ECE 135 Final Presentation The Three … aka Pat Cleary with Kevin Parker & Bryan Chavez April 21 st, 2005 April 21 st, 2005

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


The VCSEL Kings … akaThe VCSEL Kings … aka




RIO! … akaRIO! … aka




BtrLaytDanNvr BtrLaytDanNvr



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.

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

Background Research: OverviewBackground Research: Overview

Background Research: TxBackground Research: Tx

Background Research: RxBackground Research: Rx

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

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




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

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

Additional VCSEL PurchaseAdditional VCSEL Purchase

LC-TOSA

• 20 Free VCSELs Obtained

Introduction to Test EquipmentIntroduction to Test Equipment

Introduction to Test EquipmentIntroduction to Test Equipment

Tx Test Board Construction …Tx Test Board Construction …

… … And Immediate CorrectionAnd Immediate Correction

• Soldered Output Pins in Correct Locations

Tx Test Board PerformanceTx Test Board Performance

““Best” Eye DiagramBest” Eye Diagram

PRBS7 PatternPRBS7 Pattern

Troubleshooting Troubleshooting NecessaryNecessary

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!

More Tx Test Board WorkMore Tx Test Board Work

Tx Test Board Quality ControlTx Test Board Quality Control

Input in InputInput in Input

Output in OutputOutput in Output


No attenuationNo attenuation


Still not successful

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

Completed Tx Test Board – Take 2Completed Tx Test Board – Take 2

←←

Outputs


0 dB

70 dB

10 dB

● PRBS7 Pattern

● 3 minute interval

● BER < 10^-9 (For > 0 dB)

Tx Test Board PerformanceTx Test Board Performance(Continued)(Continued)

● 70 db

● AC coupled

● 70 db

● Scaled down using potentiometer

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!

Tx & Rx SchematicsTx & Rx Schematics

TxTx

RxRx

TxRx PCB LayoutTxRx PCB LayoutConservative Agressive

Board 1A ConstructionBoard 1A Construction

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)

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!!!!!

Board 1B TroubleshootingBoard 1B Troubleshooting

Receiver Circuit Functions PerfettoReceiver Circuit Functions Perfetto

Continuing Issues with TxContinuing Issues with Tx

Rx Test SetupRx Test Setup

Rx ResultsRx Results

PRBS7 PatternPRBS7 Pattern9 dB9 dBBER < 10^-11BER < 10^-115 minute duration5 minute durationProper operation verified!Proper operation verified!YayYay

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

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

Aggressive Tx Test SetupAggressive Tx Test Setup

Aggressive Tx ProbingAggressive Tx ProbingLaser Driver Inputs Laser Driver Outputs

Data -

Data +

Data -

Data +

Aggressive Tx ResultsAggressive Tx Results

LASING!!!!LASING!!!!

Adjusting IAdjusting Imodmod

and Iand Ibias bias

showed showed improved improved resultsresults

Aggressive Tx Results (cont.)Aggressive Tx Results (cont.)

Working!!!!!!!!

Loopback Testing Loopback Testing for Aggressive Designfor Aggressive Design


7 dB Attenuation7 dB Attenuation

Super YaySuper Yay

Too Good to Be Too Good to Be True? ….True? ….

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

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

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

Final GANTTFinal GANTT

The Three – Pratt Worthy!The Three – Pratt Worthy!

Documents

ECE 135 Final Presentation The Three … aka Pat Cleary with Kevin Parker & Bryan Chavez April 21 st, 2005 April 21 st, 2005