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Circuit Architecture for Photon Counting Pixel Detector with Thresholds Correction

Suliman Abdalla 1, Marwa Mekki 2, and Amin Babiker 3
1. Atomic Energy Commission, P.O. Box 3001, Khartoum, Sudan
2. Faculty of Engineering, University of Gazira, Wad Medani, Sudan
3. Faculty of Engineering, Alneelain University, Khartoum, Sudan
Abstract—In the hybrid pixel detectors, the detector and the readout circuit are constructed separately and then connected electrically by flip-chip bonding. This concept allows the same readout chip to operate using different sensor materials. In photon counting readout, by taking into account the noise around the signal, and other effects such as the variation of amplifier gain and the signal offset. To have a good efficiency for the signals charge, the comparator threshold setting is needed to be low enough. In this paper, a photon counting pixel detector readout with threshold correction is implemented as a solution for the missing counting of the signal due to the offset problem. The additional circuits needed for this architecture, leads to an increase in power consumption and only a marginal increase in circuit area. It is implemented in a 120nm CMOS process and the presented results are based on simulations.
Index Terms—threshold, photon, correction, pixel, noise, discriminator

Cite: Suliman Abdalla, Marwa Mekki, and Amin Babiker, "Circuit Architecture for Photon Counting Pixel Detector with Thresholds Correction," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 6, pp. 477-481, December 2015. doi: 10.12720/ijeee.3.6.477-481
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