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HEXITEC ASIC—a pixellated readout chip for CZT detectors

2009; Elsevier BV; Volume: 604; Issue: 1-2 Linguagem: Inglês

10.1016/j.nima.2009.01.046

1872-9576

L. Jones, P. Seller, Matthew D. Wilson, A.L. Hardie,

Advanced X-ray and CT Imaging

HEXITEC is a collaborative project with the aim of developing a new range of detectors for high-energy X-ray imaging. High-energy X-ray imaging has major advantages over current lower energy imaging for the life and physical sciences, including improved phase-contrast images on larger, higher density samples and with lower accumulated doses. However, at these energies conventional silicon-based devices cannot be used, hence, the requirement for a new range of high Z-detector materials. Underpinning the HEXITEC programme are the development of a pixellated Cadmium Zinc Telluride (CZT) detectors and a pixellated readout ASIC which will be bump-bonded to the detector. The HEXITEC ASIC is required to have low noise (20 electrons rms) and tolerate detector leakage currents. A prototype 20×20 pixel ASIC has been developed and manufactured on a standard 0.35 μm CMOS process.