Data transmission architecture of the ALICE ITS3 stitched sensor prototype MOSAIX

The ALICE Collaboration will replace the three innermost layers of the Inner Tracker System (ITS) at the LHC with an innovative vertex detector. A single-die stitched monolithic pixel detector segment of 1.85 cm × 26.6 cm designed in 65 nm CMOS imaging technology will be used as a building block for these layers. The pixel detector segment consists of 144 data transmitters that are evenly distributed over the full area. The data communication is done via the 1.85 cm short edge of the detector. This contribution will focus on the architecture, challenges, and techniques used to aggregate up to 30.72 Gb/s of data flux arriving at the short edge of the chip and to send it off-chip.