A reticle size CMOS pixel sensor dedicated to the STAR HFT

Abstract

ULTIMATE is a reticle size CMOS Pixel Sensor (CPS) designed to meet the requirements of the STAR pixel detector (PXL). It includes a pixel array of 928 rows and 960 columns with a 20.7 μm pixel pitch, providing a sensitive area of ∼ 3.8 cm2. Based on the sensor designed for the EUDET beam telescope, the device is a binary output sensor with integrated zero suppression circuitry featuring a 320 Mbps data throughput capability. It was fabricated in a 0.35 μm OPTO process early in 2011. The design and preliminary test results, including charged particle detection performances measured at the CERN-SPS, are presented.