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STATUS OF SPIROC measurement

STATUS OF SPIROC measurement. Reminder : Block scheme of SPIROC. 36-channel Wilkinson ADC. Event builder. Main Memory SRAM. Analog channel. Analog mem. Ch. 0. Analog channel. Analog mem. Ch. 1. AHCAL SLAB. Analog channel. Analog mem. Ch. 35. 24 bit counter. Time digital mem.

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STATUS OF SPIROC measurement

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  1. STATUS OF SPIROC measurement

  2. Reminder : Block scheme of SPIROC 36-channel Wilkinson ADC Event builder Main Memory SRAM Analog channel Analog mem. Ch. 0 Analog channel Analog mem. Ch. 1 AHCAL SLAB Analog channel Analog mem. Ch. 35 24 bit counter Time digital mem. Bunch crossing Com module Trigger control Memory pointer Ludovic Raux - SPIROC ASIC measurement

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

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

  6. Preampfier measurement Qinj= 680fC (~4pe at SiPM gain of 106) Ludovic Raux - SPIROC ASIC measurement

  7. 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 Ludovic Raux - SPIROC ASIC measurement

  8. Input DAC linarity -/+2% Residuals in per cent Ludovic Raux - SPIROC ASIC measurement

  9. Conclusion • SPIROC test have started and in progress • 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 Ludovic Raux - SPIROC ASIC measurement

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