Digitale CMOS-Photodetektormatrizen mit integrierten A/D-Wandlern / Digital CMOS-Photodetector Matrices with Integrated A/D-Converters
In the field of radiological diagnostics, especially for the computed tomography a large number of photodetector elements (so called Pixels) is needed to assemble a large-area X-Ray-sensitive detector. These pixels should provide very high sensitivity, a very large dynamic range and a high signal-to-noise-ratio. Moreover, an in-pixel digitization of the signals is desired. To meet these specifications, a digital CMOS-Pixel comprising a special type of photodiode and a single-loop sigma-delta-modulator was developed, theoretically analyzed, fabricated and characterized. A matrix of 4x4 digital CMOS-pixels with each of them consuming an area of 1mm² has been fabricated. For further signal processing the concept of a multichannel decimation filter is presented.
Advisor:Prof. Bedrich J. Hosticka, Ph.D.; Prof. Dr.-Ing. Walter Geisselhardt
School:Universität Duisburg-Essen, Standort Essen
Source Type:Master's Thesis
Keywords:elektrotechnik universitaet duisburg essen
Date of Publication:03/16/2004