Project GabE ECE 135 – Spring 2005 Final Presentation
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Transcript of Project GabE ECE 135 – Spring 2005 Final Presentation
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Project GabEECE 135 – Spring 2005
Final Presentation
Omar Al-JaddaPatrick CrosbyAdam DurityRahmin Sarabi
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Progress Report
Built final board design
Tested and verified Tx
Tested and verified Rx
Loopback Testing
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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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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
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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
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Evaluation Board Tested MAX3287,
MAX3266, MAX3264 evaluation boards
Varied attenuation from 0dB down to 70dB
BER = 10^-9 @ 10dB
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Test Board Built test board using
parts provided Tested board at 10dB
and 30dB BER = 10^-9 @ 10dB
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VCSEL
Criteria for selecting VCSEL: High slope efficiency Low threshold current At least 1.25Gbps
We chose the Advanced Optical Components HFE4191-541
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ROSA
Criteria for selecting ROSA: High responsivity High transimpedance
We selected the Advanced Optical Components HFD3180-102
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GabE Final Schematic - Tx
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GabE Final Schematic - Rx
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Conservative Board Designs
GabE 1.0 GabE 2.0
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Aggressive Board Designs
GabE 1.0 GabE 2.0
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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
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GabE 2.0Conservative Aggressive
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Conservative Board “Plug ‘n’ Play” Required no additional
fiddling Basis for Tx, Rx, and
loop-back tests
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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
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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
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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
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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
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Tx Testing - Conservative
10dB High Rbias, High Rmod 10dB High Rbias, Low Rmod
10dB Low Rbias, High Rmod10dB Low Rbias, Low Rmod
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Tx Testing - Conservative
10dBRbias = 500Ω, Rmod = 12.5kΩ
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Tx Testing - Conservative
30dBRbias = 500Ω, Rmod = 12.5kΩ
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Tx Testing - Conservative
70dBRbias = 500Ω, Rmod = 12.5kΩ
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Tx Testing - Aggressive 1.0
0dB/810ohm
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Tx Testing - Aggressive 2.0
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Aggressive Board
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Possible Problems Broken pin on
Maxim Chip Burned Inductor Burned out traces Soldering problems
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Rx Testing - Conservative
0dB
4dB
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Rx Testing - Conservative
7dB
12dB
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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
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Loopback - Conservative
10dB Electrical0dB Optical
Rbias = 500Ω, Rmod = 12.5kΩ
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Loopback – Conservative
70dB Electrical9dB Optical
Rbias = 500Ω, Rmod = 12.5kΩ
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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
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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$
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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$
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Upcoming Week
Complete Final Report
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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