  LF-Monopix1 and TJ-Monopix1 are depleted monolithic active pixel sensors
(DMAPS) in 150 nm LFoundry and 180 nm TowerJazz CMOS technologies respectively.
They are designed for usage in high-rate and high-radiation environments such
as the ATLAS Inner Tracker at the High-Luminosity Large Hadron Collider
(HL-LHC). Both chips are read out using a column-drain readout architecture.
LF-Monopix1 follows a design with large charge collection electrode where
readout electronics are placed inside. Generally, this offers a homogeneous
electrical field in the sensor and short drift distances. TJ-Monopix1 employs a
small charge collection electrode with readout electronics separated from the
electrode and an additional n-type implant to achieve full depletion of the
sensitive volume. This approach offers a low sensor capacitance and therefore
low noise and is typically implemented with small pixel size. Both detectors
have been characterized before and after irradiation using lab tests and
particle beams.
