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Development of Low-Noise Front-End ASIC for Hybrid CdTe Pixel Detectors

Author:
Sato, Goro   Kishishita, Tetsuichi   Ikeda, Hirokazu   Sakumura, Takuto   Takahashi, Tadayuki  


Journal:
IEEE Transactions on Nuclear Science


Issue Date:
2011


Abstract(summary):

A front-end ASIC with spectroscopic capability was developed to construct a prototype CdTe pixel detector for future use in focusing hard X-ray telescopes. The ASIC is designed for a hybrid configuration, where each CdTe sensor pixel is vertically connected to a corresponding pixel cell fabricated in the readout ASIC. The readout chip consists of a 12 x 12 matrix of identical 270 x 270 mu m(2) m pixel cells, and was implemented with TSMC 0.35 mu m CMOS technology. The low noise performance achieved an equivalent noise charge distribution of 50 +/- 10 e(-). A CdTe pixel detector was mounted on the ASIC using an In/Au-stud bump-bonding technique. The detector was operated in self-trigger mode, and showed good spectral performance with energy resolution of 870 eV (FWHM) at 59.5 keV.


Page:
1370-1375


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