Conference Papers
Conference Papers (International)
<2025>
[54] Y. Lee, H. Park, M. Kim, W. Jung, H. Kim, and H.-M. Lee, "A 97.4%-Peak-Efficiency Always-Half-Inductor-Current Hybrid Bidirectional Converter with Adaptive Target Current Tracking for USB-to-2-Cell Bidirectional Power Transfer," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2025.
[53] J. Ahn, S. H. Choi, J. An, and H.-M. Lee, "A Real-Time Pixel-Compensated Source Driver IC with Dual Slope Error Detection and Multi-Channel Time-Multiplexing Compensator for Compact OLED Displays," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2025.
[52] J. An, S. H. Choi, J. Ahn, S. Baek, Y. Kim, S.-W. Kim, J.-Y. Lee, Y.-K. Choi, and H.-M. Lee, "A Compact 10b Source Driver IC with Sigma-Delta Pulse Width Modulation for Low-Voltage Digital Interpolation Achieving 1884µm²/Channel," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2025.
<2024>
[51] H. Roh, J. Kang, H.-M. Lee, and M. Im, "Efficiency of Combined Optogenetic and Electric Stimulation Depending on Amplitude and Waveform of Electric Stimulation in Mouse Retina," International Symposium on Visual Prosthetics (Artificial Vision), Dec. 2024.
[50] M. J. Kim, J. Im, K. Kim, Y. Jo, G. Noh, I. Kim, Y. Jeong, H.-M. Lee, and J. Y. Kwak, "Adaptive SNN Neuromorphic Hardware for Interfacing between Emerging Neuron and Synaptic Devices," IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2024.
[49] K.-H. Lee, S.-S. Kim, J. Kim, K. Hyun, J.-H. Roh, Y.-C. Lee, K.-S. Shin, C. Cha, and H.-M. Lee, "A Novel Invasive Biosensor Sensor Module Integrating Multi-Sensors and Readout IC for Enhanced Convenience in Daily Life Biomonitoring," International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS), Oct. 2024.
[48] H. Roh, J. Kang, H.-M. Lee, and M. Im, "Enhanced Optogenetic Stimulation of Retinal Ganglion Cells with Assistive Electric Stimulation for Low Optical Power Artificial Vision," FASEB Science Research Conferences: Retinal Neurobiology and Visual Processing, Jun. 2024.
[47] S.-B. Ku, J. Kim, K.-H. Lee, H.-S. Lee, K. Eom, J. Kang, H. Jung, C. Cha, and H.-M. Lee, "A Fully Integrated Microplastic Detection SoC with 0.1–3 GHz Bandwidth and 35 dB Dynamic Range for Narrow-Band Notch RF MEMS Sensor System," IEEE Radio Frequency Integrated Circuits Symposium (RFIC), Jun. 2024.
[46] M. Kang, M. Um, J. Won, J. Kang, S. Hong, N. Han, S. Kim, S. Kim, and H.-M. Lee, "An Analog Neuromorphic On-Chip Training System with IGZO TFT-Based 6T1C 367-State Synaptic Memory Achieving 0.99-R2 Linearity and 104-Times Enhanced Retention Time," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2024.
[45] H.-S. Lee, K. Eom, and H.-M. Lee, "A 90.8%-Efficiency SIMO Resonant Regulating Rectifier Generating 3 Outputs in a Half Cycle with Distributed Multi-Phase Control for Wirelessly-Powered Implantable Devices," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2024.
[44] M. Kim, W. Jung, H. Park, J. Song, Y. Ahn, T. Nam, Y. Shin, Y.-J. Woo, and H.-M. Lee, "A 96.5% Peak Efficiency Duty-Independent DC-DC Step-Up Converter with Low Input-Level Voltage Stress and Mode-Adaptive Inductor Current Reduction," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2024.
[43] J. Ahn, S. H. Choi, J. An, K.-D. Kim, and H.-M. Lee, "A Fully Nonlinear Compact 10b Source Driver with Low-Voltage Gamma Slope DAC and Data/Phase Dependent Current Modulation Achieving 2411µm²/Channel for Mobile OLED Displays," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2024.
[42] J. An, S. H. Choi, J.-Y. Lee, S.-W. Kim, H.-M. Lee, and Y.-K. Choi, "Noise Immunity in Capacitive Sensing: Single-Ended AFE Design with Common-Current Subtraction for Mutual- and Self-Capacitance Sensing in 390pF Load," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2024.
<2023>
[41] S. H. Choi, J. Kim, J. Ahn, J. An, J. Kim, O. Kwon, K.-D. Kim, and H.-M. Lee, "An Area and Power Efficient Fully Nonlinear 10-bit Column Driver with Time-Shared Multi-Gamma-Slope DAC and Time-Interleaved Sampling Buffer for Mobile AMOLEDs," IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2023.
