Design and Characterization of a Monolithic Active Pixel Sensor in 0.25 μm Technology

Physics – Medical Physics

Scientific paper

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Vertex Detectors, Maps, Silicon

Scientific paper

Since few years Monolithic Active Pixel Sensors (MAPS) are actively developed all around the word and are becoming a valuable alternative to hybrid pixel sensors in high energy physics applications. Those sensors, designed using the standard technology for consumer electronics (CMOS), are integrating on the same substrate both the sensitive layer and the readout electronics; this is allowing very high granularity and excellent spatial resolution, limited material budget and easiness of integration. This paper is about the MimoRomal chip designed, produced and commissioned in 0.25 μm CMOS technology by the authors. The chip was submitted as a multiproject run to TSMC through the MOSIS consortium. The sensor design was meant to investigate which performance can be achieved in this scaled technology featuring a very narrow sensitive volume (the epitaxial layer) compared to other traditional hybrid detectors and to test the radiation hardening via enclosed transistors. The results of the chip characterization with radioactive sources are presented.

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