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Performances and Prototyping for the Fast Multiplicity implementation. ALICE-PIXEL-Rome F. Meddi, S. Di Liberto , M. A. Mazzoni , G. M. Urciuoli . M. Marini , S. Sestito . G. Astone , M. Spaziani. Summary: [1] Minimum value of #PIXEL vs efficiency: - PowerPoint PPT Presentation
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4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Performances and Prototyping for the Performances and Prototyping for the Fast Multiplicity implementationFast Multiplicity implementation
ALICE-PIXEL-RomeALICE-PIXEL-RomeF. Meddi,S. Di Liberto,M. A. Mazzoni,G. M. Urciuoli.
M. Marini,S. Sestito.
G. Astone,M. Spaziani.
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Summary:Summary:
[1][1] Minimum value of #PIXEL Minimum value of #PIXEL vs efficiency:comparison of Fast Multiplicity signal obtained by
- single sampling- double sampling - integration
[2] Double Integrator prototype for Fast Multiplicity: - realization and measurements time scale
[3] DAC’s working point study for Fast-Or - laboratory set-up- single chip measurements strategy
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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[1][1] Comments on minimum value of #PIXEL Comments on minimum value of #PIXEL vs efficiencyfrom Fast Multiplicity signal:- data sample taken last September 2002 on the pixel-bus prototype, analyzed in order to choose optimized single and double sampling time(s) and integration time window
Pedestal Study:Pedestal Study:By a digital scope[LeCroy9360-600MHz-5GS/S]N = 136 sweepst = 0.4 ns/sample(20 ns/div & 502 sample)
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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(PEDESTAL) vs Time(PEDESTAL) vs Time
PEDESTAL > vs TimePEDESTAL > vs Time
238n
s23
8ns
288n
s28
8ns
263n
s26
3ns
N=136t=0.4ns
[mV
][m
V]
[s]
PEDESTAL:PEDESTAL:
It shows a maximumsampling50ns50nsafter 238ns(i.e. at 288ns)
.... It is bettersampling 25ns25ns after 238ns(i.e. at 263ns)
Confirmed also by a Pedestal’s Pedestal’s autocorrelation autocorrelation studystudy.
P.S. P.S. Times are measured respect to T.P.
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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CLKCLK
T.P.T.P.
F.M.F.M.
20ns
30ns
280ns
0 100 200 300 ns
220ns
320ns
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Asking that:1) The Signal (S) could be reduced by 2*(S)
and2) The Pedestal (Ped) could be increased by 2*(Ped)
(i.e. asking :2 [S – 2*(S)] – [Ped + 2*(Ped)] 0)
37 ± 2 Pixel/Bus Single sampling @ 263ns
35 ± 5 “ Integrating in 100ns window
35 ± 3 “ Double sampling @ 263ns & @ 363ns
…But, the integration methodintegration method is more reliable respect to the othersbecause it is more stable respect to real system variability characteristics:In fact,
variing the integration time of 25ns a variation of ~ 15%~ 15%;
moving of 25ns the sampling time a factor of ~ 2 worse~ 2 worse;
Minimum #PIXEL/BUSMinimum #PIXEL/BUS obtainaible with Fast Multiplicity:
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Single-SAMPLING: Single-SAMPLING:
@238ns@238ns((fit/SLOPE) = 4.9 PIXEL/BUSfit/SLOPE) = 4.9 PIXEL/BUS
2 = 0 2 = 0 (73.3 (73.3 ± 5.7) PIXEL/BUS± 5.7) PIXEL/BUS
-80
-60
-40
-20
0
20
40
0 20 40 60 80 100 120
