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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...
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