E-Cal Readout Boards - 8 Boards total -Design & Fabrication at Jlab - Assembly at Orsay Nick Nganga HPS Collaboration Oct Jlab
MotherBoard Each Signal trace has Ground guard traces Signal trace 8mil space 8 mil Stackup verified in BoardSim Crosstalk simulated for longest traces **Board layers for Full Experiment. 4 Boards (2-Identical) 16- layers 6 signal layers 2 High Voltage 2 Low Voltage 6 Ground Nick Nganga HPS Collaboration Oct Jlab
Amplifier Connections 1.GND (2 pins) 2.High Voltage (1 Pin) APD Connections (2 pins) 1.Anode 2.Cathode Connection Boards 4 Boards (2 similar) 2 Layers 2 Connectors (No traces) Nick Nganga HPS Collaboration Oct Jlab
Ecal Grouping Each grouping requires its own High Voltage Connection Nick Nganga HPS Collaboration Oct Jlab
SI - Simulation Characteristic Amplifier Output (DVCS 2005) Tested on Longest Trace ~ 22inches Equivalent to 4ns prop. delay. Longest Trace Highlighted for Signal Integrity Analysis Nick Nganga HPS Collaboration Oct Jlab
Simulation Setup: CMOS Driver with 0.8V/ns slew rate. Termination: 50-ohm. Result: Less than 2% reflection (40mV on 2V scale) Nick Nganga HPS Collaboration Oct Jlab
Crosstalk Threshold set to 15mV (only one trace affected) Crosstalk Threshold set to 20mV (Two traces affected) CROSSTALK SIMULATION Nick Nganga HPS Collaboration Oct Jlab
Board Status (design) Connection Boards ~1.5 Days – Bottom Right ~0.5 days – Top Right ~ 0.5 days – Bottom Left, Top Left ~ 0.5-day MotherBoards ~2.5 Days – Bottom Right ~1 day – Top Right ~ 1 days – Bottom Left, Top Left ~ 0.5-days Nick Nganga HPS Collaboration Oct Jlab