Project GabE ECE 135 – Spring 2005 Final Presentation
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Transcript of Project GabE ECE 135 – Spring 2005 Final Presentation
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%
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93%
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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