Research

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.. 

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).

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

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.

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).

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).

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.

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.

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. 

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.

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).

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.

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.

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.

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.

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.

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).

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. 

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).

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.

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.

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). 

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. 

D. 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.

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.

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) 

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.

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.

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) 

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. 

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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).

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.

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.

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. 

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.

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).

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).

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.

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.

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).

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).

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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. 

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. 

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.

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.

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.

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).

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.

 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.