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ECE 135 ECE 135 Final PresentationFinal Presentation
The Three … akaThe Three … aka
Pat ClearyPat Clearywith Kevin Parker & Bryan Chavezwith Kevin Parker & Bryan Chavez
April 21April 21stst, 2005 , 2005
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ECE 135 ECE 135 Final PresentationFinal Presentation
The VCSEL Kings … akaThe VCSEL Kings … aka
Pat ClearyPat Clearywith Kevin Parker & Bryan Chavezwith Kevin Parker & Bryan Chavez
April 21April 21stst, 2005 , 2005
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ECE 135 ECE 135 Final PresentationFinal Presentation
RIO! … akaRIO! … aka
Pat ClearyPat Clearywith Kevin Parker & Bryan Chavezwith Kevin Parker & Bryan Chavez
April 21April 21stst, 2005 , 2005
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ECE 135 ECE 135 Final PresentationFinal Presentation
BtrLaytDanNvr BtrLaytDanNvr
Pat ClearyPat Clearywith Kevin Parker & Bryan Chavezwith Kevin Parker & Bryan Chavez
April 21April 21stst, 2005 , 2005
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IntroductionIntroduction
The Goal: The Goal: An IEEE 802.3 Standard Gigabit Ethernet LinkAn IEEE 802.3 Standard Gigabit Ethernet Link
The Components:The Components:Group and time management plan, background Group and time management plan, background
research, part selection, optical link budget, research, part selection, optical link budget, circuit design and layout, construction, and circuit design and layout, construction, and
troubleshooting. troubleshooting.
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Initial GANTT ChartInitial GANTT ChartID Task Name Start Finish Duration
Apr 2005Mar 2005Feb 2005Jan 2005
3/20 4/102/20 3/131/30 4/33/6 4/172/6 2/272/13 3/27 4/241/231/16
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3d1/21/20051/19/2005Group Management Plan
2w 4d2/7/20051/19/2005Background Research
8w4/1/20052/7/2005Board 1 Research
4w4/22/20053/28/2005Board 2 Research
1w1/28/20051/24/2005Evaluation Board Testing
1w2/4/20051/31/2005Optical Link Budget
1w2/4/20051/31/2005Part Selection
1w2/11/20052/7/2005Order VCSEL/PD’s
2w2/18/20052/7/2005Build Test Board
1w2/11/20052/7/2005Design Board 1 Schematic
1w2/18/20052/14/2005Board 1 Design
1w2/25/20052/21/2005Board 1 Design Review
1w3/4/20052/28/2005Order PCB’s
1w3/11/20053/7/2005Board 1 Construction
1w 2d3/21/20053/11/2005Spring Break
2w4/1/20053/21/2005Board 1 Testing/Troubleshooting
1w4/1/20053/28/2005Design Modifications
1w4/8/20054/4/2005Board 2 Construction
2w4/22/20054/11/2005Board 2 Testing/Troubleshooting
1w 3d4/27/20054/18/2005Final Report Prep
0w2/22/20052/22/2005Test
0w3/25/20053/25/2005Midterm Report
0w4/27/20054/27/2005Final Report
5/1
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Group ManagementGroup Management
TaskTask Task LeaderTask Leader Primary SupportPrimary Support
Organizational Organizational ManagementManagement
PatPat KevinKevin
Optical Link Optical Link DesignDesign
KevinKevin BryanBryan
Board LayoutBoard Layout BryanBryan PatPat
Board Board ConstructionConstruction
BryanBryan PatPat
TestingTesting KevinKevin BryanBryan
Report PrepReport Prep PatPat KevinKevin
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Background Research: OverviewBackground Research: Overview
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Background Research: TxBackground Research: Tx
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Background Research: RxBackground Research: Rx
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Background Research for Background Research for Four-Corners AnalysisFour-Corners Analysis
Eye safe limit Eye safe limit →→ P Pmaxmax = 1 mW = 1 mW
From the 802.3 standard From the 802.3 standard →→ extinction ratio = 9dBextinction ratio = 9dB
Thus we see that PThus we see that Pminmin = P = Pmaxmax *10^(-9/10) *10^(-9/10)
PPminmin = .12589 mW = .12589 mW
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VCSEL Four Corner AnalysisVCSEL Four Corner Analysis
HFE439x-521
Manufacturer Part I_th (mA)η (mW/mA)
I_tot(MAX) (mA)
I_tot(MIN) (mA) I_bias (mA) I_mod (mA)
Advanced Optical Components (2.5G) SC HFE439x-541 0.5 0.04 25.5000 3.6473 14.5736 21.8528
Advanced Optical Components (2.5G) SC HFE439x-541 2.5 0.04 27.5000 5.6473 16.5736 21.8528
Advanced Optical Components (2.5G) SC HFE439x-541 0.5 0.16 6.7500 1.2868 4.0184 5.4632
Advanced Optical Components (2.5G) SC HFE439x-541 2.5 0.16 8.7500 3.2868 6.0184 5.4632
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ROSA SelectionROSA Selection
HFD3180-108
ROSA Part #Part # Min (V/W) Typical (V/W) Max (V/W)
