Publications

Summary

• 1 book chapter

• 32 journal articles

• 53 conference papers

Book Chapters

1. I. Lee and Y. Lee, “Circuit Design in mm-Scale Sensor Platform for Future IoT Applications,” Chapter in Smart Sensors and Systems, C.-M. Kyung, H. Yasuura, Y. Liu, and Y.-L. Lin, editors, Springer Publishing Company, 2017. 

Journal Articles

1. Y. Li, Y. Kim and I. Lee, "A 5-mm2 , 4.7- uW Convolutional Neural Network Layer Accelerator for Miniature Systems," IEEE Transactions on Very Large Scale Integration Systems (TVLSI), Early Access, doi: 10.1109/TVLSI.2023.3324572.

2. D. Seo, M. Cho, M. Jeong, G. Shin, I. Lee, D. Blaauw, and Y. Lee, "An RC Delay-Based Pressure-Sensing System With Energy-Efficient Bit-Level Oversampling Techniques for Implantable IOP Monitoring Systems," IEEE J. Solid-State Circuits (JSSC), vol. 58, no. 10, Oct 2023. (Invited) 

3. H.-Y. Lee, C Lee, I. Lee, and Y. Chae, "A 0.033-mm2 21.5-to-119.4-aF Resolution Continuous-Time ΔΣ Capacitance-to-Digital Converter Achieving Parasitic Capacitance Immunity up to 480-pF," IEEE J. Solid-State Circuits (JSSC), vol. 57, no. 10, Oct 2022. (Invited) 

4. Y. Li, Y. Wu, X. Zhang, J. Hu, and I. Lee, "Energy-Aware Adaptive Multi-Exit Neural Network Inference Implementation for a Millimeter-Scale Sensing System, " IEEE Transactions on Very Large Scale Integration Systems (TVLSI), vol 30, no. 7, pp 849-859, July 2022..

5. I. Lee*, R. Hsiao*, Gordy Carichner, C.-W. Hsu, M. Wang, S. Shoouri, K. Ernst, T. Carichner, Y. Li, J. Lim, C. R. Julick. E. Moon, Y. Sun, J. Phillips, K. L. Montooth, D. A. Green II, H.-S. Kim, and D. Blaauw, "Tracking the Migration of the Monarch Butterflies with the World’s Smallest Computer," GetMobile: Mobile Comp. and Comm., vol. 26, no. 1, Mar. 2022 (* equally contributed).

6. E. A. Hamed*, J. Athas*, X. Zhang, N. Ashenden, and I. Lee, "A Low-Power GPIO-Based Size Sensor to Monitor the Imbibition of Corn Seeds Beneath Soil," MDPI Electronics, vol. 10, no. 19, Oct. 2021 (* equally contributed).

7. Y. Li*, Y. Gao*, M. Shao, J. T. Tonecha, Y. Wu, J. Hu, and I. Lee, "Implementation of Multi-Exit Neural-Network Inferences for an Image-Based Sensing System with Energy Harvesting," MDPI Journal of Low Power Electronic Application (JLPEA), vo.. 11, no. 3, Sep. 2021 (* equally contributed). 

8. E. A. Hamed and I. Lee, "Categorization and SEU Fault Simulations of Radiation-Hardened-by-Design Flip-Flops," MDPI Electronics, vol. 10, no. 13, June 2021. 

9. C. S. Bick*, I. Lee*, D. Blaauw, T. Coote, A. E. Haponski, and D. Ó Foighil, “Millimeter-sized smart sensors reveal that a solar refuge protects tree snail Partula hyalina from extirpation,” Communication Biology, vol. 4, no. 1, June 2021. (* equally contributed).

10. Y. Li, Y. E. A. Hamed, X. Zhang, D. Luna, J.-S. Lin, X. Liang, I. Lee, "Feasibility of Harvesting Solar Energy for Self-Powered Environmental Wireless Sensor Nodes," MDPI Electronics, vol. 9, no. 12, Dec. 2020.

11. Y. Peng, K. D. Choo, S. Oh, I. Lee, T. Jang, Y. Kim, J. Lim, D. Blaauw, and D. Sylvester, “An Efficient Piezoelectric Energy Harvesting Interface Circuit Using a Sense-and-Set Rectifier,” IEEE J. Solid-State Circuits, vol. 54, no. 12, pp. 3348-3361, Dec. 2019. (Invited).

