卒業生とその進路

Integrated circuits employing non-linear dynamics of coupled single-electron devices


キコンボ アンドリュー キリンガ

2009 年度 卒 /博士(工学)
平成21年度 日本学術振興会特別研究員

博士論文の概要

This thesis aims at establishing novel signal processing architectures for single-electron devices.

The present trend in improving the performance of silicon LSIs has been primarily as a result of the continuous scaling of CMOS devices. The need to scale transistors has led to improvement of fabrication technologies. With the advamced LSI fabrication technologies, research on fabrication of minute nano scale structures (devices) has attracted a lot of attention. Such devices include nano wires, quantum nano dots and single-electron devices.

Single-electron devices utilize quantum-mechanical effects to control transport of electrons at the single level. Thus single-electron devices inherently operate with minimum low power dissipation. Additionally, owing to the minute physical sizes of single-electron devices, they are considered as potential devices in implementing parallel-based information paradigms that would require high device densities.

Single-electron devices operate on different principles as compared to the conventional MOSFET devices. Therefore to employ them in signal processing systems, there in need to establish new circuit architecture frame works that fully utilize their properties. This research aims at exploiting both dynamical and structural properties of single-electron devices toward establishing LSI platforms for nano devices.

This research starts with investigating non-linear characteristics of coupled single-electron devices. Single-electron devices portray interesting non-linear dynamics: a single-electron device shows relaxation oscillations, while a double-oscillator system (two single-electron oscillators coupled through a capacitor) have attractors of oscillation that are independent of initial node voltage conditions. A quadruple oscillator system (two capacitively coupled double-oscillator systems) show multi periodic oscillations. Furthermore, by coupling single-electron devices, one can control the flow of tunneling events within the device network.

By combining the above non-linear dynamics with the structural properties, we proposed a two-dimensional photon position detecting circuit, and evaluated its performance.Secondly, by obtaining hints from neuronal systems, we proposed two bio-inspired LSI circuits: an edge detection circuit and a motion detector circuit. The thesis also discusses the implications of device fabrication mismatches and environmental noises in fabricating the two bio-inspired circuits. Instead of getting rid of such noises, we propose a novel method where such noises are actively utilized to improve the performance of LSI circuits.

学術論文

  1. Kikombo A.K., Asai T., and Amemiya Y., "Neuro-morphic circuit architectures employing temporal noises and device fluctuations to improve signal-to-noise ratio in a single-electron pulse-density modulator," International Journal of Unconventional Computing, vol. 7, no. 1-2, pp. 53-64 (2011).
  2. Kikombo A.K., Tabe M., and Amemiya Y., "Photon position sensor consisting of single-electron circuits," Nanotechnology, vol. 20, no. 40, pp. 405209/1-7 (2009).
  3. Kikombo A.K., Asai T., Oya T., Schmid A., Leblebici Y., and Amemiya Y., "A neuromorphic single-electron circuit for noise-shaping pulse-density modulation," International Journal of Nanotechnology and Molecular Computation, vol. 1, no. 2, pp. 80-92 (2009).
  4. Kikombo A.K., Schmid A., Asai T., Leblebici Y., and Amemiya Y., "A bio-inspired image processor for edge detection with single-electron circuits," Journal of Signal Processing, vol. 13, no. 2, pp. 133-144 (2009).
  5. Kikombo A.K., Asai T., and Amemiya Y., "An elementary neuro-morphic circuit for visual motion detection with single-electron devices based on correlation neural networks," Journal of Computational and Theoretical Nanoscience, vol. 6, no. 1, pp. 89-95 (2009).
  6. Kikombo A.K., Hirose T., Asai T., and Amemiya Y., "Non-linear phenomena in electronic systems consisting of coupled single-electron oscillators," Chaos, Solitons and Fractals, vol. 37, no. 1, pp. 100-107 (2008).
  7. Kikombo A.K., Oya T., Asai T., and Amemiya Y., "Discrete dynamical systems consisting of single-electron circuits," International Journal of Bifurcation and Chaos, vol. 17, no. 10, pp. 3613-3617 (2007).

書籍/チャプター

  1. Kikombo A.K., "Neuromophic LSI Architectures consisting of single-electron devices -- Edge detection and extraction with single-electron circuits --," Vision Sensors and Edge Detection, Sciyo (2011).
  2. Kikombo A.K., Asai T., and Amemiya Y., "Exploiting temporal noises and device fluctuations in enhancing fidelity of pulse-density modulator consisting of single-electron neural circuits," Neural Information Processing, Leung C.-S., Lee M., and Chan J.H., Eds., Lecture Notes in Computer Science, vol. 5864, pp. 384-391, Springer Berlin / Heidelberg (2009).