Data_DELTA2_238et263ns
DELTA2_@238ns
#PIXEL / BUS
y = m1 + m2 * M0
ErrorValue
4,3054-91,427m1
0,0762581,2465m2
NA226,36Chisq
NA0,98896R
@263ns@263ns((fit/SLOPE) = 2.8 PIXEL/BUSfit/SLOPE) = 2.8 PIXEL/BUS
2 = 0 2 = 0 (37.3 (37.3 ± 2.3) PIXEL/BUS± 2.3) PIXEL/BUS
-40
-20
0
20
40
60
80
0 20 40 60 80 100 120
Data_DELTA2_238et263ns
DELTA2_@263ns
#PIXEL / BUS
y = m1 + m2 * M0
ErrorValue
2,111-39,971m1
0,0363221,0712m2
NA63,619Chisq
NA0,996R
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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-0,06
-0,04
-0,02
0
0,02
0,04
0 20 40 60 80 100 120
Data_eff_doppio-camp_311002
DELTA2
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
0,0028906-0,060356m1
5,1199e-050,00094807m2
NA0,00010204Chisq
NA0,99136R
““in-time” @238nsin-time” @238ns““out-time” @338nsout-time” @338ns
((fit/SLOPE) = 4.4 PIXEL/BUSfit/SLOPE) = 4.4 PIXEL/BUS
2 = 0 2 = 0 (63.7 (63.7 ± 4.6) PIXEL/BUS± 4.6) PIXEL/BUS
-0,04
-0,02
0
0,02
0,04
0,06
0,08
0 20 40 60 80 100 120
Data_eff_doppio-camp_301002
DELTA2
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
0,0022854-0,037495m1
4,048e-050,0010845m2
NA6,3783e-05Chisq
NA0,99585R
““in-time” @263nsin-time” @263ns““out-time” @363nsout-time” @363ns
((fit/SLOPE) = 3.0 PIXEL/BUSfit/SLOPE) = 3.0 PIXEL/BUS
2 = 0 2 = 0 (34.6 (34.6 ± 2.5) PIXEL/BUS± 2.5) PIXEL/BUS
DOUBLE-SAMPLING:DOUBLE-SAMPLING:
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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INTEGRATION IN FIXED TIME WINDOW:INTEGRATION IN FIXED TIME WINDOW:
-1 10-9
-5 10-10
0
5 10-10
1 10-9
1,5 10-9
0 20 40 60 80 100 120
Data_19et201002
DELTA2_@75ns
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
2,4544e-10-2,6051e-09m1
5,2933e-126,3551e-11m2
NA2,8019e-20Chisq
NA0,99313R
Integration in a Time Window of 75nsIntegration in a Time Window of 75ns((fit/SLOPE) = 1.9 PIXEL/BUSfit/SLOPE) = 1.9 PIXEL/BUS
2 = 0 2 = 0 (41.0 (41.0 ± 5.2) PIXEL/BUS± 5.2) PIXEL/BUS
-1,5 10-9
-1 10-9
-5 10-10
0
5 10-10
1 10-9
1,5 10-9
0 20 40 60 80 100 120
Data_191002
DELTA2_@50ns
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
1,655e-10-2,1701e-09m1
2,5639e-123,6897e-11m2
NA8,94e-20Chisq
NA0,99048R
Integration in a Time Window of 50nsIntegration in a Time Window of 50ns((fit/SLOPE) = 4.1 PIXEL/BUSfit/SLOPE) = 4.1 PIXEL/BUS
2 = 0 2 = 0 (58.8 (58.8 ± 6.1) PIXEL/BUS± 6.1) PIXEL/BUS
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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INTEGRATION IN FIXED TIME WINDOW:INTEGRATION IN FIXED TIME WINDOW:
-2 10-9
0
2 10-9
4 10-9
6 10-9
8 10-9
0 20 40 60 80 100 120
Data_191002
DELTA2_@150ns
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
2,3661e-10-2,7236e-09m1
4,1909e-128,9551e-11m2
NA6,8366e-19Chisq
NA0,99349R
Integration in a Time Window of Integration in a Time Window of 150ns150ns
((fit/SLOPE) = 3.8 PIXEL/BUSfit/SLOPE) = 3.8 PIXEL/BUS
2 = 0 2 = 0 (30.4 (30.4 ± 3.0) PIXEL/BUS± 3.0) PIXEL/BUS
-2 10-9
-1 10-9
0
1 10-9
2 10-9
3 10-9
4 10-9
5 10-9
6 10-9
0 20 40 60 80 100 120
Data_DELTA2-vs-PIXsulBUS
DELTA_2*SIGMA
#PIXEL/BUS
y = m1 + m2 * M0
ErrorValue
3,2663e-10-2,8382e-09m1
5,7854e-128,2282e-11m2
NA1,3029e-18Chisq
NA0,98549R
Integration in a Time Window of 100nsIntegration in a Time Window of 100ns((fit/SLOPE) = 5.7 PIXEL/BUSfit/SLOPE) = 5.7 PIXEL/BUS
