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IEICE TRANSACTIONS on Electronics

Design of a Smart CMOS Readout Circuit for Panoramic X-Ray Time Delay and Integration Arrays

Chul Bum KIM, Doo Hyung WOO, Byung Hyuk KIM, Hee Chul LEE

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Summary :

This paper presents a novel charge transfer CMOS readout circuit for an X-ray time delay and integration (TDI) array with a depth of 64. In this study, a charge transfer readout scheme based on CMOS technology is proposed to sum 64 stages of the TDI signal. In addition, a dead pixel elimination circuit is integrated within a chip, thus resolving the weakness of TDI arrays related to defective pixels. The proposed method is a novel CMOS solution for large depth TDI arrays. Thus, a high signal-to-noise ratio (SNR) can be acquired due to the increased TDI depth. The readout chip was fabricated with a 0.6 µm standard CMOS process for a 15064 CdTe X-ray detector array. The readout circuit was found to effectively increase the charge storage capacity up to 1.6108 electrons, providing an improved SNR by a factor of approximately 8. The measured equivalent noise charge resulting from the readout circuit was 1.68104 electrons, a negligible value compared to the shot noise from the detector.

Publication
IEICE TRANSACTIONS on Electronics Vol.E94-C No.7 pp.1212-1219
Publication Date
2011/07/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E94.C.1212
Type of Manuscript
PAPER
Category
Electronic Circuits

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