  The paper presents the simulation studies of 10 $\mu$m pitch microstrips on a
fully depleted monolithic active CMOS technology and describes their potential
to provide a new and cost-effective solution for particle tracking and timing
applications. The Fully Depleted Monolithic Active Microstrip Sensors (FD-MAMS)
described in this work, which are developed within the framework of the ARCADIA
project, are compliant with commercial CMOS fabrication processes. A TCAD
simulation campaign was performed in the perspective of an upcoming engineering
production run with the aim of designing FD-MAMS, studying their electrical
characteristics and optimising the sensor layout for enhanced performance in
terms of low capacitance, fast charge collection and low-power operation. A
very fine pitch of 10 $\mu$m was chosen to provide very high spatial
resolution. This small pitch still allows readout electronics to be
monolithically integrated in the inter-strip regions, enabling the segmentation
of long strips and the implementation of distributed readout architectures. The
effects of surface radiation damage expected for total ionising doses of the
order of 10 to 10$^5$ krad were also modelled in the simulations. The results
of the simulations exhibit promising performance in terms of timing and low
power consumption and motivate R&D efforts to further develop FD-MAMS; the
results will be experimentally verified through measurements on the test
structures that will be available at the beginning of 2021.
