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Développement et caractérisation d'un ASIC de lecture de macro-cellule de photo-détecteurs de grande dimension

Abstract : PMm² is a project funded for three years by the French National Agency for Research (ANR) with the complete title: “Innovative electronics for photo-detectors array used in high energy physics and astroparticles”. The R&D is carried out by three laboratories: the LAL, the IPN Orsay, the LAPP and collaboration with the Université Libre de Bruxelles (ULB). The coverage of large areas of photo-detection is a crucial element of experiments studying high energy atmospheric cosmic showers and neutrinos from different sources (sun, atmospheric, supernova, reactor and accelerator). The next generation of experiments, such as the post-Super-Kamiokande detector or all the Water Cerenkov detector of large dimensions, could not base their programs only on a simple enlargement of existing experiments to improve the detection performance but they must concentrate their efforts on the new R&D programs of complexity reduction. The objective of this project is thus an "upstream research" to realize big detectors using thousands of photomultipliers (PMTs). The project proposes to segment the large surface of photo-detection into macro pixels consisting of an array of 16 PMTs of 12-inches (2*2 m²), connected to an autonomous front-end electronics which works in a triggerless data acquisition mode placed near the array. This is possible thanks to the microelectronics progress that allows to integrate the readout and the signal processing, of all the photomultipliers, in the same circuit (ASIC) named PARISROC (Photomultiplier ARray Integrated in SiGe Read Out Chip). The ASIC must only send out the digital data by network to the surface central data storage. The PARISROC Chip, made in AMS' Silicon Germanium (SiGe) 0.35 µm technology, integrates 16 independent channels for each PMTs of the array, providing charge and time measurements. The charge channel is made by a voltage preamplifier and a slow shaper (up to 200 ns) to shape the input signal. The signal is then saved in the analog memory and converted to digital data thanks to an internal ADC (Analog to Digital Converter). The time channel is made by a fast shaper (15 ns) followed by a discriminator. Thanks to a TDC (Time to Digital Converter), that converts the amplitude in time, the signal is saved in the analog memory, in parallel with the charge, and converted to digital data by the ADC. One innovation is the digital part of PARISROC included in the ASIC to manage the counters, the signal sampling, their conversions and the data transmission. The first prototype of PARISROC chip has a total surface of 19 mm². It has been sent for fabrication in June 2008 to AMS foundry (AustriaMicroSystems) through the CMP (Multi Project Center) and received in December 2008. The ASIC measurements have led to the realization of a second prototype. Important measurements were brought in terms of noise, dynamic range, readout frequency (from 10 MHz to 40 MHz), time measurements (TDC improvements) and charge measurements (Slow shaper improvements). Sent for fabrication in November 2009 and received in February 2010, this new prototype PARISROC 2 has been tested and the characterisation has shown a good overall behavior and the verification of the improvements.
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Submitted on : Thursday, November 18, 2010 - 10:21:55 AM
Last modification on : Wednesday, October 14, 2020 - 3:41:38 AM
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  • HAL Id : tel-00537300, version 1




S. Conforti Di Lorenzo. Développement et caractérisation d'un ASIC de lecture de macro-cellule de photo-détecteurs de grande dimension. Micro and nanotechnologies/Microelectronics. Université Paris Sud - Paris XI, 2010. English. ⟨tel-00537300⟩



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