The OBELIX chip for the Belle II VTX upgrade

• DOI: 10.1016/j.nima.2024.169659
• Publication Date: 2024-07-29T06:12:44Z
• Authors: M. Babeluk; D. Auguste; M. Barbero; P. Barrillon; J. Baudot; T. Bergauer; F. Bernlochner; G. Bertolone; C. Bespin; S. Bettarini; A. Bevan; M. Bona; J. Bonis; F. Bosi; R. Boudagga; P. Breugnon; Y. Buch; G. Casarosa; L. Corona; J. Dingfelder; A. Dorokhov; G. Dujany; C. Finck; F. Forti; A. Frey; D. Fougeron; A. Gabrielli; L. Gaioni; S. Giroletti; K. Hara; T. Higuchi; A. Himmi; D. Howgill; C. Irmler; D. Jeans; A.B. Kaliyar; M. Karagounis; T. Kishishita; H. Krüger; A. Kumar; C. Lacasta; C. Marinas; M. Massa; L. Massaccesi; J. Mazorra de Cos; M. Minuti; A. Moggi; S. Mondal; F. Morel; K.R. Nakamura; Y. Okazaki; Y. Onuki; P. Pangaud; Y. Peinaud; H. Pham; B. Pilsl; L. Ratti; V. Re; E. Riceputi; I. Ripp-Baudot; G. Rizzo; L. Schall; C. Schwanda; B. Schwenker; M. Schwickardi; R. Sefri; J. Serrano; P. Stavroulakis; G. Traversi; I. Valin; V. Vobbilisetti; M. Vogt; S. Wang; M. Winter; D. Xu
• Keywords: DMAPS; Belle II; Belle II VTX; CMOS Pixel Sensor; Depleted Monolithic Active Pixel Sensor; DMAPS; Vertex detector; Particle tracking detectors; Radiation-hard detectors; OBELIX; Trigger; 500; temperature; BELLE; trigger; detector, pixel; 530; Depleted Monolithic Active Pixel Sensor; Radiation-hard detector; Particle tracking detector; CMOS Pixel Sensor; Trigger; analog-to-digital converter; vertex detector, upgrade; [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]; Particle tracking detectors; Vertex detector; Belle II; Belle II VTX; tracking detector; OBELIX; semiconductor detector, pixel; performance; Radiation-hard detectors

The OBELIX depleted monolithic active CMOS pixel sensor (DMAPS) is currently developed for the upgrade of the vertex detector of the Belle II experiment located at Tsukuba/Japan. The pixel matrix of OBELIX is inherited from the TJ-Monopix2 chip, but the periphery includes additional features to improve performance and allow the integration into a larger detector system. The new features include a trigger unit to process trigger signals, a precision timing module and a possibility to transmit low granularity hit information with low latency to contribute to the Belle II trigger. Additionally, low dropout voltage regulators and an ADC to monitor power consumption and substrate temperature is developed. This paper will focus on the trigger contribution capabilities of the OBELIX chip.