CMOS monolithic pixel sensors based on the column-drain architecture for the HL-LHC upgrade

Depleted Monolithic Active Pixel Sensors (DMAPS) constitute a promising low cost alternative for the outer layers of the ATLAS experiment Inner Tracker (ITk). Realizations in modern, high resistivity CMOS technologies enhance their radiation tolerance by achieving substantial depletion of the sensing volume. Two DMAPS prototypes that use the same column-drain readout architecture and are based on different sensor implementation concepts named LF-Monopix and TJ-Monopix have been developed for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC). LF-Monopix was fabricated in the LFoundry 150 nm technology and features pixel size of 50 x 250 mu m(2) and large collection electrode opted for high radiation tolerance. Detection efficiency up to 99% has been measured after irradiation to 1.10(15) n(eq)/cm(2). TJ-Monopix is a large scale (1 x 2 cm(2)) prototype featuring pixels of 36 x 40 mu m(2 )size. It was fabricated in a novel TowerJazz 180 nm modified process that enables full depletion of the sensitive layer, while employing a small collection electrode that is less sensitive to crosstalk. The resulting small sensor capacitance (<= 3 fF) is exploited by a compact, low power front end optimized to meet the 25 ns timing requirement. Measurement results demonstrate the sensor performance in terms of Equivalent Noise Charge (ENC) approximate to 11e(-), threshold approximate to 300 e(-), threshold dispersion approximate to 30 e(-) and total power consumption lower than 120 mW/cm(2).