Design of Nupix-A1, a Monolithic Active Pixel Sensor for heavy-ion physics

Authors：Yang, Ping; Niu, Xiaoyang; Zhou, Wei; Tian, Yuan; Wang, Qilin; Huang, Ju; Wang, Yongsheng; Fu, Fangfa; Cao, Bei; Xie, Ziyao; He, Rui; Yin, Rui; Zhao, Chengxin^*

Source：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2022, 1039: 167019.

DOI：10.1016/j.nima.2022.167019

• MAPS
• CMOS pixel sensor
• Column-parallel ADC
• Heavy-ion particle
• In-pixel circuit

A Monolithic Active Pixel Sensor (MAPS) named Nupix-A1 has been designed in a 130 nm process for the heavy-ion experiments at HIRFL and HIAF. The Nupix-A1 can simultaneously measure particle hits' energy, arrival time, and position. The Nupix-A1 consists of 128 x 64 pixels with the size of 30 mu m x 30 mu m. A configurable DAC array, which consists of four 10-bit voltage DACs and seven 8-bit current DACs, tunes the bias of the in-pixel circuit. The analog signal from the pixels in four adjacent columns is converted into a digital signal by an 11-bit column-parallel ADC. The digitized data is encoded, serialized, and transmitted by the 5 Gbps data transmission link. This paper will discuss the design of the Nupix-A1.

• Institution
  中国科学院研究生院