ATLAS ITk Pixel Detector Overview

In this work an overview of the layout and current status development ITk Pixel detector is given. For HL-LHC upgrade ATLAS Inner Detector replaced by all-silicon system. The will consist 5 barrel layers a number rings, resulting in about 14 m 2 instrumented area. Due to huge non-ionising fluence (1×10 16 neq/cm ) ionising dose (5 MGy), two innermost layers, with 3D pixel sensors (L0) 100 μ thin planar (L1) be after years operation. All hybrid modules read out novel ASICs, implemented 65 nm CMOS technology, bandwidth up Gb/s. Data transmitted optically off-detector readout To save material servicing cables, ASICs are serially powered. Large-scale prototyping programs being carried all sub-systems.