Design of Nupix-H2- Monolithic Active Pixel Detector Circuit

Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2023-06-15

YIN, Rui HE, Rui HUANG, Ju YUAN, Hong ZHAO, Chengxin

Abstract： In nuclear physics and particle physics experiments, vertex and track detectors are mainly used to obtain the position, energy and time information of colliding particles. In recent years, MAPS (Monolithic Active Pixel sensors) have attracted wide attention in the field of detectors. Based on MAPS, a chip named Nupix-H2 will be designed using the domestic 130 nm CMOS process. The pixel array is 128 rows × 128 columns, and the individual pixel area is 22 μm × 22 μm. The readout mode is in Rolling Shutter row-by-row scanning mode, and the information of the pixel unit is output by column, and the scanning frequency is 40 MHz. In order to verify the feasibility of this chip, a test array of 1 row × 16 columns named is Nupix-H2- designed, and the energy information of this pixel array is read through a charge-sensitive amplifier, and the time information is measured by a counter, the system can achieve automatic reset. Simulation results show that the chip test array has an ENC of 30 e- or less, an energy resolution of ~5%, and a time resolution of 25 ns.

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