12. P. Bollella, I. Lee, D. Blaauw, and E. Katz, “A Microelectronic Sensor Device Powered by a Small Implantable Biofuel Cell,” ChemPhysChem, Aug. 2019. (* equally contributed), (Highlighted as a very important paper).

13. E. Moon, I. Lee, D. Blaauw, and J. Phillips, “High-Efficiency Photovoltaic Modules on a Chip for Millimeter-Scale Energy Harvesting,” Progress in Photovoltaics: Research and Applications, vol 27, no. 6, pp 540-546, Mar. 2019.

14. M. Gamella*, I. Lee*, N. Guz, D. Blaauw, and E. Katz, “Bioelectronic Interface between Biomolecular Logic Systems and microelectronics,” International Journal of Unconvnetional Computing, vol. 14, no. 1, pp 27-41, Jan. 2018. (* equally contributed).

15. M. Choi, Y. Sui, I. H. Lee, Ryan Meredith, Y. Ma, G. Kim, D. Blaauw, Y. B. Gianchandani, and T. Li, “Autonomous Microsystems for Downhole Applications: Design Challenges, Current State, and initial Test Results,” Sensors, vol. 17, Sep. 2017.

16. I. Lee, S. Bang, Y. Kim, G. Kim, D. Sylvester, D. Blaauw, and Y. Lee, “A Wire-overhead-free Reset Propagation Scheme for Millimeter-scale Sensor Systems,” J. Semiconductor Technology and Science, vol. 17, no. 4, pp 524-533, Aug. 2017.

17. I. Lee, D. Sylvester, and D. Blaauw, “A Subthreshold Voltage Reference With Scalable Output Voltage for Low-Power IoT Systems,” IEEE J. Solid-State Circuits, vol. 52, no. 5, pp. 1443-1449, May. 2017.

18. X. Wu, Y. Shi, S. Jeloka, K. Yang, I. Lee, Y. Lee, D. Sylvester, and D. Blaauw, “A 20-pW Discontinuous Switched-Capacitor Energy Harvester for Smart Sensor Applications,” IEEE J. Solid-State Circuits, vol. 52, no. 4, pp. 972-984, Apr. 2017 (Invited).

19. I. Lee, Y-S Kuo, P. Pannuto, G. Kim, Z. Foo, B. Kempke, S. Jeong, Y. Kim, P. Dutta, D. Blaauw, and Y. Lee, “MBus: A Fully Synthesizable Low-power Portable Interconnect Bus for Millimeter-scale Sensor Systems,” J. Semiconductor Technology and Science, vol. 16, no. 6, pp 745-753, Dec. 2016. 

20. I. Lee, Y. Lee, D. Sylvester, and D. Blaauw, “Battery Voltage Supervisors for Miniature IoT Systems,” IEEE J. Solid-State Circuits (JSSC), vol. 51, no. 11, pp. 2743-2756, Nov. 2016.

21. S. Teran, E. Moon, W. Lim, G. Kim, I. Lee, D. Blaauw, and J. D. Phillips, “Energy Harvesting for GaAs Photovoltaics Under Low-Flux Indoor Lighting Conditions,” IEEE Tran. Electron Devices, vol. 63, no 7, pp. 2820-2825, Jul. 2016. 

22. I. Lee, D. Sylvester, and D. Blaauw, “A Constant Energy-Per-Cycle Ring Oscillator Over a Wide Frequency Range for Wireless Sensor Nodes,” IEEE J. Solid-State Circuits, vol. 51, no. 3, pp. 697-711, Mar. 2016.

23. S. Jeong, I. Lee, D. Blaauw, and D. Sylvester, “A 5.8 nW CMOS Wake-Up Timer for Ultra-Low-Power Wireless Applications,” IEEE J. Solid-State Circuits, vol. 50, no. 8, pp. 1754-1763, Aug. 2015 (Invited).

24. I. Lee, G. Kim, S. Bang, A. Wolfe, R. Bell, S. Jeong, Y. Kim, J. Kagan, M. Arias-Thode, B. Chadwick, D. Sylvester, D. Blaauw, and Y. Lee, “System-on-Mud: Ultra-Low Power Oceanic Sensing Platform Powered by Small-Scale Benthic Microbial Fuel Cells,” IEEE Tran. Circuits Syst. I, vol. 62, no. 4, pp 1126-1135, Apr. 2015.

