Two different depleted monolithic cmos sensors with active pixels ( dmaps ) were used and tested prototypes that have a fully synchronous column-drain readout architecture: lf-monopix and tj-monopix. These chips are a segment of research papers on a suitable implementation of https://18comix.org cmos dmaps for the internal tracker hl-lhc atlas. Lf-monopix was built using a 150nm cmos process on a canvas with excellent