2 = 0 2 = 0 (34.5 (34.5 ± 4.7) PIXEL/BUS± 4.7) PIXEL/BUS
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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# Fired Pixels nSignal S & (S)Pedestal P & (P)
k [S – k*(S)] – [P + k*(P)]
k 0
k [(S – P) / ((S) + (P))]
nGauss
k
EFFICIENCY “EFFICIENCY “”” vs. #FIRED PIXELS on a BUS: vs. #FIRED PIXELS on a BUS:
0,8
0,82
0,84
0,86
0,88
0,9
0,92
0,94
0,96
0,98
1
10 20 30 40 50 60
Eff_2samples_263ns&363ns
Eff_integration_100ns
Eff_1sample_263ns
n (#PIXEL/BUS)
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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In the case of a PIXEL BUSIn the case of a PIXEL BUSof the inner SPD:of the inner SPD:
a threshold of a threshold of 35 pixels35 pixelscorresponds to corresponds to 22 tracks22 tracks
(using a mean C.L. of 1.56)(using a mean C.L. of 1.56)(*)(*)
...tacking into account ...tacking into account fluctuations in “fluctuations in “””
@ @ 2*2*
(dn / d(dn / d
dn / ddn / d
< (
#PIX
EL
/ H
alf-
Sta
ve)
><
(#P
IXE
L /
Hal
f-S
tave
) >
0
10
20
30
40
50
60
0 100 200 300 400 500 600 700 800
Data_summary-stat-HS-layer1
mean_HSmean_HS - 2*rms_HSmean_HS + 2*rms_HS
-2*-2*
+2*+2*
Minimum (Minimum (dn / ddn / d obtainaible with Fast Multiplicity:
(*) Thanks to T.Virgili
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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[2] Double Integrator prototype for Fast Multiplicity:- Functional blocks
Control Logic
Double Integrator A/D
C
(DSP)
PC
F.M.F.M.
CLKCLK
T.P.T.P.
FIFO
discussed with G. Anelli
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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- Double integrator:- Double integrator:
ADCADC FIFOFIFOMicrocontrollerMicrocontroller
(DSP)(DSP)
BoardBoard
IIFM-ChipFM-Chip IIFM-ChipFM-Chip
ControlControlLogicLogic
CLKCLK
T.P.T.P.
SW1SW1
SW2SW2
SW4SW4
SW3SW3
SW5SW5
SW1SW1
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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- Control Logic:- Control Logic:
FPGAFPGA
HOLD
HOLD
SELECTCH1
CLKCLK
T.P.T.P.
SW1SW1
SW2SW2
SW3SW3
SW4SW4
SW5SW5
SELECTCH2
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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[3] Working point study for Fast-Or:
- Measurements done on a single chip(.... tests repeated on several chips required)
- Simple h/w added to the Standard Pixel System Test Set-up to count the Fast-Or signals
GTL/TTL
COUNTER
F.O.F.O.
T.P.T.P.
RSTRST
DISPLAY
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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For DAC[20] = 0 ~ 100For DAC[20] = 0 ~ 100
Fast-Or error Fast-Or error probability:probability:
Few spurious hitsFew spurious hits(< 2 10(< 2 10-3 -3 ))
@@ Pre_VTH = 220Pre_VTH = 220(~1200e)(~1200e)
““No” spurious hit No” spurious hit (i.e. < 10(i.e. < 10-6 -6 ))
@@ Pre_VTH = 215Pre_VTH = 215(~1600e)(~1600e)
0,0001
0,001
0,01
0,1
0 20 40 60 80 100
Data_FO-Ped_230103
FO_ERROR-PROBABILITY + SIGMAFO_ERROR-PROBABILITYFO_ERROR-PROBABILITY - SIGMA
DAC[20]
(@ PreVTH=220)(@ PreVTH=220)
Fast-Or ERROR Probability:Fast-Or ERROR Probability:
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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In the range:In the range:DAC[20]=30 ~ 90DAC[20]=30 ~ 90
Fast-Or Fast-Or for 1Fired Pixelfor 1Fired Pixel
