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A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
M.G.Bagliesi (a), P.Maestro (a), P.S.Marrocchesi (a), M.Meucci (a), V.Millucci (a),
F.Morsani (b), R.Paoletti (a), F.Pilo (a), A.Scribano (a), N.Turini (a), G. Valle (a)
(a) University of Siena - INFN Gruppo Collegato, Italy
(b) Istituto Nazionale di Fisica Nucleare INFN - Pisa, Italy
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
requir
e
 high dynamic range
 low-noise
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
For imaging calorimeters
with MAPMT read-out,
the high gain of the
photodetector at
operating conditions
results in
charge values ranging
from a few tens of fC
(for minimum ionizing particles)
to several hundreds of pC
(for high energy showers)
The idea !
Our group developed a front-end ASIC where
each input signal is split into three equal signals and, then,
each branch is mirrored with different scaling: 1/1, 1/8 and 1/80.
The total number of read-out channels is multiplied by 3
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
A hybrid which houses 12 chip-sets was developed by Ideas ASA
(Norway) as a joint project with the University of Siena and INFN.
Each chip-set consists of two chips:
 ICON_4CH
 VA4_PMT
and has the capability to read-out four anodes of a MAPMT.
The hybrid can eventually house 12 TA-chips (based on the
TA32CG architecture, Ideas ASA, Norway) to give trigger capability
to the system.
Our read-out system prototype is a board with standard VME
interface.
The hybrid is implemented as a piggyback board placed on top of
this VME-board by means of 100mil pitch double-row header
connectors
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
ICON_4CH
VA
(+ optional TA)
~10 cm
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
The ICON_4CH has 4 inputs
Input signals are split into three equal
signals by a current conveyer
Each branch mirrors the input with
different scaling: 1/1, 1/8 and 1/80 and
is linear for input charge values below
~120 pC, ~1050 pC and ~4250 pC
respectively
Since each mirrored signal has its
own output pad, this gives 12 output
pads
Power consumption in quiescent
state is ~3.3 mW (~0.83 mW/channel)
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
It is a 12 channel charge sensitive
preamplifier-shaper circuit with:
low noise (~10 fC),
low power consumption: ~34
mW (~2.8 mW/channels),
high dynamic range (± 32.5 pC),
simultaneous sample-and-hold,
multiplexed analog read-out,
calibration facilities,
programmable gain in the
preamplifiers
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
ICON_4CH
VA4_PMT
PRINCIPLE OF THE
TWO-CHIP STRUCTURE
for one input channel of the
ICON_4CH
The external capacitors
(tipical value ~ 1nF) used
for AC-coupling are shown
in the middle
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
LOW POWER: power budget ~ 10W for ~ 103 channels
Each front-end chipset has about 38 mW power consumption
and this means about 450mW for the hybrid.
HIGH DYNAMIC RANGE: 105, range from 102 fC to 103 pC
CURRENT CONVEYOR (split + mirror)
TRIPLE RANGE
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
MINIMAL CROSS-TALK:
0.1% for input charge values below 100pC, 0.1-0.3% above
ASIC-PMT DISTANCE:
the board is connected to the PMT anodes through standard
50 ohm coaxial cables
• ==> The electronics can be located far away from the PMT
• ==> minimum number of cables: signals + PMT power supply
• ==> a lot of possibilities of implementation, e.g.: crate modules or
stand-alone board.
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
FAULT TOLERANCE:
HYBRID BOARD:
 chip control lines are separated,
 no daisy-chains
VME READ-OUT BOARD:
 one ADC for each VA chip,
 ADC control lines are separated
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
POSSIBLE ADDITIONAL FEATURES:
to give trigger capability to the system, a modified TA chip (from
TA32CG architecture) has been specified to:
 provide an analog output signal proportional to the number of input
channels above a programmable threshold;
 provide an analog output signal proportional to the sum of 4 analog
inputs (they can be chosen among the available 12 channels from the
Icon chip when the die is mounted on the hybrid: this allows additional
flexibility in the choice of the dynamic sub-range to be used for
triggering purposes).
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
Example of application: Trigger in Calorimeters
Hadron Event
EM Event
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
Hybrid
on top of
VME read-out board
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
LED
PMT
Input
signal
Pulse
generator
Trigger
M.G. Bagliesi University of Siena - INFN
Hybrid
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
2nd range
6000
output (mV)
output (mV)
1st range
4000
2000
5000
3750
2500
1250
0
0
0
50
100
150
0
200
500
1000
1500
input charge (pC)
input charge (pC)
output (mV)
3rd range
Channel
3000
2000
1000
0
0
2000
4000
6000
input charge (pC)
8000
Expected Measured Measured
gain ratio gain (mV/pC) gain ratio
0
1
2
1:1
1:8
1 : 80
30
3.5
0.35
1
0.12
0.012
Tests performed with a R7600-00-M4 PMT
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
branch
1:1
1:8
1:80
rms noise (fC)
49
408
4110
S/N ratio for a MIP of 0.8 pC: ~ 16
Noise can be reduced in a future development by:
decreasing the number of ranges from 3 to 2 for the ICON
fixing the gain in the preamplifiers for the VA4
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
Cross-talk for R7600-00-M4 PMT is ~ 0.5%
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
Immediate applications:
New generation space-based or balloon-borne experiments for
the study of high energy primary cosmic rays (e.g.: AMS-02,
CALET, CREAM, ... )
M.G. Bagliesi University of Siena - INFN
A low-power high dynamic range front-end ASIC for imaging calorimeters
8th Workshop on Electronics for LHC Experiments - COLMAR, France -September 9 - 13, 2002
LOW POWER CONSUMPTION: ~ 450mW
HIGH DYNAMIC RANGE: ~105, from 102 fC to 103 pC
MINIMAL CROSS-TALK: less then 0.3%
BOARD-PMT DISTANCE
FAULT TOLERANCE
M.G. Bagliesi University of Siena - INFN