25. I. Lee, G. Han, and Y. Chae, “A 2mW, 50 dB DR, 10 MHz BW 5Í Interleaved Bandpass Delta-Sigma Modulator at 50MHz IF,” IEEE Tran. Circuits Syst. I, vol. 62, no. 1, pp. 80-89, Jan. 2015.

26. Y. Chen, D. Jeon, Y. Lee, Y. Kim, Z. Foo, I. Lee, N. B. Langhals, G. Kruger, H. Oral, O. Berenfeld, Z. Zhang, D. Blaauw, and D. Sylvester, “An Injectable 64 nW ECG Mixed-Signal SoC in 65 nm for Arrhythmia Monitoring,” IEEE J. Solid-State Circuits, vol. 50, no. 1, pp. 375-390, Jan. 2015 (Invited).

27. Jeon, M. B. Henry, Y. Kim, I. Lee, Z. Zhang, D. Blaauw, D. Sylvester, “An Energy Efficient Full-Frame Feature Extraction Accelerator With Shift-Latch FIFO in 28 nm CMOS,” IEEE J. Solid-State Circuits, vol. 49, no. 5, pp. 1271-1284, May 2014.

28. M. H. Ghead, G. Chen, R. Haque, M.  Wieckowski, Y. Kim, G. Kim, Y. Lee, I. Lee, D. Fick, D. Kim, M. Seok, K. D. Wise, D. Blaauw, and D. Sylvester, “Circuits for a Cubic-Millimeter Energy-Autonomous Wireless Intraocular Pressure Monitor,” IEEE Tran. Circuits Syst. I, vol. 60, no. 12, pp. 3152-3162, Dec. 2013.

29. Z. Foo, D. M Devescery, M. Hassan, I. Lee, A. Madhavan, Y. S. Park, A. S. Rao, Z. Renner, N. E. Roberts, A. D. Schulman, V. S. Vinay, M. Wieckowski, D. Yoon, C. Schmidt, T. Schmid, P. Dutta, P. M. Chen, and D. Blaauw, "A Low-Cost Audio Computer for Information Dissemination Among Illiterate People Groups," IEEE Tran. Circuits Syst. I, vol. 60, no. 8, pp. 2039-2050, Aug. 2013 (Invited).

30. Y. Lee, S. Bang, I. Lee, Y. Kim, G. Kim, Mohammad G., Pat G, P. Dutta, D. Sylvester, and D. Blaauw, "A Modular 1 mm3 Die-Stacked Sensing Platform With Low Power I2C Inter-Die Communication and Multi-Modal Energy Harvesting," IEEE J. Solid-State Circuits, vol. 48, no. 1, pp. 229-243, Jan. 2013 (Invited).

31. J. Cheon, Y. Chae, D. Kim, S. Lim, I. Lee, H.-K Lee, D J. Kim, and G. Han, “Smart CMOS Image Sensor With High SBR and Subpixel Resolution for Light-Section-Based Range Finding,” IEEE Trans. Electron Devices (T-ED), vol. 56, no. 11, pp. 2546-2555, Nov. 2009.

32. J. Cheon, J. Lee, I. Lee, Y. Chae, Y. Yoo, and G. Han, “A Single-Chip CMOS Smoke and Temperature Sensor for an Intelligent Fire Detector,” IEEE Sensors journal ,vol. 9, no. 8, pp.914-921, Aug. 2009.

Conference Papers

1. A. Dey, A. Ali, A. Jain, I. Lee, and Z. Abbas, “A 162nW, 0.845pJ/step Resistance-to-Digital Converter for Miniature Battery-Powered Sensing Systems,” IEEE International Symposium on Circuit and Systems (ISCAS), May 2023.

2. S. Agarwal, S. B. Yerragudi, N. Dasarai, I. Lee, and Z. Abbas, “An 18.5nW, 62.9dB PSRR, Switched-Capacitor Bandgap Voltage Reference using Low Power Clock Generator Circuit for Biomedical Applications,” IEEE International Symposium on Circuit and Systems (ISCAS), May 2023.

