1. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 1 PCB with 256 RPCs pads (Status) IPNL - LAL - LLR

2. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 2 PCB 256 RPCs pads Status 1.3 PCBs with all components 2.1 PCB without components used to test the pcb Xtalk 3.encountered problems

3. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 3 Dig Part64 Pads 1 32 PCB Gnd Generator Scope Shield Xtalk measurements - Setup 64 Pads Small Probe 10µm diameter

4. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 4 Xtalk measurements - Setup

5. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 5 PCB 8 Layers : 2 face to face paths (2 layers) Hardroc Pin 2-7 (50 Ohms to GND) Pad 21-24 Input on Rpc Pad = 2V Measure = 3.2 mV Xtalk = 0.16% Input Measure Average of Measure Xtalk measurements

6. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 6 6 layers 8 layers same layer 2 diff layers Coupling Cap 50 fF/cm 120 fF/cm 120fF/cm to 1pF/cm Xtalk 0.3 % 0.4% 0.3% gnd h d w h=50µm,w=200µm,d=330µm C = 50 fF/cm gnd h d w h=200µm,w=200µm,d=330µm C = 120fF/cm gnd h h=100µm,w=200µm w Measurements results depends on shield connection Difficult to conclude what configuration is the best Xtalk < 0.5% Xtalk measurements - Conclusion

7. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 7 Board with components

8. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 8 Encountered Problems 1 board in test 2 HardRoc in short circuit on Analog Power Supplies :  need to be changed  40 mA/HardRoc Problems with Xilinx power supplies (tps75003) :  Need to add external voltage regulators Foot print problems with USB interface circuit :  Need to do manual connection ! SOLVED Xilinx I/O problems :  Need to add wire and change VHDL code TO BE SOLVED

9. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 9 Conclusion 1.2 PCB in Fab (return from Fab next week) 2.After a fully debugging of the first board modified 2 another boards launch 3 last pcb to solder components first tests with 1 RPC connected

10. Hervé MATHEZ IPNL CALICE Meeting CERN 12 –07-07 10 Conclusion