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

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

Reminder : One channel jeudi 10 janvier 2008 50 -100ns 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

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

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

First measurement High gain channel output 680fC ( ~4 pe @SiPM 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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