Project GabEECE 135 – Spring 2005

Final Presentation

Omar Al-JaddaPatrick CrosbyAdam DurityRahmin Sarabi

Progress Report

Built final board design

Tested and verified Tx

Tested and verified Rx

Loopback Testing

Gantt ChartID Task Name Start Finish % Complete

1 Background Research Wed 1.12.05 Wed 4.27.05 100%

2 IEEE 802.3 Standard Tue 1.18.05 Fri 1.28.05 100%

3 VCSELs and PDs Mon 1.24.05 Mon 1.31.05 100%

4 Miscellaneous Wed 1.12.05 Wed 4.27.05 100%

5 Test Eval Board Tue 1.25.05 Mon 1.31.05 100%

6 Build & Test Practice Board Tue 2.1.05 Tue 2.8.05 100%

7 Optical Link Budget Mon 1.24.05 Thu 2.10.05 100%

8 Choose Components Mon 1.31.05 Mon 2.7.05 100%

9 Order Parts Mon 2.7.05 Mon 3.7.05 100%

10 Order VCSELs and PDs Mon 2.7.05 Fri 2.11.05 100%

11 Order Other Parts Mon 2.21.05 Mon 3.7.05 100%

12 Schematics Fri 2.11.05 Wed 2.23.05 100%

13 PCB Mon 2.14.05 Mon 3.21.05 100%

14 Design Mon 2.14.05 Fri 3.11.05 100%

15 Design Review Mon 2.21.05 Fri 3.11.05 100%

16 Order Mon 3.14.05 Mon 3.21.05 100%

17 Midterm Report Mon 2.28.05 Fri 3.25.05 100%

18 Board 1 Mon 3.21.05 Mon 4.4.05 100%

19 Construct Board Mon 3.21.05 Wed 3.23.05 100%

20 Test Board Thu 3.24.05 Mon 4.4.05 100%

21 Board 2 Mon 4.4.05 Tue 4.26.05 93%

22 Design Modifications Mon 4.4.05 Thu 4.14.05 100%

23 Construct Board Fri 4.15.05 Tue 4.19.05 100%

24 Test Board Wed 4.20.05 Tue 4.26.05 75%

25 Final Report Mon 4.18.05 Wed 4.27.05 50%

26 Midterm Exam Tue 2.22.05 Tue 2.22.05 100%

27 Midterm Report Fri 3.25.05 Fri 3.25.05 100%

28 Final Report Wed 4.27.05 Wed 4.27.05 0%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

100%

93%

100%

100%

75%

50%

2.22

3.25

4.27

9 16 23 30 6 13 20 27 6 13 20 27 3 10 17 24 1 8 15 22Jan '05 Feb '05 Mar '05 Apr '05 May '05

Project Overview

Research 802.3 Gigabit Ethernet standard

Learn to use the test equipmentAnalyze and select optical

components to be usedDesign and build both an aggressive

and a conservative prototype of a 1.25Gbps Optical Gigabit Ethernet PMD

Evaluation Board Tested MAX3287,

MAX3266, MAX3264 evaluation boards

Varied attenuation from 0dB down to 70dB

BER = 10^-9 @ 10dB

Test Board Built test board using

parts provided Tested board at 10dB

and 30dB BER = 10^-9 @ 10dB

VCSEL

Criteria for selecting VCSEL: High slope efficiency Low threshold current At least 1.25Gbps

We chose the Advanced Optical Components HFE4191-541

ROSA

Criteria for selecting ROSA: High responsivity High transimpedance

We selected the Advanced Optical Components HFD3180-102

GabE Final Schematic - Tx

GabE Final Schematic - Rx

Conservative Board Designs

GabE 1.0 GabE 2.0

Aggressive Board Designs

GabE 1.0 GabE 2.0

Aggressive vs. Conservative

Conservative is designed with one key objective in mind: functionality

Aggressive design achieves LC connector spacing

Aggressive design violates many design rules: asymmetric, long traces

GabE 2.0Conservative Aggressive

Conservative Board “Plug ‘n’ Play” Required no additional

fiddling Basis for Tx, Rx, and

loop-back tests

Aggressive Board TOSA-ROSA Distance

meets LC Specification After build; did not work

right away Blew an inductor; smoke

etc… Short to ground Separated Tx and Rx Tried to isolate short

Aggressive Board Discovered that Tx chip

was cause of short! Also destroyed a pin on

the LA; used wire jumper Soldered on a new Tx

Chip No short to ground Still does not work

Board Building Tips from Ωr Solder chips on first, carefully, and check

the notch! Solder on smaller passives then larger

components, TOSA/ROSA last Fine tipped soldering iron at 650°F; high

gauge solder Use needle nose pliers to hold in place the

SMT component; touch the soldering iron to the solder to form a bead, solder joint