Advanced Optical Components (up to
2.5) (LC)
HFD3180-108 1500 2500 3500
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Optical Link BudgetOptical Link Budget
Advanced Optical Components Advanced Optical Components HFE419x-541 with HFE419x-541 with
HFD3180-108 ROSAHFD3180-108 ROSA
Ith (mA)Ith (mA) 1.81.8
DC Bias of laser (mA)DC Bias of laser (mA) 10.2910.29
Slope Efficiency (mW/mA)Slope Efficiency (mW/mA) 0.1250.125
Modulation Current of Tx (mA)Modulation Current of Tx (mA) 29.136929.1369
Range of Power Output (mW)Range of Power Output (mW) 0.12589 - 1.00.12589 - 1.0
Range of Power at Rx (mW) – 7.5 dB LossRange of Power at Rx (mW) – 7.5 dB Loss .02239 - .17783.02239 - .17783
Voltage Output Range from ROSA (mV)Voltage Output Range from ROSA (mV) 55.98 – 444.5855.98 – 444.58
Voltage Input Range for Maxim 3264 (mV)Voltage Input Range for Maxim 3264 (mV) 5 - 12005 - 1200
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Additional VCSEL PurchaseAdditional VCSEL Purchase
LC-TOSA
• 20 Free VCSELs Obtained
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Introduction to Test EquipmentIntroduction to Test Equipment
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Introduction to Test EquipmentIntroduction to Test Equipment
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Tx Test Board Construction …Tx Test Board Construction …
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… … And Immediate CorrectionAnd Immediate Correction
• Soldered Output Pins in Correct Locations
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Tx Test Board PerformanceTx Test Board Performance
““Best” Eye DiagramBest” Eye Diagram
PRBS7 PatternPRBS7 Pattern
Troubleshooting Troubleshooting NecessaryNecessary
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Tx Test Board Troubleshooting Tx Test Board Troubleshooting Grand ConclusionsGrand Conclusions
• Outputs and Inputs Reversed
• If one truly only learns through failure, we’ve learned a LOT already!
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More Tx Test Board WorkMore Tx Test Board Work
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Tx Test Board Quality ControlTx Test Board Quality Control
Input in InputInput in Input
Output in OutputOutput in Output
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Tx Test Board PerformanceTx Test Board Performance
No attenuationNo attenuation
PRBS7 PatternPRBS7 Pattern
Still not successful
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Tx Test Board ConclusionsTx Test Board Conclusions
• Eye still not well defined
• Potentiometer has minor effect on performance
• Conclusion: Board permanently damaged from attempts to drive in reverse direction
•Result: If continued testing is necessary a new board is needed
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Completed Tx Test Board – Take 2Completed Tx Test Board – Take 2
←←
Outputs
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Tx Test Board PerformanceTx Test Board Performance
0 dB
70 dB
10 dB
● PRBS7 Pattern
● 3 minute interval
● BER < 10^-9 (For > 0 dB)
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Tx Test Board PerformanceTx Test Board Performance(Continued)(Continued)
● 70 db
● AC coupled
● 70 db
● Scaled down using potentiometer
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Tx Test Board (Take 2) Conclusions Tx Test Board (Take 2) Conclusions
• Eye diagrams are very well-defined
• Potentiometer scales the eye dramatically
• Attenuation has minimal affect on eye
• Low BER rate suggests quality performance
• The Three are capable of building a working Tx board!
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Tx & Rx SchematicsTx & Rx Schematics
TxTx
RxRx
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TxRx PCB LayoutTxRx PCB LayoutConservative Agressive
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Board 1A ConstructionBoard 1A Construction
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Board 1A TroubleshootingBoard 1A Troubleshooting
No Success with Tx or RxNo Success with Tx or Rx
High-Pitched Noise and a Smoking Ferrite High-Pitched Noise and a Smoking Ferrite Bead…Bead…
Short Discovered Between Power Supply Short Discovered Between Power Supply and Ground (Not from Layout)and Ground (Not from Layout)
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Board 1B ConstructionBoard 1B Construction
The Three’s Tried-and-True Strategy: Start OverThe Three’s Tried-and-True Strategy: Start Over
Results: Nothing Breaks During Testing!!!!!Results: Nothing Breaks During Testing!!!!!
