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Proceedings Paper

Development of a new readout system for the near-infrared detector of HONIR
Author(s): Takahiro Ui; Shigeyuki Sako; Takuya Yamashita; Hiroshi Akitaya; Koji S. Kawabata; Hidehiko Nakaya; Yuki Moritani; Ryosuke Itoh; Katsutoshi Takaki; Takeshi Urano; Issei Ueno; Takashi Ohsugi; Michitoshi Yoshida; Hikaru Nakao; Yasuhito Hashiba
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Paper Abstract

We developed a new readout system for the near-infrared detector VIRGO-2K (2kx2k HgCdTe array) installed in the optical-infrared simultaneous camera, HONIR, for the 1.5 m Kanata telescope at Higashi-Hiroshima observatory. The main goal of this development is to read out one frame within ~ 1 second through 16 output readout mode of the detector, in order to reduce the overhead time per exposure. The system is based on a CCD controller, Kiso Array Controller (KAC). We redesigned the analog part of KAC to fit VIRGO-2K. We employed a fully differential input circuit and a third order Bessel low-pass filter for noise reduction and a constant current system to improve the linearity of the detector. We set the cutoff frequency of the Bessel low-pass filter at the readout clock rate (120 kHz). We also set the constant current at 200 μA according to the data sheet of VIRGO-2K. We tested the new readout system at room temperature and confirmed that the low-pass filter works well as designed. The fluctuation of the current level of the constant current system is less than 2% for the typical output voltage range of VIRGO-2K (3.2-4.4 V). We measured the readout noise caused by the new readout system (connected to cooled multiplexer) and found that it is 30-40 μV rms, being comparable to or slightly higher than the typical readout noise of VIRGO-2K, ∼ 37 μV rms.

Paper Details

Date Published: 28 July 2014
PDF: 8 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476C (28 July 2014); doi: 10.1117/12.2055388
Show Author Affiliations
Takahiro Ui, Hiroshima Univ. (Japan)
Shigeyuki Sako, The Univ. of Tokyo (Japan)
Takuya Yamashita, National Astronomical Observatory of Japan (Japan)
Hiroshi Akitaya, Hiroshima Univ. (Japan)
Koji S. Kawabata, Hiroshima Univ. (Japan)
Hidehiko Nakaya, National Astronomical Observatory of Japan (Japan)
Yuki Moritani, Hiroshima Univ. (Japan)
Ryosuke Itoh, Hiroshima Univ. (Japan)
Katsutoshi Takaki, Hiroshima Univ. (Japan)
Takeshi Urano, Hiroshima Univ. (Japan)
Issei Ueno, Hiroshima Univ. (Japan)
Takashi Ohsugi, Hiroshima Univ. (Japan)
Michitoshi Yoshida, Hiroshima Univ. (Japan)
Hikaru Nakao, Hokkaido Univ. (Japan)
Yasuhito Hashiba, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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