ECE 135 – The Three Presentation 8 Pat Cleary with Kevin Parker & Bryan Chavez March 24 th, 2005 March 24 th, 2005.

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Presentation transcript:

ECE 135 – The Three Presentation 8 Pat Cleary with Kevin Parker & Bryan Chavez March 24 th, 2005 March 24 th, 2005

Work Summary Received Passives and SMA Connectors Updated Budget Corrected Bill of Materials Soldered and Tested Board 1 Board 1 Troubleshooting Began Midterm Paper

GANTT Chart

Project Budget ItemSupplierPart #QtyUnit PriceTotal Amount Ferrite Chip InductorDigikey ND30 $ 0.12 $ 3.60 Power JackDigikeyCP-002APJCT-ND5 $ 0.81 $ 4.05 POT 1.0kOhmDigikey3296W-102-ND5 $ 2.50 $ POT 25kOhmDigikey3296W-253-ND5 $ 2.50 $ Resistor 115 OhmDigikey CCT-ND10 $ 0.08 $ 0.80 Resistor 100 OhmDigikey CCT-ND10 $ 0.08 $ 0.80 Resistor 24 OhmDigikeyRR12Q24DCT-ND10 $ 0.15 $ 1.51 Resistor 10 OhmDigikeyRR12Q10DCT-ND10 $ 0.15 $ 1.51 Capacitor pFDigikeyPCC103BNCT-ND100 $ 0.04 $ 3.66 SMAsJameco RFX10 $ 4.20 $ Gbps ROSAAdvanced Optical ComponentsHFD $ $ Gbps VCSELAdvanced Optical ComponentsHFE419x-5414 $ $ PCB Board FabExpress PCB 2 $ $ Shipping and MiscellaneousVarious $ Total $

Corrected Bill Of Materials ProductVendorItem NumberQtyLarge Qty Price ($)Total Amount ($) POT 1.0K OHMDigikey3296W-102-ND POT 25.0K OHMDigikey3296W-253-ND RES 115 OHMDigikey CCT-ND RES 100 OHMDigikey CCT-ND RES 24 OHMDigikeyRR12Q24DCT-ND RES 10 OHMDigikeyRR12Q10DCT-ND CAP PFDigikeyPCC103BNCT-ND CONN PWR JACKDigikeyCP-002APJ-ND Ferrite Bead InductorDigikey ND VCSELAOCHFE419x ROSAAOCHFD Laser Driver ChipMaximMAX Limiting Amplifier ChipMaximMAX PCB BoardExpress PCB4 Layer Board Total $ 29.34

Board 1 Construction

Initial Board 1 Troubleshooting No Success with Tx or Rx High-Pitched Noise and a Smoking Ferrite Bead…Good? (We’re Thinking No) Short Discovered Between Power Supply and Ground (Not from Layout) Power Supply Questions

Board 1 Construction – Take 2 The Three’s Tried-and-True Strategy: Start Over Results: Nothing Breaks During Testing!!!!!

Transmitter Testing Left and Right Inputs to VCSEL Signals Want to Be Eyes… Not Quite There VCSEL Not Lasing

Receiver Testing ROSA Output is Desirable Eye No Output From Limiting Amplifier Limiting Amplifier Extremely Hot at First

Troubleshooting Conclusions Disastrous First Attempt at Board 1 No Shorts in Current Board Problem Could be a Design Issue or a Component Problem Possible Theory for Receiver: Maxim Chip Overheated and is Toast?

Future Work Finish Midterm Report Continue Troubleshooting Board 1 Purchase Rabbit’s Foot Avoid Ladders and Black Cats Pray