SPIROC Status : Last developments for SPIROC Stéphane Callier, Selma Conforti di Lorenzo, Frédéric Dulucq, Gisèle Martin-Chassard, Christophe de La Taille, Ludovic Raux, Nathalie Seguin-Moreau IN2P3/OMEGA-LAL Orsay France raux@lal.in2p3.fr

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg « Building block » Submission of a “Building block” to test and validate new structure for SPIROC 4-Channel ASIC New features: New preamplifier structure based on NMOS input transistor to be less sensitive to coherent noise Preamplifier gain tunable independently on 8 bits (minimum capacitance 6.25 fF) Discriminator connected directly to preamp => No fast shaper => power saved If OK, could be used in “SPIROC 3” or in “SPIROC 2c” Submission in May 2011 Delivery in October 2011 IN2P3 Funding samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Analogue signals HG Preamplifier: Gain = 32mV/pe Noise RMS = 1mV Out_SSH_LG 100 pe (16 pC) ; Cf = 200fF Out_PA_HG 1 pe (160 fC) ; Cf = 200fF HG Preamplifier: Gain = 32mV/pe Noise RMS = 1mV SNR ~ 32 Out_SSH_HG 1 pe (160 fC) ; Cf = 200fF HG Preamplifier + Slow shaper Vmax= 46 mV/pe Noise RMS = 2,3mV SNR ~ 20 (Reminder: in SPIROC SNR~10) Other important remarks: No rate effect observed Negligible cross-talk (<1%) samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg Preamplifier linearity vs Cf Preamplifier gain tunable independently on 8 bits (minimum capacitance 6.25 fF) 1/Vout vs Cf Nice linearity observed => possibility to adjust the gain channel by channel for HG and LG samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Charge measurement linearity SSH_HG_Cf=200fF(PA_gain=100) Dynamic: up to 5pC (~ 30pe) SSH_HG_Cf=1pF(PA_gain=20) Dynamic: up to 16pC (~100pe) SSH_LG_Cf=200fF(PA_gain=5) Dynamic: up to 80pC (~500pe) SSH_LG_Cf=1pF(PA_gain=1) Dynamic: up to 300pC (~1875pe) samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Trigger efficiency 50% trigger efficiency charge vs threshold (Volts) Trigger capability is down to 1/2pe (~ 80 fC) (Reminder: Trigger efficiency is down to 1/3 pe in SPIROC) The expected 5σ (~ 30 fC) cannot be reached due to a internal coupling via the substrate This coupling is understood and could be easily corrected in the future 50% trigger efficiency charge vs threshold (Volts) S-curves for different injected charges (Trigger efficiency vs threshold (DAC units) 1pe (160 fC) samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg EASIROC (ex-SPIROC 0) EASIROC1a -> ”light” version of SPIROC conservative version of EASIROC EASIROC/SPIROC x bugs corrected Corrected « rate dependency » Switches for Cp capacitances removed Cp=1pF for HG Cp=3pF for LG Corrected cross-talk HG/LG Default slow control setup extended Right value for bias resistances implemented (ibm_pa_lg, ibmin_pa) Submitted on the 2th September 2011 Delivery within few days Should validate the correction of the two major problems on the preamps (« rate dependency » and cross-talk HG/LG) samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg Conclusion New preamp structure tested in the “building block” First measurements seem OK (Signal-to-noise ratio, linearity, trigger efficiency, etc.) Further measurements have to be performed to validate it completely Main advantages of this structure: Should be less sensitive to coherent noise No fast shaper => power saved This new preamp is a serious candidate and it could equip a next release of SPIROC Major bugs are understood in SPIROC 2b: « Rate dependency » and HG/LG cross-talk The bugs comprehension should be validated before the end of the year with “EASIROC1a” samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg Backup slides samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Our plans for 2012-2013 : SPIROC 2c New Chip “SPIROC 2c” submission expected in February 2012 Pin-to-pin compatible with “SPIROC 2b” Intermediate chip before SPIROC 3 to validate number of points 1 major improvement: Preamplifier: 3 options : Corrected SPIROC 1 and 2 preamplifier (“Rate dependency”, HG/LG cross-talk) New preamp tested in “building block” Other minor modifications, corrections or improvements Bandgap, delay box, latch on auto-gain discriminator, 4-bit DAC, etc. samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg

Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg Our plans for 2012-2013: SPIROC 3 New Chip “SPIROC 3” submission expected in 2012 or in 2013 depending on the submission of a “SPIROC 2c” version AIDA funding 5 major improvements: Preamplifier: 3 options : Corrected SPIROC 1 and 2 preamplifier (“Rate dependency”, HG/LG cross-talk) New preamp tested in “building block” “Klaus 2” preamplifier New SCA management => real “zero suppress” Channel managed independently -> Implied new digital part (see Frédéric’ talk) SCA Depth will be reduced (from 16 to 8) New TDC => avoid dead time Already existed and tested in PARISROC 2 Slow control by I2C: Developed in collaboration with IPNL Possibility to have a “circular memory mode” Other minor modifications, corrections or improvements Bandgap, delay box, latch on auto-gain discriminator, 4-bit DAC, Slow control cells, etc. samedi 24 novembre 2018 Ludovic Raux – SPIROC Status – AHCAL meeting, DESY, Hamburg