This paper presents a novel pixel chip readout scheme: the Region-of-Interest Readout Circuit (ROIRC), which is designed for large area, large array pixel chips and Gas Pixel Detector (GPD). This design employs a sentinel pixel detection strategy, enabling rapid identification and prioritized readout of the pixel regions containing signal events. During the scanning readout of these signal events, ROIRC employs a Block-based readout approach, effectively minimizing the readout of non-signal pixels. The functionality of ROIRC has been successfully implemented on both the ASIC and FPGA platforms. In the tests of the ROIRC, the pixel chip embedded in the GPD is capable of detecting low-energy X-rays in the range of 2-10 keV and supports multiple event readouts, and the pixel chip can read out photo-electron signal events with the count rate up to 15k / (cm2 x s).
@article{arxiv.2511.15130,
title = {A Novel Pixel-Chip-Based Region-of-Interest Readout Circuit Design},
author = {Shi-Qiang Zhou and Li-Rong Xie and Dong Wang and Cheng Lian and Si-Ying Liu and Zi-Yi Zhang and Xiang-Ming Sun and Hong-Bang Liu and Chao-Song Gao and Jun Liu and Huan-Bo Feng and Di-Fan Yi},
journal= {arXiv preprint arXiv:2511.15130},
year = {2025}
}