کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1830848 | 1027486 | 2007 | 5 صفحه PDF | دانلود رایگان |

Aiming at a compact, cost-effective data readout for X-ray CT, a monolithic approach is presented where photosensor and parts of the analog-to-digital converter are located on the same substrate. In a special realization of the ‘digital pixel’, a test array of photodiodes and in-pixel Sigma–Delta modulators has been developed and produced in a standard 0.8μm CMOS process. The single-bit, discrete-time modulator is of third order and has feedforward topology. Test samples have been characterized with emphasis on noise performance and linearity. An off-chip, decimation and low-pass filter has been designed according to the special requirements of CT. Signal processing with oversampling ADCs is compared to conventional solutions for data readout in X-ray CT.
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 576, Issue 1, 11 June 2007, Pages 123–127