3. B. Sahishnavi, S. Kumar, A. Ali, A. Dey, I. Lee, and Z. Abbas, “A 0.5V, pico-watt, 0.06%/V / 0.03%/V low supply sensitive current/voltage reference without using amplifiers and resistors,” IEEE International Symposium on Circuit and Systems (ISCAS), May 2023.

4. A. Huluvallay, A. Pullela, E. A. Hamed, A. Jain, N. Daasari, Z. Abbas, and I. Lee, “A 7 nW, 1 kHz, -40 – 170 °C Relaxation Oscillator with Switch-Leakage Compensation for Low-Power High-Temperature IoT Systems,” IEEE International Symposium on Circuit and Systems (ISCAS), May 2023.

5. D. Seo, M. Cho, M. Jeong, G. Shin, I. Lee, and Y. Lee, "A 0.24 mmHg (1σ) Resolution Half-Bridge-to-Digital Converter with RC Delay-Based Pressure Sensing and Energy-Efficient Bit-Level Oversampling Techniques for Implantable Miniature Systems," IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2022.

6. Y. Li and I. Lee, "A 36pW CMOS Voltage Reference With Independent TC and Output Level Calibration for Miniature Low-Power Systems," IEEE International Symposium on Circuit and Systems (ISCAS), June 2022.

7. V. Pullela, A. Huluvallay, A. Jain, I. Lee, and Z. Abbas "A 156pW Gate-Leakage Based Voltage/Current Reference for Low-Power IoT Systems ," IEEE International Symposium on Circuit and Systems (ISCAS), June 2022.

8. S. Shoouri, M. Yang, G. Carichner, Y. Li, E. A. Hamed, A. Deng, D. A. Green II, I. Lee, D. Blaauw, and H.-S. Kim, “Siamese Learning-Based Monarch Butterfly Localization,” IEEE Data Science & Learning Workshop (DSLW 2022), May 2022.. 

9. I. Lee*, R. Hsiao*, Gordy Carichner, C.-W. Hsu, M. Wang, S. Shoouri, K. Ernst, T. Carichner, Y. Li, J. Lim, C. R. Julick. E. Moon, Y. Sun, J. Phillips, K. L. Montooth, D. A. Green II, H.-S. Kim, and D. Blaauw, "mSAIL: Milligram-Scale Multi-Modal Sensor Platform for Monarch Butterfly Migration Tracking," ACM International Conference on Mobile Computing and Networking (MobiCom), Oct. 2021. (* equally contributed). Best Paper Award

10. S. Jeong, Y. Kim, Y. Li, and I. Lee, "A Millimeter-Scale Computing System with Adaptive Dynamic Load Power Tracking," IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2021.

11. Y. Li, E. Moon, J. Phillips, and I. Lee, "A Stacked-Photovoltaic-Cell Energy Harvester with >81% Indoor Light Harvesting Efficiency for Millimeter-Scale Energy-Autonomous Sensor Nodes," IEEE European Solid-State Circuits Conference (ESSCIRC), Sep. 2021. 

12. Y. Li, Y. Kim, E. Moon, J. Phillips, and I. Lee, "An Energy Autonomous Light Intensity Sensor for Monarch Butterfly Migration Tracking," IEEE European Solid-State Circuits Conference (ESSCIRC), Sep. 2021. 

13. Y. Li, Y. Wu, X. Zhang, E. Hamed, J. Hu, and I. Lee, "Developing a Miniature Energy-Harvesting-Powered Edge Device with Multi-Exit Neural Network," IEEE International Symposium on Circuit and Systems (ISCAS), May 2021. 

14. Y. Li and I. Lee, "An 111pW Voltage Reference with a Diode-Leakage-Decoupling Replica for High-Temperature Miniature IoT Systems," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2021.

15. M. Yang, R. Hsiao, G. Carichner, K. Ernst, J. Lim, D. A. Green II, I. Lee, D. Blaauw, and H.-S. Kim, “Migrating Monarch Butterfly Localization Using Multi-Modal Sensor Fusion Neural Networks,” IEEE European Signal Processing Conference (EUSIPCO), Jan. 2021.

16. J. Lim, E. Moon, M. Barrow, S. R. nason, P. R. Patel, P. G. Patil, S. Oh, I. Lee, H.-S. Kim, D. Sylvester, D. Blaauw, C. A. Chestek, J. Phillips, and T. Jang, "A 0.19×0.17mm2 Wireless Neural Recording IC for Motor Prediction with Near-Infrared-Based Power and Data Telemetry," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2020.

