Development of a low-noise analog front-end ASIC for CdTe detectors

This paper describes the recent development of a low-noise analog front-end ASIC for CdTe detectors. The ASIC is designed on the basis of the Open-IP LSI project led by JAXA and implemented using TSMC 0.35- μ m CMOS technology. The ASIC contains eight identical channels, each of which includes a cha...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2007-10, Vol.580 (3), p.1363-1371
Main Authors: Kishishita, Tetsuichi, Ikeda, Hirokazu, Kiyuna, Tatsuya, Tamura, Ken-ichi, Nakazawa, Kazuhiro, Takahashi, Tadayuki
Format: Article
Language:English
Subjects:
Analog front-end
ASIC
CdTe
Gamma ray
Low noise
Open-IP
X-ray
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Summary:This paper describes the recent development of a low-noise analog front-end ASIC for CdTe detectors. The ASIC is designed on the basis of the Open-IP LSI project led by JAXA and implemented using TSMC 0.35- μ m CMOS technology. The ASIC contains eight identical channels, each of which includes a charge-sensitive amplifier, band-pass filters, and a sample-and-hold circuit. Preliminary testing of the ASIC achieved noise performance of 188 e - + 7.5 e - / pF . In order to verify the low-noise characteristics, the ASIC was connected to a guard-ring-equipped CdTe diode detector with dimensions of 2.4 × 2.4 mm and having a thickness of 0.5 mm. As a result, the gamma-ray spectra of radioactive sources were obtained with good energy resolutions of 2.51 and 2.35 keV (FWHM) for gamma rays of 59.5 and 122 keV, respectively, at room temperature.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2007.07.003