1. STATUS OF SPIROC measurement
Michel Bouchel, Stéphane Callier, Frédéric Dulucq, Julien Fleury, Gisèle Martin-Chassard, Christophe de La Taille, Ludovic Raux
jeudi 10 janvier 2008

2. Reminder : Block scheme of SPIROC
Analog channel
Analog mem.
36-channel
Wilkinson
ADC
Event
builder
Main
Memory
SRAM
Ch. 0
Analog channel
Analog mem.
Ch. 1
AHCAL SLAB
Analog channel
Analog mem.
Ch. 35
12 bit counter
Time
digital mem.
Bunch crossing
Com
module
Trigger
control
Memory
pointer
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

3. Reminder : One channel jeudi 10 janvier 2008ns
50-100ns
Gain selection
4-bit threshold adjustment
10-bit DAC
15ns
DAC output
HOLD
Slow Shaper
Fast Shaper
Time measurement
Charge measurement
TDC ramp 300ns/5 µs
12-bit Wilkinson
ADC
Trigger
Depth 16
Common to the 36 channels
8-bit DAC
0-5V
Low gain Preamplifier
High gain Preamplifier
Analog memory
15pF
1.5pF
0.1pF-1.5pF
Conversion
80 µs
READ
Variable delay IN
Discri
Gain
Flag TDC
Analog output
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

4. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
Measurement set-up
SPIROC test board
36 SiPM Inputs
ALTERA Cyclone
Test bench
GPIB port
(unused)
USB port
Programmable by JTAG
ASIC
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

5. SPIROC : tested features
Power pulsing
Programmable stage by stage
Preamplifier
Preamp disable
Preamp Feedback capacitances (from 100fF to 1.5pF)
Compensation capacitances
Slow Shaper:
different time constant : 25ns-175ns
Auto-trigger
Trigger with 40fC observed in measurement
Calibration injection capacitance
Embedded bandgap for references
Embedded DAC for trigger and gain selection threshold
Serial analogue output
Probe bus for debug : not operational
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

6. First measurement High gain channel output
680fC ( ~4 gain=106) in SPIROC
Vout=30mV
Noise=1mV
Gain=45mV/pC
pe/noise~7 (expected ~11)
Charge measurement
Auto trigger
Set up:
Cf=400fF
Tau=50ns
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

7. Simulation 680fC ( ~4 pe @SiPM gain=106) in SPIROC Vout = 50mV
Noise = 1.1mV RMS
pe/noise = 11
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

8. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
Shaper simulation
100ns
50ns
High gain
Vin=10mV
Ctest=2pF
25ns
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

9. Preamplifier simulations
High Gain
Tau=50ns
Cf = 0.1 ; 0.2 ; 0.4 ; 0.8 ; 1.5pF
Qinj=10mV*15pF
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

10. Preamplifier measurement and simulation
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

11. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
Pedestal dispersion
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
Standard deviation :
σ =1.8mV
peak-peak=8.3mV
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

12. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
Gain uniformity
Standard deviation :
σ =1.09mV (~1%)
moyenne=110.43mV
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

13. Input DAC linarity 4.5V Standard deviation : σ =8mV (~0.2%)
moyenne=4.49V
Linearity residuals in per cent
Linearity -/+2%
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

14. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
Input DAC linearity
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

15. Trigger and gain selection DAC measurement
Linearity
Gain selection DAC
Trigger DAC
Residuals (mV)
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

16. Crosstalk and trigger time walk
Very low Cross-Talk : 0.3% (long distance cross talk due to slow shaper voltage reference: If this voltage decoupled with 100µF, it becomes negligible ~0.04%)
Trigger time walk: ~6ns
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

17. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
S-curves
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

18. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
S-curves
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

19. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
S-curves
Measured Noise ~8mV
(expected ~ 5mV)
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

20. Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

21. Digital part Frame with an external trigger…. BCID (12bits)
Chip ID (8 bits)
Data Signal
Transmit on signal
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

22. Conclusion Dynamic range Linearity Trigger efficiency 16-depth SCA
SPIROC tests have started and are in progress
Many features to be tested
Dynamic range
Linearity
Trigger efficiency
16-depth SCA
ADC resolution
TDC resolution
Power pulsing & consumption
Digital part
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement

23. Preampfier measurement
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
13.9 10
1000
0.95
11.4
7.8
1200
9.6
6.6
1400
0..9
8.2
5.6
jeudi 10 janvier 2008
Ludovic Raux - Calice electronics meeting - SPIROC ASIC measurement