17. T. Kang, I. Lee, S. Oh, S, T. Jang, Y. Kim, H. Ahn, G. Kim, S.-U. Shin, S. Jeong, D. Sylvester, D. Blaauw, “A 1.7×4.1×2 mm3 Fully Integrated pH Sensor for Implantable Applications using Differential Sensing and Drift-Compensation,” IEEE Symposium on VLSI Circuits (SOVC), Jun. 2019.

18. I. Lee, and D. Blaauw, “A 31 pW-to-113 nW Hybrid BJT and CMOS Voltage Reference with 3.6% 3 sigma inaccuracy  from 0 oC to 170 oC for Low-Power High-Temperature Systems,” IEEE Symposium on VLSI Circuits (SOVC), Jun. 2019.

19. I. Lee, E. Moon, Y. Kim, J. Phillips, and D. Blaauw, “A 10mm3 Light-Dose Sensing IoT2 System with 35-to-339nW 10-to-300klx Light-Dose-to-Digital Converter,” IEEE Symposium on VLSI Circuits (SOVC), Jun. 2019.

20. Y. Peng, D. Choo, S. Oh, I. Lee, T. Jang, Y. Kim. J. Lim, D. Sylvester, and D. Blaauw, “An Adiabatic Sense and Set Rectifier for Improved Maximum Power Point Tracking in Piezoelectric Harvesting with 541% Energy Extraction Gain,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2019.

21. I. Lee, G. Kim, E. Moon, S. Jeong, D. Kim, J. Phillips, and D. Blaauw,” A 179lux Energy-Autonomous Fully-Encapsulated 17mm3 Sensor Node with Initial Charge Delay Circuit for Battery Protection,” IEEE Symposium on VLSI Circuits (SOVC), Jun. 2018.

22. X. Wu, I. Lee, Q. Dong, K. Yang, D. Kim, J. Wang, Y. Chen, Y. Zhang, M. Saligane, T. Ema, R. Nanjo, A. Harada, M. Yasuda, K. Kumeno, S. Miyoshi, M. Kawaminami, D. Sylvester, and D. Blaauw, “A 0.04mm3 16nW Wireless and Batteryless Sensor System with Integrated Cortex-M0+ Processor and Optical Communication for Intra-celluar Temperature Measurement,” IEEE Symposium on VLSI Circuits (SOVC), Jun. 2018.

23. I. Lee, D. Sylvester, and D. Blaauw, “Subthreshold Voltage Reference With Nwell/Psub Diode Leakage Compensation for Low-Power High-Temperature Systems,” IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2017.

24. Q. Dong, I. Lee, K. Yang, D. Blaauw, and D. Sylvester, “A 1.02nW PMOS-only, Trim-Free Current Reference with 282ppm/oC from -40oC to 120oC and 1.6% within-Wafer Inaccuracy,” IEEE European Solid-State Circuits Conference (ESSCIRC), Sep. 2017.

25. M. Cho, S. Oh, S. Jeong, Y. Zhang, I. Lee, Y. Kim, L.-X. Chuo, D. Kim, Q. Dong, Y.-P. Chen, M. Lim, M. Daneman, D. Blaauw, D. Sylvester, and H.-S. Kim, “A 6×5×4mm3 general purpose audio sensor node with a 4.7μW audio processing IC,” IEEE Symposium on VLSI Circuits (SOVC), June, 2017.

26. Q. Dong, Y. Kim, I. Lee, M. Choi, Z. Li, J. Wang, K. Yang, Y-P. Chen, J. Dong, M. Cho, G. Kim, W-K. Chang, Y-S. Chen, Y-D. Chih, D. Blaauw, and D. Sylvester, “A 1Mb Embedded NOR Flash Memory with 39μW Program Power for mm-Scale High-Temperature Sensor Nodes,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2017. 

27. X. Wu, Y. Shi, S. Jeloka, K. Yang, I. Lee, D. Sylvester, and D. Blaauw, “A 66pW discontinuous switch-capacitor energy harvester for self-sustaining sensor applications,” IEEE Symposium on VLSI Circuits (SOVC), June, 2016.

