Speakers
Description
The high energy physics community recently gained access to a 65 nm CMOS
imaging process, which enables a higher density of in-pixel logic in monolithic active pixel sensors (MAPS). To explore this novel technology, the H2M (Hybrid-to-Monolithic) test chip has been designed and manufactured. The design followed a digital-on-top design workflow and ports a hybrid pixel-detector architecture, with digital pulse processing in each pixel, into a monolithic chip. The chip matrix consists of 64×16 square pixels with a size of 35×35 um$^2$, and a total active area of ∼1.25 mm$^2$.
This contribution will introduce the H2M chip and cover its characterization in the test beam. A hit-detection efficiency above 99 % has been measured, unaffected by thinning samples down to 21 um. Additionally, a measured non-uniformity of the in-pixel response related to the size and location of the n-wells in the analog circuitry will be discussed, as well as its impact on time resolution.
Testing the chip revealed several peculiarities, rooted in the depth of the DAQ framework, configuration of the chip, reference systems, or analysis software. It is part of a successful testing campaign to find and solve this kind of issues and the lessons learned will be summarized as the final part of this contribution.
