PARISROC, a Photomultiplier Array Integrated Read Out Chip

TL;DR

PARISROC is an integrated readout chip designed for photomultiplier arrays, enabling triggerless data acquisition with precise charge and time measurements for neutrino experiments.

Contribution

It introduces a complete ASIC with 16 auto-triggered channels, combining charge and time measurement capabilities in a compact, integrated design for high-energy physics applications.

Findings

Charge measurement linearity from 1 to 300 p.e.

Time resolution of 1 ns with coarse and fine timing

Efficient data transmission of relevant information

Abstract

PARISROC is a complete read out chip, in AMS SiGe 0.35 !m technology, for photomultipliers array. It allows triggerless acquisition for next generation neutrino experiments and it belongs to an R&D program funded by the French national agency for research (ANR) called PMm2: ?Innovative electronics for photodetectors array used in High Energy Physics and Astroparticles? (ref.ANR-06-BLAN-0186). The ASIC (Application Specific Integrated Circuit) integrates 16 independent and auto triggered channels with variable gain and provides charge and time measurement by a Wilkinson ADC (Analog to Digital Converter) and a 24-bit Counter. The charge measurement should be performed from 1 up to 300 photo- electrons (p.e.) with a good linearity. The time measurement allowed to a coarse time with a 24-bit counter at 10 MHz and a fine time on a 100ns ramp to achieve a resolution of 1 ns. The ASIC sends out only the relevant data through network cables to the central data storage. This paper describes the front-end electronics ASIC called PARISROC.