28. W. Lim, T. Jang, I. Lee, H.-S. Kim, D. Sylvester, and D. Blaauw, “A 380pW dual mode optical wake-up receiver with ambient noise cancellation,” IEEE Symposium on VLSI Circuits (SOVC), June 2016.

29. T. Jang, M. Choi, Y. Shi, I. Lee, D. Sylvester, and D. Blaauw, “Millimeter-scale computing platform for next generation of Internet of Things,” IEEE Int. Conf. RFID, May. 2016. 

30. I. Lee, W. Lim, A. Teran, J. Phillips, D. Sylvester, and D. Blaauw, “A >78%-Efficient Light harvester over 100-to-100klux with Reconfigurable PV-Cell Network and MPPT Circuit,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2016, pp. 370-371.

31. I. Lee, W. Jung, H. Ha, S. Jeong, Y. Kim, G. Kim, Z. Foo, J.-Y. Sim, D. Sylvester, and D. Blaauw, “An Ultra-Low-Power Biomedical Chip for Injectable Pressure Monitor,” IEEE Biomedical Circuits and Systems Conference (BIOCAS) (Invited), Oct. 2015. 

32. S. Bang, J.-S. Seo, I. Lee, S. Jeong, N. Pinckney, D. Blaauw, D. Sylvester, and L. Chang, “A Fully-Integrated 40-Phase Flying-Capacitance-Dithered Switched-Capacitor Voltage Regulator with 6mV Output Ripple,” IEEE Symposium on VLSI Circuits (SOVC), June 2015.

33. W. Lim, I. Lee, D. Sylvester, and D. Blaauw, “Batteryless Sub-nW Cortex-M0+ Processor with Dynamic Leakage-Suppression Logic,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2015.

34. M. Choi, I. Lee, T.-K. Jang, D. Blaauw, and D. Sylvester, “A 23pW 780ppm/°C Resistor-Less Current Reference Using Subthreshold MOSFETs,” IEEE European Solid-State Circuits Conference (ESSCIRC), Sep. 2014.

35. Y.-S. Kuo, P. Pannuto, G. Kim, Z. Foo, I. Lee, B. Kempke, P. Dutta, D. Blaauw,  and Y. Lee, “MBus: A 17.5 pJ/bit/chip Portable Interconnect Bus for Millimeter-Scale Sensor Systems with 8 nW Standby Power,” IEEE Custom Integrated Circuits Conference (CICC), Sep. 2014.

36. S. Jeong, I. Lee, D. Blaauw, and D. Sylvester, “A 5.8nW, 45ppm/°C On-Chip CMOS Wake-up Timer Using a Constant Charge Subtraction Scheme” IEEE Custom Integrated Circuits Conference (CICC), Sep. 2014.

37. I. Lee, Y. Kim, S. Bang, G. Kim, H. Ha, Y.-P. Chen, D. Jeon, S. Jeong, W. Jung, M. Ghaed, Z. Foo, Y. Lee, J.-Y. Sim, D. Sylvester, and D. Blaauw, “Circuit Techniques for Miniaturized Biomedical Sensors,” IEEE Custom Integrated Circuits Conference (CICC), Sep. 2014 (Invited).

38. I. Lee, Y. Lee, D. Sylvester, and D. Blaauw, “Low Power Battery Supervisory Circuit with Adaptive Battery Health Monitor,” IEEE Symposium on VLSI Circuits (SOVC), June, 2014, pp. C17-C18 (Selected as Symposium Technical Highlight).

39. D. Blaauw, D. Sylvester, P. Dutta, Y. Lee, I. Lee, S. Bang, Y. Kim, G. Kim, P. Pannuto, Y.-S Kuo, D. Yoon, W. Jung, Z. Foo, Y.-P. Chen, S. Oh, S. Jeong, M. Choi, “IoT Design Space Challenges: Circuits and Systems,” IEEE Symposium on VLSI Technology (SOVT), June, 2014 (Invited).

40. G. Kim, Y. Lee, Z. Foo, P. Pannuto, Y.-S. Kuo, B. Kempke, M. Ghaed, S. Bang, I. Lee, Y. Kim, S. Jeong, P. Dutta, D. Sylvester, and D. Blaauw, “A Millimeter-Scale Wireless Imaging System with Continuous Motion Detection and Energy Harvesting,” IEEE Symposium on VLSI Circuits (SOVC), June, 2014, pp. C141-C142.