招待講演/セミナー

  1. Kikombo A.K. and Asai T., "Neuro-morphic circuit architectures employing temporal noises and device fluctuations to enhance signal-to-noise ratio in pulse-density modulation," Proceedings of the 4th International Workshop on Natural Computing, pp. 37-46, Himeji International Exchange Center, Himeji, Japan (Sep. 23-25, 2009).
  2. Kikombo A.K., "Circuit architectures for Beyond CMOS electronic devices: Learning from biological systems toward creating robust electronic systems with fault-prone building blocks," Faculty Seminar in National Institute of Standards and Technology, Quantum Processes and Metrology Group, Maryland, U.S.A. (Jun. 22, 2009).

国際会議

  1. Kikombo A.K., Asai T., and Amemiya Y., "Single-electron pulse-density modulation circuits employing device fabrication mismatches and temporal noises to achieve high signal to noise ratio," Proceedings of the 3rd International Symposium on Global COE Program of Center for Next-Generation Information Technology Based on Knowledge Discovery and Knowledge Federation, p. xvii, Sapporo, Japan (Jan. 18-20, 2010).
  2. Kikombo A.K., Asai T., and Amemiya Y., "Morphic circuit architectures for beyond CMOS LSIs using failure-prone nano-electronic devices," Proceedings of the 3rd International Symposium on Global COE Program of Center for Next-Generation Information Technology Based on Knowledge Discovery and Knowledge Federation, pp. 254-256, Sapporo, Japan (Jan. 18-20, 2010).
  3. Kikombo A.K., Asai T., and Amemiya Y., "Bio-inspired single-electron circuit architectures exploiting thermal noises and device fluctuations to enhance signal transmission fidelity," Proceedings of the 2009 International Symposium on Intelligent Signal Processing and Communication Systems, pp. 429-432, Kanazawa, Japan (Dec. 7-9, 2009).
  4. Kikombo A.K., Asai T., and Amemiya Y., "Exploiting temporal noises and device fluctuations in enhancing fidelity of pulse-density modulator consisting of single-electron neural circuits," Proceedings of the 16th International Conference on Neural Information Processing, pp. 384-391, Bangkok, Thailand (Dec. 1-5, 2009).
  5. Kikombo A.K., Asai T., and Amemiya Y., "Pulse-density modulation with an ensemble of single-electron circuits employing neuronal heterogeneity to achieve high temporal resolution," Proceedings of the 4th International Conference on Nano-Networks, pp. 51-56, Luzern, Switzerland (Oct. 18-20, 2009).
  6. Kikombo A.K., Asai T., and Amemiya Y., "Noise-driven architectures toward beyond CMOS LSIs with failure-prone nano-electronic devices," Proceedings of the 14th International Commercialization of Micro and Nano Systems Conference, p. 18, Copenhagen, Denmark (Aug. 30-Sep. 4, 2009).
  7. Kikombo A.K., Asai T., Oya T., Schmid A., Leblebici Y., and Amemiya Y., "A pulse-density modulation circuit exhibiting noise shaping with single-electron neurons," Proceedings of the 2009 International Joint Conference on Neural Networks, pp. 1600-1605, Atlanta, U.S.A. (Jun. 14-19, 2009).
  8. Kikombo A.K., Asai T., and Amemiya Y., "Fault-tolerant architectures for single-electronic circuits based on neural networks," Proceedings of the 2nd International Symposium on Global COE Program of Center for Next-Generation Information Technology Based on Knowledge Discovery and Knowledge Federation, pp. 275-276, Sapporo, Japan (Jan. 20-21, 2009).
  9. Kikombo A.K., Schmid A., Asai T., Leblebici Y., and Amemiya Y., "Fault-tolerant architectures for nanoelectronic circuits employing simple feed-forward neural networks without learning," Proceedings of the 15th International Conference on Neural Information Processing of the Asia-Pacific Neural Network Assembly, p. 328, Auckland, New Zealand (Nov. 25-28, 2008).
  10. Kikombo A.K., Asai T., and Amemiya Y., "An insect vision-based single-electron circuit performing motion detection," Proceedings of the 2008 Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices, pp. 159-164, Sapporo, Japan (Jul. 9-11, 2008).
  11. Kikombo A.K., Asai T., and Amemiya Y., "A neuromorphic circuit for motion detection with single-electron devices based on correlation neural networks," The 2008 IEEE Silicon Nanoelectronics Workshop, #P1-31, Honolulu, U.S.A. (Jun. 15-16, 2008).
  12. Kikombo A.K., Schmid A., Asai T., Leblebici Y., and Amemiya Y., "Implementation of early vision model for edge extraction with single-slsecton devices," Proceedings of the 12th International Conference on Cognitive and Neural Systems, p. 125, Boston, U.S.A. (May 14-17, 2008).
  13. Kikombo A.K., Asai T., and Amemiya Y., "Morphic approaches toward establishing emerging image processing architectures for Beyond CMOS nano-electronic devices," The 4th International Nanotechnology Conference on Communications and Cooperation, Japan Session Poster #1, Tokyo, Japan (Apr. 14-17, 2008).
  14. Kikombo A.K., Schmid A., Asai T., Leblebici Y., and Amemiya Y., "Toward a single-electron image processor for edge detection based on the inner retina model," Proceedings of the 2008 RISP International Workshop on Nonlinear Circuits and Signal Processing, pp. 267-270, Gold Coast, Australia (Mar. 6-8, 2008).
  15. Kikombo A.K., Asai T., Hirose T., and Amemiya Y., "Neuromorphic nano-electronic circuits performing edge enhancement with single-electron devices," Proceedings of the 2008 International Symposium on Global COE Program of Center for Next-Generation Information Technology based on Knowledge Discovery and Knowledge Federation, pp. 137-138, Sapporo, Japan (Jan. 22-23, 2008).
  16. Kikombo A.K., Schmid A., Leblebici Y., Asai T., and Amemiya Y., "A bio-inspired image processor for edge detection with single-electron circuits," 2007 International Semiconductor Device Research Symposium, #TA3-04, Maryland, U.S.A. (Dec. 12-14, 2007).
  17. Kikombo A.K., Tabe M., and Amemiya Y., "Photon position detector consisting of single-electron devices," Extended Abstract of the 2007 International Conference on Solid State Devices and Materials, pp. 1114-1115, Ibaraki, Japan (Sep. 18-21, 2007).
  18. Kikombo A.K., Hirose T., Asai T., and Amemiya Y., "Multi-valued logic circuits consisting of single-electron devices," Proceedings of the 2007 Silicon Nanoelectronics Workshop, pp. 81-82, Kyoto, Japan (Jun. 10-11, 2007).
  19. Kikombo A.K., Hirose T., Asai T., and Amemiya Y., "Non-linear dynamics of coupled single-electron oscillator systems," Collected Papers of the 4th International Symposium on Ubiquitous Knowledge Network Environment, p. 72, Sapporo, Japan (Mar. 5-7, 2007).
  20. Kikombo A.K., Hirose T., Asai T., and Amemiya Y., "Non-linear dynamical systems consisting of single-electron oscillators," Proceedings of the 14th International Workshop on Nonlinear Dynamics of Electronic Systems, pp. 81-84, Dijon, France (Jun. 6-9, 2006).
  21. Kikombo A.K., Asai T., and Amemiya Y., "Single-electron discrete dynamical systems," Proceedings of the 3rd International Symposium on Ubiquitous Knowledge Network Environment, p. 47, Sapporo, Japan (Feb. 28-Mar. 1, 2006).
  22. Kikombo A.K., Oya T., Asai T., and Amemiya Y., "Discrete dynamical systems consisting of single-electron circuits," Proceedings of the 13th International IEEE Workshop on Nonlinear Dynamics of Electronic Systems, S13, Potsdam, Germany (Sep. 18-22, 2005).

