Performance of monolithic analog pixel test structure with operational amplifier

The ALICE Collaboration at CERN foresees to replace, during the LHC LS3, the innermost three layers of the ALICE Inner Tracking System (ITS2) with a new vertex detector composed of bent and ultra-thin monolithic silicon sensors. In this work, the preliminary performance studies of the Analog Pixel Test Structure with an Operational Amplifier output buffer (APTS OPAMP), produced in the 65 nm TowerJazz Panasonic Semiconductor Company (65 nm TPSCo) process, are presented. Results obtained from measurement campaigns with a 55Fe source will be illustrated and discussed. They represent the first step through the validation of the technology and the premise of subsequent in-beam measurements at the Super Proton Synchrotron (SPS) at CERN.