1. Project GabE ECE 135 – Spring 2005 Final Presentation Omar Al-Jadda Patrick Crosby Adam Durity Rahmin Sarabi

2. Progress Report Built final board design Tested and verified Tx Tested and verified Rx Loopback Testing

3. Gantt Chart

4. Project Overview Research 802.3 Gigabit Ethernet standard Learn to use the test equipment Analyze and select optical components to be used Design and build both an aggressive and a conservative prototype of a 1.25Gbps Optical Gigabit Ethernet PMD

5. Evaluation Board Tested MAX3287, MAX3266, MAX3264 evaluation boards Varied attenuation from 0dB down to 70dB BER = 10^-9 @ 10dB

6. Test Board Built test board using parts provided Tested board at 10dB and 30dB BER = 10^-9 @ 10dB

7. VCSEL Criteria for selecting VCSEL: High slope efficiency Low threshold current At least 1.25Gbps We chose the Advanced Optical Components HFE4191-541

8. ROSA Criteria for selecting ROSA: High responsivity High transimpedance We selected the Advanced Optical Components HFD3180-102

9. GabE Final Schematic - Tx

10. GabE Final Schematic - Rx

11. Conservative Board Designs GabE 1.0 GabE 2.0

12. Aggressive Board Designs GabE 1.0 GabE 2.0

13. 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

14. GabE 2.0 ConservativeAggressive

15. Conservative Board “Plug ‘n’ Play” Required no additional fiddling Basis for Tx, Rx, and loop-back tests

16. 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

17. 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

18. 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

19. 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

20. Tx Testing - Conservative 10dB High R bias, High R mod 10dB High R bias, Low R mod 10dB Low R bias, High R mod 10dB Low R bias, Low R mod

21. Tx Testing - Conservative 10dB R bias = 500Ω, R mod = 12.5kΩ

22. Tx Testing - Conservative 30dB R bias = 500Ω, R mod = 12.5kΩ

23. Tx Testing - Conservative 70dB R bias = 500Ω, R mod = 12.5kΩ

24. Tx Testing - Aggressive 1.0 0dB/810ohm

25. Tx Testing - Aggressive 2.0

26. Aggressive Board

27. Possible Problems Broken pin on Maxim Chip Burned Inductor Burned out traces Soldering problems

28. Rx Testing - Conservative 0dB 4dB

29. Rx Testing - Conservative 7dB 12dB

30. Loopback - Conservative Based on Tx Testing, set R bias and R mod to 500Ω 12.5k Ω respectively Tested with 10 and 70dB electrical attenuation and 0 and 9dB optical attenuation

31. Loopback - Conservative 10dB Electrical 0dB Optical R bias = 500Ω, R mod = 12.5kΩ

32. Loopback – Conservative 70dB Electrical 9dB Optical R bias = 500Ω, R mod = 12.5kΩ

33. 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

34. Financial Budget

35. Bill of Materials

36. Upcoming Week Complete Final Report

37. 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