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Kim, Seong-Jin
Bio-inspired Microsystems Lab (BiML)
Research Interests
  • Integrated analog-mixed signal circuit design, semiconductor sensor interface circuits

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Performance Evaluation of Pinning Potential Adjustment in Two-Dimensional/Three-Dimensional Image Sensor

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Title
Performance Evaluation of Pinning Potential Adjustment in Two-Dimensional/Three-Dimensional Image Sensor
Author
Kim, Seong-Jin
Issue Date
2012-10
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE ELECTRON DEVICE LETTERS, v.33, no.10, pp.1426 - 1428
Abstract
Standard pinned photodiode pixels with various pinning potentials are fully evaluated in two different operation modes: color image capture and depth map extraction. The diode pinning potential affects the quality of both color and depth images. On the one hand, it has an impact on the full well capacity and maximum signal-to-noise ratio (SNR) which determine the color pixel performance. On the other hand, it influences the charge transfer speed. Higher speed enables the use of higher modulation frequency which is beneficial to improve the depth accuracy in time-of-flight (TOF) measurement. Prototype pixel arrays with three types of pinning potentials have been fabricated in a 0.11-μm CMOS imaging technology by controlling the energy level of a buried implant layer. The pixels with low and high pinning potentials provide color images with 22- and 36-dB SNRs and 28 and 16 MHz of modulation frequencies in TOF operation with 40% demodulation contrast, respectively.
URI
https://scholarworks.unist.ac.kr/handle/201301/12288
URL
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6296678
DOI
10.1109/LED.2012.2210854
ISSN
0741-3106
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