Development of a 32-channel ASIC for an X-ray APD detector onboard the ISS

Makoto Arimoto*, Shohei Harita, Satoshi Sugita, Yoichi Yatsu, Nobuyuki Kawai, Hirokazu Ikeda, Hiroshi Tomida, Naoki Isobe, Shiro Ueno, Tatehiro Mihara, Motoko Serino, Takayoshi Kohmura, Takanori Sakamoto, Atsumasa Yoshida, Hiroshi Tsunemi, Satoshi Hatori, Kyo Kume, Takashi Hasegawa


研究成果: Article査読

3 被引用数 (Scopus)


We report on the design and performance of a mixed-signal application specific integrated circuit (ASIC) dedicated to avalanche photodiodes (APDs) in order to detect hard X-ray emissions in a wide energy band onboard the International Space Station. To realize wide-band detection from 20 keV to 1 MeV, we use Ce:GAGG scintillators, each coupled to an APD, with low-noise front-end electronics capable of achieving a minimum energy detection threshold of 20 keV. The developed ASIC has the ability to read out 32-channel APD signals using 0.35 μm CMOS technology, and an analog amplifier at the input stage is designed to suppress the capacitive noise primarily arising from the large detector capacitance of the APDs. The ASIC achieves a performance of 2099 e + 1.5 e/pF at root mean square (RMS) with a wide 300 fC dynamic range. Coupling a reverse-type APD with a Ce:GAGG scintillator, we obtain an energy resolution of 6.7% (FWHM) at 662 keV and a minimum detectable energy of 20 keV at room temperature (20 °C). Furthermore, we examine the radiation tolerance for space applications by using a 90 MeV proton beam, confirming that the ASIC is free of single-event effects and can operate properly without serious degradation in analog and digital processing.

ジャーナルNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
出版ステータスPublished - 2018 2月 21

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 器械工学


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