Transcript ECE 4006B Fall, 2002 Group Gx, Your Name Progress Report

ECE 4006B Fall 2002, Ye Olde Groupe 6, John Covey
Final Progress Report (11-27 to 12-5)
Final Progress:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Successfully performed conectorized Rx testing
Performed unconnectorized Rx & Tx testing
Destroyed connectorized PD
Debugged Rx and Tx boards
Found more errors in layout
Finished 2nd layout
Halted soldering until new boards arrived
He was a good PD, and those who knew him, loved him
Received 2nd batch of PCBs
Assembled and tested new Rx & Tx boards (Especially Nilay)
Calculated correct Pot values
Destroyed 2 more PDs
Received VCSEL from Group 7 and Maxim 3287 from Group 1
Must have fried Maxim 3287 and probably fried one VCSEL
Failed to receive unconnectorized signals
Wrote a long report explaining our catastrophes
Set our hair on fire one last time
The Renaissance Electroptical Board
The Resulting Eyes for Connectorized PD
PRBS7
Why is there jitter? There are 824729358 reasons.
I can’t believe this worked at all.
K28.5
Old Layout
90 degree input
Vcc to
pin 10,
not 11
New Layout
Last Rx board
Tried 3 PDs, 3 boards, 3 Maxim 3264s, 3 Maxim 3266s,
6 power connectors, and 5 SMA connectors (not including Electroptical board)
Last Tx board
Used 50Ω resistor to measure current before using new boards, adjusted to 6mA
Used 2 Laser driver chips, 2 VCSELs, 3 Boards, 4 pots, 3 power connectors,
and 3 SMA connectors
Pot Values:
Rbias=800 - 3.3kΩ
Rmod=10k – 38k Ω
Signal results from last boards
…self explanatory
Why????
•
1st Maxim 3287 could have died from powering wrong pin
•
•
•
•
•
•
•
•
•
•
•
•
2nd Maxim 3287 is dead, Jim
90 degree angle still in newest Tx layout
Modified first boards too much (drilling, soldering traces, using staple, replaced everything)
Corrected everything with solder traces
Always used at least 750 C when soldering
Very rough when replacing parts
Filled 66% of all VCSEL/PD pins with solder
Power/GND problems could have destroyed parts
Scratched one unconnectorized PD
Never tested fibers before using
Powered VCSELs and PDs with incorrect orientations several times
Honeywell/DigiKey/Optek/Advanced Photonix/FiberComm conspiracy to send us duds
•
Overall, we don’t know. We covered every problem at least once.
The Final Gantt Chart