41. G. Kim, A. Wolfe, R. Bell, S. Bang, Y. Lee, I. Lee, Y. Kim, L. Hsu, J. Kagan, M. Arias-Thode, B. Chadwick, D. Sylvester, and D. Blaauw, “Chip-On-Mud: Ultra-Low Power ARM-Based Oceanic Sensing System Powered by Small-Scale Benthic Microbial Fuel Cells,” IEEE International Symposium on Circuits and Systems (ISCAS), May 2014.

42. Y. Kim, W. Jung, I. Lee, Q. Dong, M. Henry, M, D. Sylvester, and D. Blaauw, “27.8 A static contention-free single-phase-clocked 24T flip-flop in 45nm for low-power applications,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2014, pp. 466-467.

43. I. Lee, S. Bang, D. Yoon, M. Choi, S. Jeong, D. Sylvester, and D. Blaauw, “A Ripple Voltage Sensing MPPT Circuit for Ultra-Low Power Microsystems,” IEEE Symposium on VLSI Circuits (SOVC), June, 2013, pp. C228-C229.

44. S. Bang, Y. Lee, I. Lee, Y. Kim, G. Kim, D. Blaauw, and D. Sylvester, "A fully integrated switched-capacitor based PMU with adaptive energy harvesting technique for ultra-low power sensing applications," IEEE International Symposium on Circuits and Systems (ISCAS), May 2013, pp.709-712.

45. D. Jeon, Y. Kim, I. Lee, Z. Zhang, D. Blaauw, and D. Sylvester, “A 470mV 2.7mW Feature Extraction-Accelerator for Micro-Autonomous Vehicle Navigation in 28nm CMOS,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2013, pp.166-167.

46. Z. Foo, D. Devescery, M. Ghaed, I. Lee, A. Madhavan, Y. Park, A. Rao, Z. Renner, N. Roberts, A. Schulman, V. Vinay, M. Wieckowski, D. Yoon, C. Schmidt, T. Schmid, P. Dutta, P. Chen,  and D. Blaauw, “A Low-Cost Audio Computer for Information Dissemination among Illiterate People Groups,” IEEE Custom Integrated Circuits Conference (CICC), Sep. 2012.

47. G. Kim, Y. Lee, S. Bang, I. Lee, Y. Kim, D. Sylvester,  and D. Blaauw, “A 695pW Standby Power Optical Wake-up Receiver for Wireless Sensor Nodes,” IEEE Custom Integrated Circuits Conference (CICC), Sep. 2012.

48. I. Lee, S. Bang, Y. Lee, Y. Kim, G. Kim, D. Sylvester, and D. Blaauw, “A 635pW Battery Voltage Supervisory Circuit for Miniature Sensor Nodes,” IEEE Symposium on VLSI Circuits (SOVC), June, 2012, pp. 202-203.

49. Y. Lee, G. Kim, S. Bang, Y. Kim, I. Lee, P. Dutta, D. Sylvester, and D. Blaauw, “A Modular 1mm3 Die-stacked Sensing Platform with optical Communication and Multi-Modal Energy Harvesting,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2012, pp.772-775.

50. Z. Foo, D. Devecsery, T. Schmid, N. Clark, R. Frank, M. Ghaed, Y. Kuo, I. Lee, Y. Park, Z. Renner, N. Slottow, V. Vinay, M. Wieckowski, D. Yoon, C. Schmidt, D. Blaauw, P. Chen, and P. Dutta, “A Case for Custom Silicon in Enabling Low-Cost Information Technology for Developing Regions,” ACM Symposium on Computing for Development, Dec. 2010.

51. J. Cheon, I. Lee, J. Lee, Y. Chae, Y. Yoo, and G. Han, “An Analog Front-End of a Fire Detection SOC for a Fire Alarm System,” IEEE Sensors Conf., Oct, 2008, pp. 772-775.

52. Y. Chae, I. Lee, and G. Han, “A 0.7V 36μW 85dB-DR Audio ΔΣ Modulator Using Class-C Inverter,” IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2008, pp. 490-491.

53.  I. Lee, Y. Chae, and G. Han, "A Low Power Dual-Mode Sigma-Delta Modulator for GSM/WCDMA Receivers," IEEE International Conference on Electronics, Circuits and Systems (ICECS), Dec. 2007, pp. 1151-1154.

