Transcript Slides - Indico LAL

PCB with
256 RPCs
pads
(Status)
IPNL - LAL - LLR
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
1
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
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
2
Xtalk measurements - Setup
Dig Part
64 Pads
64 Pads
64 Pads
32
1
Small Probe
10µm diameter
PCB
Gnd
64 Pads
Generator
Shield
Shield
Scope
Gnd
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
3
Xtalk measurements - Setup
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
4
Xtalk measurements
Input
Measure
Average
of Measure
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
Xtalk = 0.16%
Measure = 3.2 mV
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
5
Xtalk measurements - Conclusion
6 layers
Coupling Cap
Xtalk
50 fF/cm
8 layers
same layer
120 fF/cm
0.3 %
h
w
h=50µm,w=200µm,d=330µm
C = 50 fF/cm
0.3%
d
gnd
gnd
120fF/cm to 1pF/cm
0.4%
d
2 diff layers
gnd
gnd
gnd
h
w
h
h=200µm ,w=200µm,d=330µm
w
C = 120fF/cm
h=100µm,w=200µm
Measurements results depends on shield connection
Difficult to conclude what configuration is the best
Xtalk < 0.5%
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
gnd
6
Board with components
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
7
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 !
Xilinx I/O problems :
 Need to add wire and change VHDL code
TO BE SOLVED
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
8
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
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
9
Conclusion
Hervé MATHEZ
IPNL CALICE Meeting CERN 12 –07-07
10