Task List

1
Task List

• Group management plan
• Background studies
• Link budget optical/electrical
• Build, test learning Rx board
• Order components for transceiver (TxRx) module
• Design, circuit schematic, layout of full duplex
  TxRx module (Run 1)
• Build, test transceiver module, Run 1
• Alignment tolerance of Rx on TxRx module, Run 1
• Analysis of results, Run 1
• Design, circuit schematic, layout of full duplex
  TxRx module (Run 2, optional)
• Build, test transceiver module (Run 2, optional)
• Alignment tolerance of Rx on TxRx module (Run 2,
  optional)
• Analysis of results (Run 2, optional)

2
Gigabit Receiver Board

• ECE 4006

Power
passives
CML (Current mode logic)
Light Signal
Limiting Amp
TIA
3
Receiver components

• TIA (transimpedance Amplifier)
• Amplifies small PD (photodiode) current
• Low noise
• Low input impedance (600 Ohms)
• Converts current to voltage
• Limiting Amplifier
• Boosts TIA output voltage 30mV to gt100mV
• Converts analog to digital (limiting) CML

4
TIA - MAX3266
5
Limiting Amplifier MAX3264
6
On Board Passives
Supply Decoupling
DC Bias
AC coupling
AC coupling
AC coupling
Input Impedance Match
Supply Decoupling
7
Board Layout
J2
J1
J3

• Short lines
• 45 degree angles

8
Final Soldered Receiver PCB