Design and Evaluation of a CMOS-Photosensor with In-Pixel Sigma-Delta Modulator for X-ray Computed Tomography

Christian Baumer,Stefan Eick,Roger Steadman,Gereon Vogtmeier,Michael Gnade,Armin Kemna,D Weiler

Montreux（2006）

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摘要

A multichannel SigmaDelta-type analog-to-digital converter has been designed for data readout in CT scanners. A test-structure with a 4 times 4 photodetector array has been fabricated in a 0.8 mum CMOS process. Aiming at an integrated solution towards a 'digital pixel', each sensor element is formed by a photodiode and a third-order SigmaDelta-modulator. The switched-capacitor circuitry has been realized as a fully differential-path design. Test measurements have been carried out and analyzed in terms of dynamic range and noise. Simulations on layout level have been performed. A digital post-processing scheme has been devised for decimation and low-pass filtering of the modulator outputs

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关键词

cmos image sensors,computerised tomography,photodetectors,photodiodes,sigma-delta modulation,switched capacitor networks,0.8 micron,cmos process,cmos-photosensor design,ct scanners,sigmadelta-type analog-to-digital converter,x-ray computed tomography,data readout,digital pixel,low-pass filtering,photodetector array,photodiode,sigma-delta modulator,switched-capacitor circuitry,sigma delta modulator,low pass filter,switched capacitor,dynamic range

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