(r#2, r#252;(r#2, r#252;c#7, c#15, c#22) c#7, c#15, c#22)
Efficiency = 100%Efficiency = 100%
Without any Without any spurious hitspurious hit( ( < 4 < 4 **1010-4 -4 ))
Fast-Or pulse efficiencyFast-Or pulse efficiency [#FO /#TRG][#FO /#TRG]@ Pre_VTH=215@ Pre_VTH=215 vs DAC[20] valuevs DAC[20] value
with with only 1 fired pixelonly 1 fired pixel far or close the chip “pad area”far or close the chip “pad area”
0
0,5
1
1,5
2
0 20 40 60 80 100 120
DAC[20]
L C R
C
R L
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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0
0,5
1
1,5
2
0 20 40 60 80 100 120
(#FO / #TRG)_r252&253c22_a(#FO / #TRG)_r252&253c22_b(#FO / #TRG)_r252&253c22_c(#FO / #TRG)_r2&3c22_a(#FO / #TRG)_r2&3c22_b(#FO / #TRG)_r2&3c22_c(#FO / #TRG)_r252&253c7_a(#FO / #TRG)_r252&253c7_b(#FO / #TRG)_r252&253c7_c(#FO / #TRG)_r2&3c7_a(#FO / #TRG)_r2&3c7_b(#FO / #TRG)_r2&3c7_c(#FO / #TRG)_r252&253c15_a(#FO / #TRG)_r252&253c15_b(#FO / #TRG)_r252&253c15_c(#FO / #TRG)_r2&3c15_a(#FO / #TRG)_r2&3c15_b(#FO / #TRG)_r2&3c15_c
DAC[20]
Fast-Or pulse efficiencyFast-Or pulse efficiency [#FO /#TRG][#FO /#TRG]@ Pre_VTH=215@ Pre_VTH=215 vs DAC[20] valuevs DAC[20] value
with with 2 fired pixel 2 fired pixel along columnalong column in several zones of the chip matrix in several zones of the chip matrix
(r#2-3, r#252-253;(r#2-3, r#252-253;c#7, c#15, c#22)c#7, c#15, c#22)
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Fast-Or pulse duration Fast-Or pulse duration vs DAC[20] value vs DAC[20] value with with only 1 fired pixelonly 1 fired pixel @ Pre_VTH=215 @ Pre_VTH=215
(r#2, r#252;(r#2, r#252;c#7, c#15, c#22)c#7, c#15, c#22)
0
10
20
30
40
50
60
70
0 20 40 60 80 100 120
FO_FWHM_r2c22_a_preVTH215FO_FWHM_r2c22_b_preVTH215FO_FWHM_r2c22_c_preVTH215FO_FWHM_r252c22_a_preVTH215FO_FWHM_r252c22_b_preVTH215FO_FWHM_r252c22_c_preVTH215FO_FWHM_r252c7_a_preVTH215FO_FWHM_r252c7_b_preVTH215FO_FWHM_r252c7_c_preVTH215FO_FWHM_r2c7_a_preVTH215FO_FWHM_r2c7_b_preVTH215FO_FWHM_r2c7_c_preVTH215FO_FWHM_r252c15_a_preVTH215FO_FWHM_r252c15_b_preVTH215FO_FWHM_r252c15_c_preVTH215FO_FWHM_r2c15_a_preVTH215FO_FWHM_r2c15_b_preVTH215FO_FWHM_r2c15_c_preVTH215
DAC[20]
4-th February 2003 CERN - SPD/ITS Meeting F.Meddi
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Fast-Or pulse duration Fast-Or pulse duration withwith only 1 fired pixelonly 1 fired pixel@ (DAC[20] = 60 & Pre_VTH = 215)@ (DAC[20] = 60 & Pre_VTH = 215)
Time
220ns 230ns 240ns 250ns 260ns 270ns 280ns 290ns 300nsV(c22r252) V(c22r2) V(c15r252) V(c15r2) V(c7r252) V(c7r2)
0V
0.5V
1.0V
1.5V
2 4 6
1 3 5
On the whole chip:FWHM 17~40 ns17~40 ns jitter 18ns max18ns max
10ns
11
223344
55 66
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Conclusion:Conclusion:
[1][1] Minimum value of #PIXEL Minimum value of #PIXEL vs efficiencyobtainable from Fast Multiplicity signal from a singlehalf-stavehalf-stave by integration in 100ns time window: 35 35 55
[2] Double Integrator prototype for Fast Multiplicityneeds to be ready before the submission of FADC chipfor functionality feedback check:- prototype realization and measurements: end of Marchend of March
[3] DAC’s working point study for Fast-Or:- full efficiency with 1 fired pixel:
DAC[20] = 30 ~ 90 @ Pre_VTH=215
- more systematic study: end of Aprilend of April
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