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The paper presents a prototype integrated circuit built in a 40 nm CMOS process for readout of a hybrid pixel detector. The core of the IC constitutes a matrix of pixels with the pixel size of m m. The paper explains the functionality and the architecture of the IC, which is designed to operate in both the standard single photon counting mode and the single photon counting mode with interpixel communication to mitigate negative effects of charge sharing. This article focuses on the measurement results of the IC operating in the standard single photon counting mode. The measured ENC is rms (for the peaking time of 48 ns), the gain is V , while the effective threshold dispersion is rms.

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Spectrally selective X-ray imaging provides improved material and tissue discrimination in comparison to state-of-art dual energy technologies that are commonly used in medical, industrial, and security applications. Cadmium Telluride (CdTe) and Cadmium Zinc Telluride (CdZnTe) based line scanners and small size two-dimensional X-ray sensors are emerging to the market, but the need for large scale panels is axiomatic. In this study, a seamless CdTe tile was developed that enables the implementation of large-sized, energy selective X-ray detector panels. The developed tile consists of a 64 × 64 pixel array (with 150 µm pitch) with a necessary substrate, ASIC, and CdTe crystal. The performance of the constructed seamless tile was characterized by focusing on spectral resolution and stability. In addition, a simple pixel trimming method that automates the equalization of each energy selective pixel was developed and analyzed.The obtained results suggest that the proposed concept of seamless (tileable) detector structures is a feasible approach to scale up panel sizes. The seamless tile shows comparable spectral resolution and stability performance with commercial CdTe sensors. The effect of tile to tile variation, the realization of a largescale panel, as well as the charge sharing performance, were left out of the scope and are to be studied in the next phase.

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