Rad-hard vertical JFET switch for the HV-MUX system of the ATLAS upgrade Inner Tracker

P. Fernández-Martínez, M. Ullán, D. Flores, S. Hidalgo, D. Quirion, D. Lynn

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10 Citations (Scopus)


© 2016 IOP Publishing Ltd and Sissa Medialab srl. This work presents a new silicon vertical JFET (V-JFET) device, based on the trenched 3D-detector technology developed at IMB-CNM, to be used as a switch for the High-Voltage powering scheme of the ATLAS upgrade Inner Tracker. The optimization of the device characteristics is performed by 2D and 3D TCAD simulations. Special attention has been paid to the on-resistance and the switch-off and breakdown voltages to meet the specific requirements of the system. In addition, a set of parameter values has been extracted from the simulated curves to implement a SPICE model of the proposed V-JFET transistor. As these devices are expected to operate under very high radiation conditions during the whole experiment life-time, a study of the radiation damage effects and the expected degradation of the device performance is also presented at the end of the paper.
Original languageEnglish
Article numberC01043
JournalJournal of Instrumentation
Issue number1
Publication statusPublished - 20 Jan 2016


  • Large detector systems for particle and astroparticle physics
  • Radiation-hard electronics
  • Voltage distributions


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