R&D on monolithic active pixel sensors (MAPS): Towards large-area CMOS sensors for particle physics

We are developing CMOS Monolithic Active Pixel Sensors for particle physics. A family of sensors, RAL_HEPAPS, has been developed. The first three sensors of this family were parametric test sensors, on which different types of pixel architectures were integrated. These sensors were designed, manufactured and tested and recent results obtained by our collaboration will be briefly reviewed. The latest sensor in the family, RAL_HEPAPS4, is the first step towards a large-area sensor as required for particle physics. It has 1026×384 pixels with a pixel pitch of 15 μm, for a total sensing area of 15.39×5.76 mm2. The line rate can be in excess of 5 MHz, which, for column parallel readout, would yield an equivalent 76 μs full frame readout time. Three different versions of the RAL_HEPAPS4 were produced, with the same global architecture but with different diode structures. The design and simulated performances will be reviewed.