We have been developing monolithic active pixel sensors, named ``XRPIX'', based on the silicon-on-insulator (SOI) pixel technology for future X-ray astronomy satellites. XRPIX has the function of event trigger and hit address outputs. This function allows us to read out analog signals only of hit pixels on trigger timing, which is referred to as the event-driven readout mode. Recently, we processed ``XRPIX5b'' with the largest imaging area of 21.9~mm × 13.8~mm in the XRPIX series. X-ray spectra are successfully obtained from all the pixels, and the readout noise is 46~e−~(rms) in the frame readout mode. The gain variation was measured to be 1.2\%~(FWHM) among the pixels. We successfully obtain the X-ray image in the event-driven readout mode.
@article{arxiv.1904.12571,
title = {Evaluation of Kyoto's Event-Driven X-ray Astronomical SOI Pixel Sensor with a Large Imaging Area},
author = {Hideki Hayashi and Takeshi Go Tsuru and Takaaki Tanaka and Hiroyuki Uchida and Hideaki Matsumura and Katsuhiro Tachibana and Sodai Harada and Ayaki Takeda and Koji Mori and Yusuke Nishioka and Nobuaki Takebayashi and Shoma Yokoyama and Kohei Fukuda and Yasuo Arai and Ikuo Kurachi and Shoji Kawahito and Keiichiro Kagawa and Keita Yasutomi and Sumeet Shrestha and Syunta Nakanishi and Hiroki Kamehama and Takayoshi Kohmura and Kouichi Hagino and Kousuke Negishi and Kenji Oono and Keigo Yarita},
journal= {arXiv preprint arXiv:1904.12571},
year = {2019}
}