status of the carioca project
DESCRIPTION
Status of the CARIOCA project. Walter Bonivento CERN / INFN Cagliari for the LHCb collaboration and the CERN MIC group. The LHCb muon detector. LHCb muon detector: main task provide L0 trigger for b X Five stations, M1 to M5; four radial regions, R1 to R4. - PowerPoint PPT PresentationTRANSCRIPT
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LEB Conference, Stockholm 2001
Status of the CARIOCA projectStatus of the CARIOCA projectWalter BoniventoWalter Bonivento
CERN / INFN CagliariCERN / INFN Cagliarifor the LHCb collaborationfor the LHCb collaborationand the CERN MIC groupand the CERN MIC group
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The LHCb muon The LHCb muon detectordetector
R3-R4 of M4-M5 RPC 48% area rate cap. 1kHz/cm2
R1-R2 of M1 t.b.d. 1% area rate cap. 1MHz/cm2
the rest MWPC 52% area rate cap. 100kHz/cm2
LHCb muon detector: main task provide L0 trigger for b X
Five stations, M1 to M5; four radial regions, R1 to R4
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
Readout electronicsReadout electronicsfor MWPC:for MWPC:
a) detector architecture a) detector architecture
2mm gap, 1.5mm wire spacing
wire, cathode and combined readout
Main performance requirement: efficiency in 20ns >99%
2 bi-gap logically OR-ed (DIALOG chip)
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
Detector signal: current with fast (ns) rise, fall
Detector capacitance from 20pF to 200pF
One threshold for time stamping: time resolution from slewing effect
Readout electronicsReadout electronicsfor MWPC:for MWPC:
b) requirementsb) requirements
Optimum amplifier peaking time compromise between noise and slewing
5.1)(1nst
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
Optimum amplifier peaking time: about 10ns
At large Cdet weak dependence of time resolution on peaking time
To be able to set the threshold at about 6 p.e.
Readout electronicsReadout electronicsfor MWPC:for MWPC:
b) requirementsb) requirements
Measurements on a prototype chamber performed with ahybrid from PNPI and a modified version of ASDQ chip (M.Newcomer-Penn)
noise <2fC for Cdet 40-250pF
At gas gain of 105
average 40fC for wires and 20fC for cathode range 150fC for 95% of the signals
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
High rate: dead time
pulse width <50ns unipolar and tail cancellation
wire signals AC coupled with RLCdec= 100s
baseline shifts baseline restoration
Low cross-talk : Zin< 50
Readout electronicsReadout electronicsfor MWPC:for MWPC:
b) requirementsb) requirements
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
CARIOCACARIOCAProject overviewProject overview
80k FE channels at 1Mrad dose in 10 years custom chip in radiation tolerant technology 0.25 m CMOS
Final goal: differential structure
Cancels preamp
tail
Cancels 1/ttail
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
CARIOCACARIOCAProject overviewProject overview
PROTOTYPE CHIPS: step by step approach
•2000: positive preamp+current discriminator +LVDS 4ch (1 analog ch.)
•2001: positive preamp+current discriminator +LVDS 14ch
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
CARIOCACARIOCAProject overviewProject overview
•2001: negative preamp 8ch analog
•2001: positive preamp+shaper 4ch analog (diff. out.)
•2001: positive preamp+shaper+voltage discriminator+LVDS 4ch (diff. out.)•2002: positive and negative full chain with baseline restorer (diff.out.)
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The positive The positive preamplifier:preamplifier:
a) designa) designCurrent amplifier NMOS with current mode feedback; unipolar
feed
NN
CRgmgm
p 2321 Dominant pole at about 20MHz, the other two at
150MHz and 300MHz
Large input transistor W/L=1600m/0.7mId=2mA
6I
I
3
4
IN
OUT N
N
gmgm
Followed by current discriminator (presented at LEB2000 by D.Moraes and replaced by a voltage discriminator in next version) +LVDS driver
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The positive The positive preamplifier:preamplifier:
b) measurementsb) measurements
Response to a delta Linearity...and analog measurements
Sensitivity: 8mV/fC (measurement)
Digital (S-curve)...