国内学会

  1. Kikombo A.K., 浅井 哲也, 雨宮 好仁, "A design methodology for multi-valued logiccircuits with single-electron tunneling devices," 北海道大学情報科学研究科 若手研究者支援のための産学協同GCOEシンポジウム, P2-05, (札幌), 2008年10月.
  2. Kikombo A.K., Schmid A., 浅井 哲也, Leblebici Y., 雨宮 好仁, "Toward a bio-inspired image processor for edge extraction with single-electron devices," 電子情報通信学会 ニューロコンピューティング研究会, (佐賀), 2007年11月.
  3. Kikombo A.K., 雨宮 好仁, 田部 道晴, "単電子振動子ネットワークによるフォトン位置検出センサ," 応用物理学会秋季大会, (札幌), 2007年9月.
  4. Kikombo A.K., 廣瀬 哲也, 浅井 哲也, 雨宮 好仁, "単電子の位相ロッキングを利用した多値論理回路," 応用物理学会春季大会, (神奈川), 2007年3月.
  5. Kikombo A.K., 廣瀬 哲也, 浅井 哲也, 雨宮 好仁, "単電子結合振動子の非線形現象," 応用物理学会秋季大会, (滋賀), 2006年8月.
  6. Kikombo A.K., 大矢 剛嗣, 浅井 哲也, 雨宮 好仁, "単電子結合振動子による離散力学システムのダイナミクス," 応用物理学会春季大会, (東京), 2006年3月.