STATUS OF SPIROC measurement
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Transcript of STATUS OF SPIROC measurement
Mercredi 18 décembre 2007
STATUS OF SPIROC measurement
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 2
Reminder : Block scheme of SPIROC
Ch. 0
Ch. 1
Analog channel Analog mem.
36-channelWilkinson
ADC
Analog channel Analog mem.
Ch. 35 Analog channel Analog mem.
Bunch crossing 24 bit counterTime
digital mem.
Eventbuilder
Memorypointer
Triggercontrol
MainMemory
SRAM
Commodule
AH
CA
L SLA
B
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 3
Reminder : One channel
50 -100ns
50-100ns
Gain selection
4-bit threshold adjustment
10-bit DAC
15ns
DAC output
HOLD
Slow Shaper
Slow Shaper
Fast Shaper
Time measurement
Charge measurement
TDC ramp 300ns/5
µs
12-bit Wilkinson
ADC
Trigger
Depth 16
Depth 16
Depth 16
Common to the 36 channels
8-bit DAC0-5V
Low gain Preamplifier
High gain Preamplifier
Analog memory
15pF
1.5pF
0.1pF-1.5pF
Conversion 80 µs
READ
Variable delay
0.1pF-1.5pF
IN
Discri
Gain
Flag TDC
Analog output
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 4
SPIROC : tested features
• Preamplifier– Preamp disable (DC coupled channel OFF)– Gain (from 100fF to 1.5pF)– Compensation capacitances
• Slow Shaper: – different time constant : 25ns-175ns
• Auto-trigger– Trigger with 40fC observed in measurement
• Power pulsing– Programmable stage by stage
• Calibration injection capacitance• Embedded bandgap for references• Embedded DAC for trig threshold• Serial analogue output• Probe bus for debug : not yet operationnal
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 5
First measurement
680fC ( ~4 pe @SiPM gain=106) in SPIROC
Charge measurement
Auto trigger
High gain channel output
Vout=30mV
Noise=1mV
Gain=45mV/pC
noise/pe~7 (expected 11)
Set up:
Cf=400fF
Tau=50ns
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 6
Preampfier measurement
Vout=f(1/Cf), Qinj=680fC, tau=25ns
0
5
10
15
20
25
30
35
40
45
0 0.001 0.002 0.003 0.004 0.005 0.006
1/Cf (1/fF)
Am
pli
tud
e (m
V)
Série1
Vout=f(1/Cf), Qinj=680fC, tau=175ns
0
5
10
15
20
25
30
35
0 0.001 0.002 0.003 0.004 0.005 0.006
Amplitude Vout (mV)
1/C
f (1
/fF
)
Série1
Qinj= 680fC (~4pe at SiPM gain of 106)
Cf (fF)noise rms (mV)
tau=25ns
noise rms (mV) tau=175ns
Vout (mV) tau=25ns
Vout (mV) tau=175ns
200 1.2 2.2 42.6 32.5
400 1.0 1.3 26.3 18.7
600 0.92 1.15 18.8 13.2
800 0.9 1.0 13.9 10
1000 0.9 0.95 11.4 7.8
1200 0.9 0.9 9.6 6.6
1400 0..9 0.9 8.2 5.6
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 7
Pedestal dispersion
Standard deviation :σ =1.8mVpeak-peak=8.3mV
The pedestal measurement is coherent with what we expect :-No pedestal pattern (random values according to statistical dispersion)-Statistical dispersion equivalent to what we get with that technology
pedestal
1,152
1,154
1,156
1,158
1,16
1,162
1,164
1,166
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35
Channel
DC
vo
ltag
e (V
)
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 8
Input DAC linarity
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
0 50 100 150 200 250 300
-0,04
-0,03
-0,02
-0,01
0
0,01
0,02
0,03
0 50 100 150 200 250 300
Residuals in per cent -/+2%
Mercredi 18 décembre 2007 Ludovic Raux - SPIROC ASIC measurement 9
Conclusion
• Dynamic range• Linearity• Trigger efficiency• Crosstalk• DAC resolution (input DAC and threshold DAC)• ADC resolution• TDC resolution• Power pulsing & consumption• Digital part
.......
• Many features to be tested
• SPIROC test have started and in progress