Tx Testing - Conservative Attempted to tune

potentiometers, but found that they have little to no effect

Tested Circuit for 10, 20, 30, 50 and 70dB of attenuation

Tx Testing - Conservative

10dB High Rbias, High Rmod 10dB High Rbias, Low Rmod

10dB Low Rbias, High Rmod10dB Low Rbias, Low Rmod

Tx Testing - Conservative

10dBRbias = 500Ω, Rmod = 12.5kΩ

Tx Testing - Conservative

30dBRbias = 500Ω, Rmod = 12.5kΩ

Tx Testing - Conservative

70dBRbias = 500Ω, Rmod = 12.5kΩ

Tx Testing - Aggressive 1.0

0dB/810ohm

Tx Testing - Aggressive 2.0

Aggressive Board

Possible Problems Broken pin on

Maxim Chip Burned Inductor Burned out traces Soldering problems

Rx Testing - Conservative

0dB

4dB

Rx Testing - Conservative

7dB

12dB

Loopback - Conservative Based on Tx

Testing, set Rbias and Rmod to 500Ω 12.5k Ω respectively

Tested with 10 and 70dB electrical attenuation and 0 and 9dB optical attenuation

Loopback - Conservative

10dB Electrical0dB Optical

Rbias = 500Ω, Rmod = 12.5kΩ

Loopback – Conservative

70dB Electrical9dB Optical

Rbias = 500Ω, Rmod = 12.5kΩ

Bit Error Rate Tests Loopback

Electrical: 70dB; Optical: 9dB;BER=10^-10

Electrical: 10dB; Optical: 9dB;BER=10^-10

Receiver Optical: 12dB;

BER=10^-10 Transmitter

Electrical: 70dB;BER=10^-10

Financial BudgetVendor Description Quantity Item Number Unit

Price Amount

Digikey Power Connector 1 CP-002AHPJ-CT 0.900$ 0.90$ Digikey CAP 10000PF 100 PCC103BNCT-ND 0.054$ 5.40$ Digikey RES 100 OHM 1/8W 30 311-100CCT-ND 0.080$ 2.40$ Digikey RES 169 OHM 1/8W 30 311-169CCT-ND 0.080$ 2.40$ Digikey RES 24 OHM 1/10W 30 RR12Q24DCT-ND 0.140$ 4.20$ Digikey RES 2.7K OHM 1/8W 10 311-2.70KCCT-ND 0.080$ 0.80$ Digikey POT 1.0K OHM 3/8” 5 3296W-102-ND 2.500$ 12.50$ Digikey POT 25K OHM 3/8” 5 3296W-253-ND 2.500$ 12.50$ AOC VCSEL 4 HFE4191-541 14.500$ 58.00$ AOC ROSA 4 HFD3180-102 10.000$ 40.00$ Jameco SMA Connectors 10 901-143-6RFX 3.450$ 34.50$ Express PCB PCB 6 Custom 17.000$ 102.00$ Mouser Murata Inductors 10 81-BLM11HA102SG 0.130$ 1.30$ Digikey Murata Inductors 50 490-1034-1-ND 0.104$ 5.20$ Shipping Cost 36.83$

TOTAL: 318.93$

Bill of MaterialsVendor Description Quantity Item Number Unit

Price 100k Price

Digikey Power Connector 1 CP-002AHPJ-CT 0.900$ 0.900$ Digikey CAP 10000PF 17 PCC103BNCT-ND 0.054$ 0.016$ Digikey RES 100 OHM 1/8W 3 311-100CCT-ND 0.080$ 0.017$ Digikey RES 169 OHM 1/8W 1 311-169CCT-ND 0.080$ 0.017$ Digikey RES 24 OHM 1/10W 10 RR12Q24DCT-ND 0.140$ 0.030$ Digikey RES 2.7K OHM 1/8W 1 311-2.70KCCT-ND 0.080$ 0.017$ Digikey POT 1.0K OHM 3/8” 1 3296W-102-ND 2.500$ 1.092$ Digikey POT 25K OHM 3/8” 1 3296W-253-ND 2.500$ 1.092$ Maxim Laser Driver 1 MAX3287 4.430$ 4.000$ Maxim Limiting Amplifier 1 MAX3264 4.430$ 4.000$ AOC VCSEL 1 HFE4191-541 14.500$ 5.800$ AOC ROSA 1 HFD3180-102 10.000$ 4.000$ Express PCB PCB 1 Custom 17.000$ 3.060$ Mouser Murata Inductors 7 81-BLM11HA102SG 0.130$ 0.042$

TOTAL: 59.89$ 24.89$

Upcoming Week

Complete Final Report

Conclusion ROSA – the solution to the crosstalk

problem ROSA – allows prices to be competative

with electrical GbE Learned skills in project management: Gantt

charts, working with vendors, how to work as a team, allocation of time and resources