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Board 1B TroubleshootingBoard 1B Troubleshooting
Receiver Circuit Functions PerfettoReceiver Circuit Functions Perfetto
Continuing Issues with TxContinuing Issues with Tx
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Rx Test SetupRx Test Setup
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Rx ResultsRx Results
PRBS7 PatternPRBS7 Pattern9 dB9 dBBER < 10^-11BER < 10^-115 minute duration5 minute durationProper operation verified!Proper operation verified!YayYay
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Board 1B Transmitter TestingBoard 1B Transmitter Testing
Left and Right Inputs to Left and Right Inputs to VCSELVCSEL
Signals Want to Be Signals Want to Be Eyes… Not Quite ThereEyes… Not Quite There
VCSEL Not LasingVCSEL Not Lasing
An Attempt at Board 1An Attempt at Board 1ΓΓ Tx Also UnsuccessfulTx Also Unsuccessful
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Aggressive Tx ModificationsAggressive Tx Modifications
Soldered all passives super carefully Soldered all passives super carefully
Used a 25k potentiometer to modulate IUsed a 25k potentiometer to modulate Ibias bias
instead of 1k potentiometerinstead of 1k potentiometer
Adjusted the VCSEL orientation for Adjusted the VCSEL orientation for forward-biasingforward-biasing
Adjusted pot values to safe levels before Adjusted pot values to safe levels before testingtesting
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Aggressive Tx Test SetupAggressive Tx Test Setup
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Aggressive Tx ProbingAggressive Tx ProbingLaser Driver Inputs Laser Driver Outputs
Data -
Data +
Data -
Data +
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Aggressive Tx ResultsAggressive Tx Results
LASING!!!!LASING!!!!
Adjusting IAdjusting Imodmod
and Iand Ibias bias
showed showed improved improved resultsresults
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Aggressive Tx Results (cont.)Aggressive Tx Results (cont.)
Working!!!!!!!!
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Loopback Testing Loopback Testing for Aggressive Designfor Aggressive Design
PRBS7 PatternPRBS7 Pattern
7 dB Attenuation7 dB Attenuation
Super YaySuper Yay
Too Good to Be Too Good to Be True? ….True? ….
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Not This Time!Not This Time!
Signal at 8 dB Signal at 8 dB Attenuation is Lower Attenuation is Lower Quality…As ExpectedQuality…As Expected
BER < 0.0E-10BER < 0.0E-10
Removal of an Optical Removal of an Optical Fiber Produces a Lost Fiber Produces a Lost SignalSignal
Verified Successful Verified Successful Completion of Gigabit Completion of Gigabit Ethernet Ethernet
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Final BudgetFinal BudgetItem Supplier Part # Qty Unit Price Total Amount
Ferrite Chip Inductor Digikey 490-1034-1-ND 30 $ 0.12 $ 3.60
Power Jack Digikey CP-002APJCT-ND 5 $ 0.81 $ 4.05
POT 1.0kOhm Digikey 3296W-102-ND 5 $ 2.50 $ 12.50
POT 25kOhm Digikey 3296W-253-ND 5 $ 2.50 $ 12.50
Resistor 115 Ohm Digikey 311-115CCT-ND 10 $ 0.08 $ 0.80
Resistor 100 Ohm Digikey 311-100CCT-ND 10 $ 0.08 $ 0.80
Resistor 24 Ohm Digikey RR12Q24DCT-ND 10 $ 0.15 $ 1.51
Resistor 10 Ohm Digikey RR12Q10DCT-ND 10 $ 0.15 $ 1.51
Capacitor 10000 pF Digikey PCC103BNCT-ND 100 $ 0.04 $ 3.66
SMAs Jameco 901-143-6RFX 10 $ 4.20 $ 42.00
2.5 Gbps ROSA Advanced Optical Components HFD3180-103 4 $ 10.00 $ 40.00
2.5 Gbps VCSEL Advanced Optical Components HFE419x-541 4 $ 14.50 $ 58.00
PCB Board Fab Express PCB 1 $ 59.00 $ 59.00
Shipping and Miscellaneous Various $ 25.94
Total $ 265.87
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Bill of MaterialsBill of Materials
Product Vendor Item Number Qty Large Qty Price ($) Total Amount ($)
POT 25.0K OHM Digikey 3296W-253-ND 2 1.092 2.184
RES 115 OHM Digikey 311-115CCT-ND 2 0.01682 0.03364
RES 100 OHM Digikey 311-100CCT-ND 2 0.01682 0.03364
RES 24 OHM Digikey RR12Q24DCT-ND 1 0.02958 0.02958
RES 10 OHM Digikey RR12Q10DCT-ND 1 0.02958 0.02958
CAP 10000 PF Digikey PCC103BNCT-ND 18 0.01888 0.33984
CONN PWR JACK Digikey CP-002APJ-ND 1 0.40338 0.40338
Ferrite Bead Inductor Digikey 490-1034-1-ND 3 0.064 0.192
VCSEL AOC HFE419x-541 1 7.25 7.25
ROSA AOC HFD3180-103 1 5.00 5.00
Laser Driver Chip Maxim MAX3287 1 4.00 4.00
Limiting Amplifier Chip Maxim MAX3264 1 4.00 4.00
PCB Board Express PCB 4 Layer Board 1 5.7195 5.7195
Total $ 29.22
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Final GANTTFinal GANTT
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The Three – Pratt Worthy!The Three – Pratt Worthy!