Patents

1. D. Blaauw, D. Sylvester, M. Choi, I. Lee, and T. Jang, “Ultra low power temperature insensitive current source with line and load regulation,” U.S., grant (US 9,639,107 B2, May. 2, 2017)

2. I. Lee, Y. Lee, D. Sylvester, and D. Blaauw, “Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device,” U.S., grant (US 9,429,627 B2, Aug. 30, 2016).

3. G. Han, Y. Chae, I. Lee, D. Lee, S. Lim, J. Cheon, “Switched capacitor circuit,” Korea, Registered (101087246, Nov. 21. 2011).

4. G. Han, I. Lee, Y. Chae “Inverter and inverter based system,” Korea, Registered (101069377, Sep. 26. 2011).

5. I. Lee, Y. Chae, G. Han, Korea, “Hysteretic analog to digital converter,” Korea, Registered (10093385, Dec. 15. 2009).

6. Y. Chae, I. Lee, G. Han, “Cardiac pacemaker and method of co-using amplifier using the same,” Korea, Registered (100933281, Dec. 14. 2009).

7. Y. Chae, I. Lee, M. Kwon, G. Han, “Time-interleaved sigma-delta modulator using single amplifier architecture,” Korea, Registered (100933280, Dec. 14. 2009).

8. Y. Chae, I. Lee, J. Choen, G. Han, S.Ham, “Decimation filter, analog to digital converter including the same, and image sensors including the converters,” U.S., Filed (20090295956)/ Korea, Disclosed (1020090123206, Dec. 2. 2009).

9. Y. Chae, I. Lee, G.Han, S. Ham, “Sigma-delta analog to digital converters and solid state image pickup device,” U.S., Registered (7,773,018, Aug. 10, 2010)/ Korea, Disclosed (1020090121952, Nov. 26. 2009).

10. Y. Chae, I. Lee, J. Choen, G. Han, S. Ham, “Apparatus and method for sigma-delta analog to digital conversion,” U.S., Registered ( 7,916,061, Mar. 29. 2011)/ Korea, Disclosed (1020090111012, Oct. 26. 2009).

Invited Talks

1. Chosun University, Gwangju, South Korea, June 2023.

2. KAIST, Daejeon, South Korea, June 2023.

3. Hanbat National University, Daejeon, South Korea, June 2023.

4. Chungnam National University, Daejeon, South Korea, June 2023.

5. Kyungpook National University, Daegu, South Korea, June 2023.

6. SungKyunKwan University (SKKU), Suwon, South Korea, June 2023.

7. Busan National University, Busan, South Korea, June 2023.

8. UNIST, Ulsan, South Korea, June 2023.

9. POSTECH, Pohang, South Korea, June 2023.

10. Ewha Womans University, Seoul, South Korea, May 2023.

11. Seoul National University, Seoul, South Korea, May 2023.

12. UC Davis, Davis, CA, May 2023.

13. IEEE Custom Integrated Circuits Conference (CICC) Forum, San Antonio, TX, Apr. 2023.

14. Yonsei University, Seoul, South Korea, Apr. 2023.

15. The 17th ROK-USA Forum on Nanotechnology, Seoul, South Korea, Apr. 2023.

16. MDPI 5th Electronics Webinar, Online, July 2022.

17. University of Delaware, Newark, DE, Oct, 2021.

18. University of Pittsburgh, Pittsburgh, PA, Feb. 2021.

19. Yonsei University, Seoul, South Korea, Dec. 2020.

20. University of Pittsburgh, Pittsburgh, PA, Sep. 2019.

21. North Carolina State University, Raleigh, NC, Mar. 2019.

22. Indiana University, Bloomington, IL, Mar. 2019.

23. University of Pittsburgh, Pittsburgh, PA, Jan. 2019.

24. IBM, Yorktown Heights, NY, Nov. 2018.

25. Samsung, Suwon, Korea, May 2018.

26. Pennsylvania State University, University Park, PA, Mar. 2018.

27. Indiana University, Bloomington, IL, Mar. 2018.

28. SungKyunKwan University (SKKU), Suwon, Korea, May 2016.

29. International Symposium on Quality Electronic Design (isQED), Santa Clara, CA, Mar. 2016.