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http://dx.doi.org/10.6109/jkiice.2007.11.2.330

Analysis of Leakage Current of a Laser Diode by Equivalent Circuit Model  

Choi, Young-Kyu (신라대학교 전자공학과)
Kim, Ki-Rae (신라대학교 전자공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.11, no.2, 2007 , pp. 330-336 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 tern 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;
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