KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
Laboratori Frascati
GASTONE (Gem Amplifier Shaper
Tracking ON Events)
A prototype Front-End chip for the KLOE Inner Tracker
Detector
On behalf of KLOE2
Bari-LNF Collaboration
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
KLOE II Inner Tracker - FEE Status
Outline
INFN-Bari
Servizio Elettronico
Laboratori Frascati
KLOE detector upgrade requirements
Inner Tracker purpose and requirements
• prototype detector parameters
Readout device parameters
• readout requirements & time constraints
• readout data frame
Front-End Electronics development
• GASTONE device description
• analog and digital blocks (main features)
• GASTONE Front-End Board
• prototype testing
Detector - FE integration
• Input protection
• RO boards - strip interconnections
Future plans and developments
Conclusions
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
2
KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
Laboratori Frascati
KLOE detector upgrade requirements
Improve vertex reconstruction of KS
and  decays
5 tracking layers
Inner Tracker
from 150 to 250 mm
200x500 µm spatial resolution
700 mm active length
Drift chamber
1.5% X0 total radiation length
Technology: Cylindrical-GEM
IT Proto 1.0 (constructed in 2007)
Triple-GEM with 3,2,2,2 gap thickness
150 mm radius (Layer 1) x 352 mm
active length
Electrodes obtained joining 3 foils
(450x320 mm2)
650 µm pitch (only along r)
Anode readout with 1538 strips
One-dimensional readout
Pisa
- 22/12/2015
Antonio
Ranieri
128 ch equipped with GASTONE 3
RD51 Collaboration Meeting Paris 13-15 October 2008
KLOE II Inner Tracker - FEE Status
Inner Tracker Purpose and Requirements

Tracking device (NO charge / NO time measurements)

Low gas gain device
• High sensitivity head amplifier (few fC)

High density readout (pitch  650m / 35k RO channels)
• Low power FE

Most internal layer strip rate < 30 kHz
• DC restorer can be avoided
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 Expected input charge range: 10  50 fC

Stereo strips RO
• Cin spread (1 pF ÷ 50 pF)

Very light device (kapton + support structure)
• R&D on detector - readout integration
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
4
KLOE II Inner Tracker - FEE Status
INFN-Bari
Prototype detector parameters
Detector X-ray Test validation
Servizio Elettronico
Laboratori Frascati
CGEM in current mode
10x10cm2 GEM used as reference
(normalization for pressure/temperature
effects)
Gain and electron transparency
measured
Uniformity measured throughout the
whole CGEM surface
6 keV X-ray gun
Ref GEM
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
5
KLOE II Inner Tracker - FEE Status
INFN-Bari
Readout device parameters
Servizio Elettronico
Laboratori Frascati
KLOE DAQ timing
“bunched” beam structure
• < 2 s (data RO)
• 200 ns (input signal spread – worst case)
• 96 bits to be read in < 2 s (acquisition rate 100 Mbps)
1.
2.
3.
4.
High modularity (64 channels)
Serial RO protocol (to reduce power consumption and cables)
a. Copper link
RO clock only after trigger arrival (to avoid internal x-talk)
OR output (self-trigger capability)
1 bit / channel
Header
(8+2 bits)
Antonio Ranieri
Trigger
Counter(5bits)
Chip ID
(9 Bits)
Data (64 Bit)
RD51 Collaboration Meeting Paris 13-15 October 2008
End Byte
(8 zeros)
6
KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
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GASTONE device description
Analog
Pre
A/S
Digital
Tigger
Comp/Mon
In 1
Ck (RO)
S
H
A
P
I
N
G
Pre
A/S
In 64
Comp/Mon
M
A
S
K
C
O
N
T
R
O
L
Common
Signals
CMOS AMS 0.35m
Data out
Data in
Ck (SC)
Common
SC
signals
Reset
Data (RO)
 16 Analog channels + 2 dummy channels
 ~ 3.2x2.6 mm2 die
 complete digital section (64 chan)
 QFP80 package (24x16 mm2)
Low-noise and low-power mixed analog-digital
ASIC designed to satisfy IT requirements
First 16 channel prototype already tested
Second 16 channel release with protection network
inside the chip will be mounted soon
64 channels proto beginning of 2009
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
KLOE II Inner Tracker - FEE Status
INFN-Bari
Analog Section - 3 basic blocks (simulation)
Servizio Elettronico
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type Pre-amplifier (cascode configuration)
Feedback capacitor 150 fF
1
a charge preamplifier to
integrate the input strip
current into a voltage
Internal test pulsing capability
(10 fC)
Feedback resistor 100 MΩ
W/L aspect ratio 500/0,5
gm 2.2 mA/V
Bias current 110 A
Pre-amplifier gain 5.6 mV/fC @ CIN=0 pF
Non linearity < 1%
2
a semi-gaussian shaper (CRRC) circuit providing noise
filtering
type Shaper (cascode configuration)
Voltage gain 4
Non linearity < 3%
Bias current 110 A
Peaking time @ Cdet=10 50 pF 90 220 ns
3
A leading-edge discriminator
designed in fully differential
mode AC-coupled with
previous stage for reducing
the channel to channel offset
variations
Antonio Ranieri
type Leading edge
Threshold range 0.5  200fC
Bias current 180 A
RD51 Collaboration Meeting Paris 13-15 October 2008
8
KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
Laboratori Frascati
Digital Section - 4 basic blocks
3
1
max 1 µs width
Discr 1
Discr 64
monostable
monostable
S
E
R
I
A
L
I
Z
E
R
CONTROLLER
DAC Vth x 4
DAC Monost.
4
ADC Vth x 4
ADC Monost.
Ck(RO)
Trigger
Pulse Odd
Pulse Even
Mask
Data (RO)
DATA RO SECTION
Antonio Ranieri
2
Data Out
Data In
Ck (SC)
Reset
CONTROL SECTION
RD51 Collaboration Meeting Paris 13-15 October 2008
9
KLOE II Inner Tracker - FEE Status
INFN-Bari
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Laboratori Frascati
GASTONE Front-End Board
“Slow Control” section implemented to:
Main features:
•
•
•
•
•
•
•
•
•
•
2 chips/board (16 Ch (64) up / 16 (64) down)
One serial readout line per chip
10 LVDS communication lines/board
Clock readout signal (50 MHz)
One mask register for dead channels
OR output for 16 (64) channels for selftriggering
HW ID for each chip
4 DAC + 4 ADC (8 bits) to set thresholds (one
for 16 channel)
1 DAC (8 bits) + 1 ADC (8 bits) to set
monostable output width
Default threshold value (fC) set at “power-on”