[40] H.-S. Lee and H.-M. Lee, "A 92.7%-Efficiency 6.78-MHz Dual-Output Energy-Resuscitating Resonant Regulating Rectifier for Wirelessly Powered Systems," IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2023.
[39] M. Um, M. Kang, H. Kwak, K. Noh, S. Kim, and H.-M. Lee, "An ECRAM-Based Analog Compute-in-Memory Neuromorphic System with High-Precision Current Readout for Deep Learning," IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2023.
[38] M. Cho, M. Kang, M. Um, H. Park, and H.-M. Lee, "CMOS Leaky Integrate-and-Fire Neurons with Local Dynamic Biasing and Inhibitory Self-Oscillation," IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2023.
[37] S.-B. Ku, K. Lee, H.-S. Lee, K. Eom, M. Park, J. Kim, C. Cha, and H.-M. Lee, "An RF MEMS Sensor Driver/Readout SoC with Resonant Frequency Shift and Closed-Loop Envelope Regulation for Microplastic Detection," IEEE European Solid-State Circuits Conference (ESSCIRC), Sep. 2023.
[36] J. Ahn, H.-S. Lee, K. Eom, W. Jung, and H.-M. Lee, "A 93.5%-Efficiency 13.56-MHz-Bandwidth Optimal On/Off Tracking Active Rectifier with Fully Digital Feedback-Based Delay Control for Adaptive Efficiency Compensation," IEEE Symposium on VLSI Technology and Circuits (VLSI), Jun. 2023.
[35] M. Park, K. Eom, H.-S. Lee, S.-B. Ku, and H.-M. Lee, "A 9V-Tolerant 71.4%-Efficiency Stacked-Switched-Capacitor Stimulation System with Level-Adaptive Switching Control and Rapid Stimulus-Synchronized Charge Balancing," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2023.
[34] K. Eom, M. Park, H.-S. Lee, S.-B. Ku, N. Kim, S. Cha, Y. S. Goo, S. Kim, S.-W. Kim, and H.-M. Lee, "A Stimulus-Scattering-Free Pixel-Sharing Sub-Retinal Prosthesis SoC with 35.8dB Dynamic Range Time-Based Photodiode Sensing and Per-Pixel Dynamic Voltage Scaling," IEEE International Solid-State Circuits Conference (ISSCC), Feb. 2023.
<2022>
[33] H. Park, W. Jung, M. Kim, and H.-M. Lee, "A Fast-Transient and Wide-Range Output Capacitor-Less NMOS LDO Regulator with Adaptive-Gain Nested Miller Compensation and Pre-Emphasis Inverse Biasing," IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2022.
[32] S.-H. Choi, J.-Y. An, J.-Y. Lee, S.-W. Kim, H.-M. Lee, and Y.-K. Choi, "A Circuit Modeling Method of OLED On-Cell Touch Panels Including the Touch Objects for Full-Frame Touch Simulation," SID Eurodisplay Conference, Sep. 2022.
[31] S.-H. Choi, J.-Y. An, J.-Y. Lee, S.-W. Kim, H.-M. Lee, and Y.-K. Choi, "Implementation of Full-Panel Circuit Models for Interference Estimation Between Touch and Display Operation in On-Cell Touch AMOLED," Soceity for Information Display (SID) Symposium, May 2022.
[30] W. Jung, M. Kim, H. Park, S. Yoo, T.-H. Kong, J.-H. Yang, M. Choi, J. Shin, and H.-M. Lee, "A Hybrid Always-Dual-Path Recursive Step-Down Converter Using Adaptive Switching Level Control Achieving 95.4% Efficiency with 288mΩ Large-DCR Inductor," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2022.
[29] K. Eom, H.-S. Lee, M. Park, S. M. Yang, J. C. Choe, S.-W. Hwang, Y.-W. Suh, and H.-M. Lee, "A 92%-Efficiency Inductor-Charging Switched-Capacitor Stimulation System with Level-Adaptive Duty Modulation and Offset Charge Balancing for Muscular Stimulation," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2022.
<2021>
[28] K. Lee, J. Kim, H.-M. Lee, and C. Cha, "Carbon Black based Resistive Strain Gauge Sensor for Penile Measurement," IEEE International Conference on Industrial Engineering and Engineering Management (IEEM), Dec. 2021.
[27] H.-S. Lee, M. Kim, J. Ahn, and H.-M. Lee, "A Load-Insensitive Hybrid Back Telemetry System for Wirelessly-Powered Implantable Devices," IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2021.
[26] C.-H. Kim and H.-M. Lee, "A 2.45-GHz RF Energy Harvester with On-Chip 8-VCR SC Booster for IoT Devices," IEEE International Symposium on Circuits and Systems (ISCAS), May 2021.
[25] M. Kim, H. Lee, and H.-M. Lee, "An Efficient Wireless Power and Data Transfer System with Current-Modulated Energy-Reuse Back Telemetry and Energy-Adaptive Dual-Input Voltage Regulation," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2021.
