Development of a new readout system for the near-infrared detector of HONIR

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

doi:10.1117/12.2055388

28 July 2014 Development of a new readout system for the near-infrared detector of HONIR

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

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 91476C (2014) https://doi.org/10.1117/12.2055388
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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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, and Yasuhito Hashiba "Development of a new readout system for the near-infrared detector of HONIR", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91476C (28 July 2014); https://doi.org/10.1117/12.2055388

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