Set threshold value (8 bit DAC)
Set the monostable pulse width
Enable external pulse system
Enable internal/External pulsing system
Read back threshold values (8 bit ADC)
Read back the value for monostable width
setting
Enable channel readout through an internal
mask register
Input protection
circuit
GEM strip inputs
Gastone 16 chs
About 600 chips plus 300 VFEB including
spares are foreseen to fully instrument the
final detector
Dimensions: 30x95 mm2
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
10
KLOE II Inner Tracker - FEE Status
Prototype testing
INFN-Bari
Servizio Elettronico
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Measurements:
1.
2.
3.
4.
5.
6.
7.
8.
Charge sensitivity  Linearity
Uniformity among channels
Time-walk
ENC
Cross-talk
Threshold calibration curve
Pulse-width calibration curve (vs. Vmon voltage)
Functional test of digital section:
a) Spi interface (write/read internal registers, DACs and ADCs)
b) Data readout
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
11
KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
Laboratori Frascati
Prototype testing (II)
Board0_ chip0
Charge sensitivity, linearity and uniformity
350
ch 0
300
ch 1
Threshold mV
ch 2
ch 3
250
ch 4
ch 5
200
ch 6
ch 7
150
ch 8
ch 9
100
ch 10
ch 11
50
ch 12
Gain
22 chips
352 channels
<gain> 25 mV/fC
ch 13
0
0
2
4
6
8
10
Charge fC
ch 14
12
1
ch 15
frequency
0,9
0,8
0,7
0,6
0,5
0,4
0,3
Gain sensitivity measurement
0,2
0,1
0
23
Antonio Ranieri
24
25
26
27
gain mV/fC
RD51 Collaboration Meeting Paris 13-15 October 2008
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KLOE II Inner Tracker - FEE Status
INFN-Bari
Servizio Elettronico
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Prototype testing (III)
time walk
200
soglia 161,15 mV
180
soglia 241,7 mV
160
soglia 322,3 mV
Different threshold values:
• Th1 = 6.45 fC
• Th2 = 9.67 fC
• Th3 = 12.9 fC
Time ns
140
120
100
80
60
40
20
0
0
5
10
15
20
25
30
35
input charge fC
ENC sim = 395 e + 51 e /pF
ENC meas = 974 e + 59 e /pF
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
13
KLOE II Inner Tracker - FEE Status
Prototype testing: summary
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Servizio Elettronico
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GASTONE parameters



Antonio Ranieri
Input impedance
400 
Cdet range
0 ÷ 50 pF
Number of channels
16
I/O
Differential and serial
Baseline restorer
No
Total Gain sensitivity
25 mV/fC
Peaking time
90 ns÷200 ns (CD=0 ÷50 pF)
ENC (rms) measured on detector
974 e- + 59 e-/pF
Threshold sensing/setting
8 bits ADC/DAC (16 chs modularity)
Power consumption
0.6 mA/Ch
24 chips assembled on 12 boards have been tested performing noise
and gain measurements.
Noise measurements in the final setup (i.e. boards connected to the
layer 0 readout strips) show a value of 974 e- + 59 e-/pF ≈ 0.6 fC (22 pF)
 1.5 fC will allow good event selection.
The measured cross talk among adjacent channels is < 1%
RD51 Collaboration Meeting Paris 13-15 October 2008
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KLOE II Inner Tracker - FEE Status
Detector - FE Integration
INFN-Bari
Servizio Elettronico
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GASTONE 1’st release
Input protection &
strip reference network
10 
1. Wasting space on FEB
2. strip referred to GND  AC-coupling
10 nF
GASTONE 2’nd release
1. Input protection network inside chip
2. Strip DC-coupled and referred to in-MOS (500 mV )
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
15
KLOE II Inner Tracker - FEE Status
Detector - FE Integration
Input connections
Antonio Ranieri
Front-End faraday-cage
RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico
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Output
connections
16
KLOE II Inner Tracker - FEE Status
Detector - FE Integration: test on CGEM
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Servizio Elettronico
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diameter 300mm, active length 352 mm. (Kloe IT Layer1)
 GEM size: 450x1000 mm2 (join of 3 GEM foils 450 x 333 mm2)
 anode readout with 1538 strips (only X coordinate)
GASTONE front-end board
•Written a new DAQ
•Performed noise measurements on
chamber allowing the measurement of the
actual readout strip capacitance
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
KLOE II Inner Tracker - FEE Status
INFN-Bari
Detector - FE Integration: cosmic ray setup
Servizio Elettronico
Laboratori Frascati
Triple coincidence
of scintillators for
trigger
2 sets of drift
tubes in streamer
mode for tracking
Load cell for CGEM
mechanical tensioning
Antonio Ranieri
2 opposite zones are equipped with FEE
RD51 Collaboration Meeting Paris 13-15 October 2008
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KLOE II Inner Tracker - FEE Status
INFN-Bari
Detector - FE Integration: test at PS T9 beam
electronics rack
detectors
Servizio Elettronico
Laboratori Frascati
beam line: 10 GeV pion
beam
128 ch w GASTONE (0.5M evts)
drift tubes in streamer mode for tracking
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
19
KLOE II Inner Tracker - FEE Status
INFN-Bari
Detector - FE Integration (preliminary)
Servizio Elettronico
Laboratori Frascati
GEM residuals with respect to the
track reconstructed by the drift tubes
GASTONE
(global)2 = (GEM)2 + (tracker)2
(GEM)2 = 250µm2 – 140µm2  200µm2
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
20
KLOE II Inner Tracker - FEE Status
INFN-Bari
Detector Integration (future implementation)
Study of a possible
arrangement of HV-connectors,
gas inlets, mechanical support
for FEE boards
Servizio Elettronico
Laboratori Frascati
carbon-fiber
shell
FEE board
kapton readout
circuit
ASIC
fiberglass FEE
support
signal connector
gas
inlets/outlets
HV connector
Pisa
- 22/12/2015
Antonio
Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
21
21
KLOE II Inner Tracker - FEE Status
Current developments
INFN-Bari
Servizio Elettronico
Laboratori Frascati
 XV Readout Studies
 Readout circuit with XV strips engraved on a single Kapton substrate
 The readout prototype will be mounted on dedicated 10x10cm2 GEM detectors to study
and finalize the readout of the IT
 old and new ASIC releases will be used
Two ground configurations will be tested
Production of bigger planar GEM detector and tests with GASTONE will then proceed
X pitch
650 µm
40
°
1000
µm
X strips and V strips on the same plane
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
KLOE II Inner Tracker - FEE Status
Conclusions
INFN-Bari
Servizio Elettronico
Laboratori Frascati
Achievements
24 GASTONE prototypes (16 chs) have been produced and tested
IT layer 0 has been instrumented with 128 chs GASTONE prototypes
 A GASTONE data readout system has been implemented and fully integrated with the RO
SW used in cosmic ray setup and CERN test beam.
Spatial resolution of CGEM layer1 prototype has been measured with GASTONE giving
expected results
The ASIC performances fulfill the requirements
Next steps – GASTONE Rel. 2
 Integration of input protection network (several tests will
be performed to test tolerance to discharges)
 Programmable test pulsing capability (0 – 50 fC)
25 chips (2’nd release) have been already delivered
We are waiting to receive the new FEBs
Lab tests will start soon and if successful the new FEBs will
be mounted on the detector for new integration tests
Final steps – GASTONE Rel. 3
Proceed with the 64 prototype (beginning of the next year)
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
23
KLOE II Inner Tracker - FEE Status
SPARE SLIDES
Antonio Ranieri
RD51 Collaboration Meeting Paris 13-15 October 2008
INFN-Bari
Servizio Elettronico
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24
KLOE II Inner Tracker - FEE Status
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Cluster size
“Smile” effect due to
longer projected path
of non-radial tracks
Qth = 3.5 fC
Antonio Ranieri
GASTONE
RD51 Collaboration Meeting Paris 13-15 October 2008