilloscope