Transcript Gigabit Receiver Board Design

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)
Gigabit Receiver Board
Power
ECE 4006
passives
Light Signal
TIA
Limiting Amp
CML
(Current
mode logic)
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 >100mV
– Converts analog to “digital” (limiting) CML
TIA - MAX3266
Limiting Amplifier – MAX3264
On Board Passives
Supply Decoupling
DC Bias
AC coupling
AC coupling
AC coupling
Input Impedance Match
Supply Decoupling
Board Layout
J2
J1
J3
• Short lines
• 45 degree angles
Final Soldered Receiver PCB
Gnd
Vcc