Optimization of CMOS active pixels with high signal-to-noise ratio for high-resolution X-ray imaging

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As the pixel size becomes smaller, the signal level generated in pixel will decrease. This small signal is critically affected by noise, and so the image quality also degrades. Therefore, it is very important to increase signal-to-noise ratio of the pixel especially in high-resolution imaging applications. We developed a time-dependent theoretical noise model considering integration noise due to the shot noise generated in photodiode and readout noise due to the thermal and flicker noise arising from the readout transistors. The developed model can take the input variables such as photocurrent, capacitance of the photodiode, integration time, each size of the transistors comprising active pixels with 3 T structure, load capacitance, etc. To validate our noise model, test structures having several sizes of the source follower and selection transistor in 20 mu m pixel pitch have been realized using AMIS 0.5 mu m (2P/3 M) CMOS process. The pixel type is the n + /p and the fillfactor is around 30%. The results of the noise measurement are agree well with model calculations, and the optimum values of in-pixel components can be extracted using this developed noise model. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2008-06
Language
English
Article Type
Article; Proceedings Paper
Keywords

LOW-LIGHT LEVELS; TEMPORAL NOISE; SENSORS

Citation

NUCLEAR INSTRUMENTS METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.591, no.1, pp.248 - 251

ISSN
0168-9002
URI
http://hdl.handle.net/10203/92687
Appears in Collection
NE-Journal Papers(저널논문)
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