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2016-02-08

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cc-by (c) Mazorra, José et al., 2016
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/125284

PACIFIC: the readout ASIC for the SciFi Tracker of the upgraded LHCb detector

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https://doi.org/10.1088/1748-0221/11/02/C02021

Abstract

The LHCb detector will be upgraded during the Long Shutdown 2 (LS2) of the LHC in order to cope with higher instantaneous luminosities and will switch to a 40 MHz readout rate using a trigger-less software based system. All front-end electronics will be replaced and several sub-detectors must be redesigned to cope with the higher detector occupancy and radiation damage. The current tracking detectors downstream of the LHCb dipole magnet will be replaced by the Scintillating Fibre (SciFi) Tracker. The SciFi Tracker will use scintillating fibres read out by Silicon Photomultipliers (SiPMs). State-of-the-art multi-channel SiPM arrays are being developed and a custom ASIC, called the low-Power ASIC for the sCIntillating FIbres traCker (PACIFIC), will be used to digitise the signals from the SiPMs. This article presents an overview of the R&D for the PACIFIC. It is a 64-channel ASIC implemented in 130 nm CMOS technology, aiming at a radiation tolerant design with a power consumption below 10 mW per channel. It interfaces directly with the SiPM anode through a current mode input, and provides a configurable non-linear 2-bit per channel digital output. The SiPM signal is acquired by a current conveyor and processed with a fast shaper and a gated integrator. The digitization is performed using a three threshold non-linear flash ADC operating at 40 MHz. Simulation and test results show the PACIFIC chip prototypes functioning well.

Subject

Circuits electrònics, Detectors, Electrònica digital

Subject (English)

Electronic circuits, Detectors, Digital electronics

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Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citation

MAZORRA, José, et al. PACIFIC: the readout ASIC for the SciFi Tracker of the upgraded LHCb detector. Journal of Instrumentation. 2016. Vol. 11. ISSN 1748-0221. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/125284

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