Gigabit%20Ethernet%20TxRx

1
Gigabit Ethernet TxRx
ECE164.02 Group 2 Presentation 4
Andrew Tupper
February 26, 2004
2
Gigabit Ethernet
Summary 2/19-2/26

• Current Completed Tasks
• Fix Test Rx Test Board
• Build Tx Test Board
• Contact Vendors of VCSELs PDs
• Tx Rx Schematic Diagrams
• Begin PCB Design
• Revise Gantt Chart

• Upcoming Tasks
• Complete PCB Design
• Order PCBs
• Complete Test Tx Test Board

Group 2 Presentation 4
February 26, 2004
3
Gigabit Ethernet
Rx Test Board

• Initial problem caused by faulty power connection

• No recognizable signal

Group 2 Presentation 4
February 26, 2004
4
Gigabit Ethernet
Rx Test Board

• Replaced power connectors with correct, on-chip
  style connectors

• Rx test board works!

Group 2 Presentation 4
February 26, 2004
5
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 0dB attenuation
• 1 minute B.E.R. of 2.8E-08
• Receiver is overdriven

Group 2 Presentation 4
February 26, 2004
6
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 10dB attenuation
• 1 minute B.E.R. of 0.0E-9

Group 2 Presentation 4
February 26, 2004
7
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 20dB attenuation
• 1 minute B.E.R. of 0.0E-9

Group 2 Presentation 4
February 26, 2004
8
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 30dB attenuation
• 1 minute B.E.R. of 0.0E-9

Group 2 Presentation 4
February 26, 2004
9
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 40dB attenuation
• 1 minute B.E.R. of 0.0E-9

Group 2 Presentation 4
February 26, 2004
10
Gigabit Ethernet
Rx Test Board

• Scope set to 2 second persistence
• 50dB attenuation
• 1 minute B.E.R. of 2.2E-1
• Signal Loss
• B.E.R. becomes unacceptable at 42dB attenuation

Group 2 Presentation 4
February 26, 2004
11
Gigabit Ethernet
Tx Test Board

• Completely assembled Tx test board, excluding SMA
  outputs

Group 2 Presentation 4
February 26, 2004
12
Gigabit Ethernet
Tx Test Board

• Tx outputs are shorted to ground!
• Waiting on engraver to complete assembly

Group 2 Presentation 4
February 26, 2004
13
Gigabit Ethernet
PDs VCSELs

• Secured sample HFE438x-522 VCSEL from Honeywell
• Difficulty contacting Luxnet in search of VG1A
  9001 VCSEL
• In contact with OSI and Hamamatsu for PDs may
  have to collaborate with group 1 to meet minimum
  order requiremetns

Group 2 Presentation 4
February 26, 2004
14
Gigabit Ethernet
Rx Schematic

• Generated Rx schematic in ExpressSCH

Group 2 Presentation 4
February 26, 2004
15
Gigabit Ethernet
Tx Schematic

• Generated Tx schematic in ExpressSCH

Group 2 Presentation 4
February 26, 2004
16
Gigabit Ethernet
PCB Layout

• Began board layout with ExpressPCB
• Waiting on final approval of schematics before
  moving ahead with PCB layout

Group 2 Presentation 4
February 26, 2004
17
PCB Layout
Gigabit Ethernet