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The positive The positive preamplifier:preamplifier:
b) measurementsb) measurements
Threshold vs.Cd
Response to a delta
Channel uniformity of noise and threshold: 7% r.m.s. Cross talk around 1%
Power consumption of about 18mW per channel dominated by LVDS driver
Simulation (CADENCE)
Analog measurementDigital measurement
Noise vs. Cd
ENC = 867e- + 36e-/pF
calculation from noise theory
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The positive The positive preamplifier:preamplifier:
b) measurementsb) measurementsProblems of the discriminator:1) it does not work below 10fC (need 5fC). It was tested on a chamber prototype efficiency plateau shifted by 100V w.r.t. to our best measurement (with ASDQ chip).
2) it slows down the signal rise-time significantly (input C of discr.)
Peaking time vs.Cd
7ns are expected from p.a. alone
Discriminator changed in next versions of the chip
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The negative The negative preamplifier:preamplifier:
a) designa) design
N2,N3,N4 replaced by PMOS
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The negative and The negative and positive preamp:positive preamp:
frequency responsefrequency response negative positive
Input impedance: below 50
3dB level is at:• 16 MHz for negative• 23 MHz for positive
CADENCE simulation
Closed loop gain
Cdet=60pF
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The negative The negative preamplifier:preamplifier:
b) measurementsb) measurementsResponse to a delta
Linearity
Cd=100pFCd=15pF
MeasurementsSimulation
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
Peaking time vs. Cdimproved w.r.t firstprototype
Sensitivity vs. Cd
The negative The negative preamplifier:preamplifier:
b) measurementsb) measurements
Noise vs. Cd
Response to a delta
ENC= 951e- + 31e-/pF
MeasurementsSimulation
Channel uniformity of noise and threshold: 7% r.m.s.
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The negative The negative preamplifier:preamplifier:
b) measurementsb) measurements
Response to a quasi 1/t pulse
Cd=15pF
Cd=100pFquasi 1/t injector
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:a) designa) design
Designed for 1ns peaking time (not to add to the preamp)
Folded cascode fully differential balanced (CMF)
Dominant pole (neglecting p.z. comp)at 160MHz
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:a) design a) design
snnsnsns
ss
ss
405.3809
/1/1
/1/1
42
31
4
3
2
1
Cdet=60pF
• 2-pole/zero network to compensate for the 1/t tail • basic idea from R.A.Boie et al.,NIM 192(1982)365• adapted to a differential amplifier design (M.Newcomer, Penn)
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Response to a delta: single ended ouptut (true output will be differential)
Cd=15pF Cd=100pF
This prototype chip with the positive preamplifier
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Response to a delta: single ended output (true output will be differential). Saturation current on ( ) and off ( )
Linearity: improved with saturation current ON (changes the DC level at the drain of N0)
MeasurementsSimulation
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Response to a delta: single ended output (true output will be differential). Saturation current on.
Cd=15pF
Cd=100pF
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Noise vs. Cd
Sensitivity vs. Cd
Response to a delta: single ended output
ENC= 1290e- + 40e-/pFwith saturation current ON
MeasurementsSimulation
Parallel noise term higher thanpreamp alone due to twopreamplifiers at shaper input
Peaking time vs. Cd.Faster than negative consistent with different bandwidth
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Response to a quasi 1/t pulse
Cd=15pF
Cd=100pF
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
The shaper:The shaper:b) measurementsb) measurements
Peaking time vs. Cd
Sensitivity vs. Cd
Pulse width vs. Cd
Response to a quasi 1/t pulse
MeasurementsSimulation
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LEB Stockholm 2001
W.Bonivento CERN/INFN Cagliari
Conclusions and Conclusions and perspectivesperspectives
• Amplifier+shaper+Voltage discriminator chip (following ATLAS MDT chip design) under test • +Baseline restoration chip under design
Negative preamplifier and positive preamplifier with shaperchips tested and satisfying the requirements for LHCb operation
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LEB Conference, Stockholm 2001
THE ENDTHE END