Browse > Article
http://dx.doi.org/10.6109/jkiice.2007.11.2.322

A Design of Single Pixel Photon Counter for Digital X-ray Image Sensor  

Baek, Seung-Myun (창원대학교)
Kim, Tae-Ho (창원대학교)
Kang, Hyung-Geun (창원대학교)
Jeon, Sung-Chae (한국전기연구원)
Jin, Seung-Oh (한국전기연구원)
Huh, Young (한국전기연구원)
Ha, Pan-Bong (창원대학교)
Park, Mu-Hun (창원대학교)
Kim, Young-Hee (창원대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.11, no.2, 2007 , pp. 322-329 More about this Journal
Abstract
A single pixel photon counting type image sensor which is applicable for medical diagnosis with digitally obtained image and industrial purpose has been designed with $0.18{\mu}m$ triple-well CMOS process. The designed single pixel for readout chip is able to be operated by single supply voltage to simplify digital X-ray image sensor module and a preamplifier which is consist of folded cascode CMOS operational amplifier has been designed to enlarge signal voltage(${\Delta}Vs$), the output voltage of preamplifier. And an externally tunable threshold voltage generator circuit which generates threshold voltage in the readout chip has been newly proposed against the conventional external threshold voltage supply. In addition, A dark current compensation circuit for reducing dark current noise from photo diode is proposed and 15bit LFSR(Linear Feedback Shift Resister) Counter which is able to have high counting frequency and small layout area is designed.
Keywords
X-ray image sensor; single photon counting; preamplifier; comparator; threshold voltage generator; 15bit LFSR counter;
Citations & Related Records
연도 인용수 순위
  • Reference
1 지은미, 김근섭, 이제호 et. al., '의료영상 정보 시스템,' 전자공학회지, 제20권 6호, pp. 701-716
2 http://www.cis.rit.edu
3 P.Horowitz, W.Hill:The Art of Electronics, Cambridge University Press
4 Gyu-Ho Lim et aI., 'A CMOS Bandgap Reference Voltage/Current Bias Generator And Its Responses for Temperature and Radiation,' Proc. IEEK Summer Conference, 제26권 제1호, pp.1093-1096, July 2003
5 Tom Francke et al., 'Dose reduction in medical X-ray imaging using noise free photon counting,' Nucl.Instr. and Meth. A 471(2001)
6 이승훈, 김범섭, 송민규, 최중호 'CMOS 아날로그/혼성모드 집적시스템 설계(상),' 시그마 프레스, 1999년
7 Kapnistis, C., Msiakos,K. and Haralabidis, N.,' A Small Area Charge Sensitive Readout Chain with a Dual Mode of Operation,' Analog Integrated Circuits and Signal Processing ,27, 39-48, 2001   DOI
8 B. Mikulec. et al., 'Characterisation of a single photon counting pixel system for imaging of low-contrast objects,' Nucl. Instr. and Meth. A 458(2001) 352-359   DOI   ScienceOn
9 FREDRIK EDLING, 'A pixel readout chip for medical X-ray imaging,' LICENTIAlE THESIS. Uppsala Univ. 2003