Download Hybrid Front-end board

Status of LAV FEE electronics
G. Corradi, C. Paglia, D. Tagnani
&
M. Raggi, T. Spadaro, P. Valente
Front-end board (scheme)
Supply control
± 6V
± 12 V
CPU
Power
supply
CAN-Open
DAC
ADC
Trigger in
Test
pulse
Threshold control
• 32 FEE channels
• Fits on mechanics
VME 9U
• Include services:
Analog in
Final board
• Analog sums
• Remote threshold
• Individual channel
threshold control
• Pulsing system
LVDS out
LVDS driver
LVDS out
Pre-amplifier stage
Dual thr. Discriminator
& shaper
Analog sum
Analog sum
out
Hybrid Front-end board
Prototype board
This is the prototype used in the
beam test.
The design of this board is
based:
• 4 “ToT Mezzanine” with 2 channels each
• This is the final card.
•2 Manual threshold control
• thr low
• thr high
• 2 Analog output SUM
• 16 LVDS output (8CHx2thr)
• Fits on mechanics VME6U.
ToT Mezzanine
This is the Time Over Threshold
Mezzanine card.
It has the section of:
• Clamping
• Amplification and Splitter
• 2 channels of Discrimination.
BOTTOM VIEW
TOP VIEW
Analog sum output
• The Front End board is equipped with 32 analog channels
• One board is used for 1 LAYER.
• All outputs can not be housed in the board (there isn’t space on
the front panel)
Is possible carry out:
4Ch
4Ch
• 1 SUM with 4 analog signals
(One for each “BANANA”)
• 1 SUM with 4 BANANAs
(One for each half Layer)
4Ch
4Ch
sum 4 sum 4
•The final motherboard will contains:
• 8 SUM output with 4 channels.
• 2 SUM output with 16 channels.
sum 4
16Ch
sum 16
Su
• All SUMs must be clamped, because the sum
of analog signal must not saturate the amplifier.
• All SUMs must be buffered and matched 50Ω.
Something like this…
• This is a shot of what we are
willing to have for the final
version.
• The small cards at the bottom are
“ToT Mezzanine”.
• The small cards at the top are
“SUM Mezzanine”.
• On the front panel fitted:
• LVDS output for TDC
• SUM output
• Slow control connection.
• On the rear panel fitted:
• Analog input
• Power connector.
Threshold circuit
• The threshold will be read and programmed
remotely. (CANOpen)
• With a dynamic range 0-500 mV
• With a resolution 12 bits
• With stability 2 LSB
• Will be implemented the automatic threshold scan
via slow control.
Front-end diagnostics
• For test the Front-end system, the board implements
a TEST PULSE, which may be:
• free-running (controlled by local CPU)
• or on external trigger
• The pulse can be:
• equal for all channels
• or a programmable pattern
• The pulse can be programmed in level and in width:
• 10-500 mV programmable amplitude
• 10-50 ns programmable width
• Stability level 1%.
DCS requirements FEE boards
• The structure of our slow control system
consists of 4 CAN line :
• 1 for Crate VME9U
• 1 for Tell62
• 1 for HV system
• 1 for 8 Front End board
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DCS requirements FEE boards
1) VME 9U crate Monitoring
Items
Reading cycle per
Status ON/OFF/Error
30 sec or even more
Voltages/currents
30 sec or even more
Crate temperature
30 sec or even more
Fan Speed
30 sec or even more
Actions: ON/OFF/Rest communication
2) TELL1 Monitoring (Ask Marco Sozzi)
3) HV Monitoring (to be defined)
4) FEE Monitoring dedicated CAN-Open line (8 boards)
Monitoring Items:
Reading cycle per
Status ON/OFF/Error
30 sec or even more
Voltages
30 sec or even more
Boards temperature
30 sec or even more
Thresholds (2x32 ch L/H)
30 sec or even more
Actions:
N channels
Set threshold value
(2x32 ch L/H)
Set test pulse signal
10
CRATE LAV
In order to start the production of the final project
some information are still missing.
We are trying to understand the right information of:
• the power supply of the crates
• the voltages supply (analog and digital) for slot
• the maximum current for slot
• the backplane connector schema
Until we obtain these info we can not finalize the
design.
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Wiener 6020 LHC crate
This is an example of a crate that has been taken into account,
but it has a deficit in current on the 12V;
Wiener 6021 LHCb TELL1 crate
10A
5V
±5V
5A
5A
NO
0.5A
This is another example of a crate, but it has not 12V;
• Both crates are not suitable for our purposes!
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CRATE LAV (survey questions)
• This table shows the voltage and current that we estimate for
the LAV station:
•
Volt
1 Tell62
1 FEE
+3.3V
1 LED
+5V
+5Vstd
+12V
-12V
+ 48V
PW
0.5A
2A
2A
50W/slot
0.5A
2A
2A
0.2A 60W/slot
We don’t know the final consumption of TELL62 (Marco Sozzi will tell us the truth)
• For each LAV’s Crate we need 1 TELL62 slot (mechanical 2 slots)
and 19 VME 9U slots with only upper power connector.
• We request only mechanical slot 9U, and 3U for backplane and
power supply.
• We don’t need the transition modules.
Only J1 connector
9U x 240mm
3U
Module
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Conclusion
• Beginning of final project waits results from the test beam
– Time resolution
– Charge resolution
– Interaction with TELL1 and final TDC
• Design of components for the final board done
– Mother board design after definition of power supply (crate)
– Need final output connection to TDC to be defined
• DCS requires 4 lines per stations
– Crate VME, TELL62, FEE board, HV
NOTA A
CRATE LAV
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