Development of ASIC for Si/CdTe detectors in radioactive substance visualizing system

Sep 2, 2013, 2:30 PM
Dahlia (B2F) (International Conference Center Hiroshima)

Dahlia (B2F)

International Conference Center Hiroshima

1-5 Nakajima-cho Naka-ku, Hiroshima Japan
POSTER Electronics Poster


Atsushi Harayama (Japan Aerospace Exploration Agency)


We report on the recent development of a 64-channel analog front-end ASIC for a new gamma-ray imaging system to visualize radioactive substances. The imaging system employs a novel Compton camera which consists of silicon and cadmium telluride (CdTe) detectors. The ASIC aims for the readout of pixel /pad detectors utilizing Si/CdTe as detector materials, and the dynamic range from 100 keV to a few MeV. The readout chip consists of 64 identical signal channels and was implemented with the X-FAB 0.35 um CMOS technology. Each channel contains a charge-sensitive amplifier, pole-zero cancellation circuit, low-pass filter, comparator, and sample-hold circuit together with a Wilkinson-type A-to-D converter. We observed an equivalent noise charge of ~ 500 e- and a noise slope of ~5 e-/pF. We also report on the performance test when connected to Schottky CdTe diodes.

Primary author

Atsushi Harayama (Japan Aerospace Exploration Agency)


Dr Goro Sato (Japan Aerospace Exploration Agency) Prof. Hirokazu Ikeda (Japan Aerospace Exploration Agency) Dr Shin Watanabe (Japan Aerospace Exploration Agency) Dr Shin’ichiro Takeda (Japan Aerospace Exploration Agency) Prof. Tadayuki Takahashi (Japan Aerospace Exploration Agency)

Presentation materials