<2020>
[24] H. Lee, H. Park, and H.-M. Lee, "A Multi-Channel Neural Recording System with Adaptive Electrode Selection for High-Density Neural Interface," IEEE Engineering in Medicine and Biology Conference (EMBC), Jul. 2020.
[23] H.-M. Lee, "Energy-Efficient Wireless Neural Stimulation Systems for Implantable Devices," IEEE Engineering in Medicine and Biology Conference (EMBC), Jul. 2020.
<2019>
[22] H.-M. Lee, "Implantable Biomedical Devices with IC Solutions," Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices (AWAD), Jul. 2019 (invited).
<2018>
[21] K.-D. Kim, S. Park, K.-S. Yoon, G.-G. Kang, H.-K. Han, J.-S. Choi, M.-W. Ko, J.-H. Cho, S. Lim, H.-M. Lee, H.-S. Kim, K. Lee, and G.-H. Cho, "A 100mK-NETD 100ms-Startup-Time 80×60 Micro-Bolometer CMOS Thermal Imager Integrated with a 0.234mm2 1.89μVrms Noise 12b Biasing DAC," IEEE International Solid-State Circuits Conference (ISSCC), pp. 192-193, Feb. 2018.
[20] S.-U. Shin, Y. Huh, Y. Ju, S. Choi, C. Shin, Y.-J. Woo, M. Choi, S.-H. Park, Y.-H. Sohn, M.-W. Ko, Y. Jo, H. Han, H.-M. Lee, S.-W. Hong, W. Qu, and G.-H. Cho, "A 95.2% Efficiency Dual-Path DC-DC Step-Up Converter with Continuous Output Current Delivery and Low Voltage Ripple," IEEE International Solid-State Circuits Conference (ISSCC), pp. 430-431, Feb. 2018.
[19] M.-W. Ko, K.-D. Kim, Y.-J. Woo, S.-U. Shin, H.-K. Han, Y. Huh, G.-G. Kang, J.-H. Cho, S. Lim, S.-H. Park, H.-M. Lee, and G.-H. Cho, "A 97% High-Efficiency 6μs Fast-Recovery-Time Buck-Based Step-Up/Down Converter with Embedded 1/2 and 3/2 Charge-Pumps for Li-ion Battery Management," IEEE International Solid-State Circuits Conference (ISSCC), pp. 428-429, Feb. 2018.
[18] C. S. Juvekar, J. Kwong, H.-M. Lee, and A. P. Chandrakasan, "A Nonvolatile Flip-Flop-Enabled Cryptographic Wireless Authentication Tag with Per-Query Key Update and Power-Glitch Attack Countermeasures," Asia and South Pacific Design Automation Conference (ASP-DAC), pp. 279-280, Jan. 2018.
<2017>
[17] S. Kim, T. Gokmen, H.-M. Lee, and W. E. Haensch, "Analog CMOS-Based Resistive Processing Unit for Deep Neural Network Training," IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), Aug. 2017.
<~2016>
[16] C. S. Juvekar, H.-M. Lee, J. Kwong, and A. P. Chandrakasan, "A Keccak-Based Wireless Authentication Tag with Per-Query Key Update and Power-Glitch Attack Countermeasures," IEEE International Solid-State Circuits Conference (ISSCC), pp. 290-291, Feb. 2016.
[15] H.-M. Lee, M. Kiani, and M. Ghovanloo, "Advanced Wireless Power and Data Transfer Techniques for Implantable Medical Devices," IEEE Custom Integrated Circuits Conference (CICC), Sep. 2015.
[14] H.-M. Lee, K.-Y. Kwon, W. Li, and M. Ghovanloo, "A Wireless Implantable Switched-Capacitor Based Optogenetic Stimulating System," IEEE Engineering in Medicine and Biology Conference (EMBC), pp. 878-881, Aug. 2014.
[13] H.-M. Lee, K.-Y. Kwon, W. Li, and M. Ghovanloo, "A Power-Efficient Switched-Capacitor Stimulating System for Electrical/Optical Deep-Brain Stimulation," IEEE International Solid-State Circuits Conference (ISSCC), pp. 414-415, Feb. 2014.
[12] K.-Y. Kwon, H.-M. Lee, M. Ghovanloo, A. Weber, and W. Li, "A Wireless Slanted Optrode Array with Integrated Micro LEDs for Optogenetics," IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Jan. 2014.
[11] H.-M. Lee and M. Ghovanloo, "An Adaptive Reconfigurable Active Voltage Doubler/Rectifier for Extended-Range Inductive Power Transmission," IEEE International Solid-State Circuits Conference (ISSCC), pp. 286-287, Feb. 2012.
[10] H. Park, B. Gosselin, M. Kiani, H.-M. Lee, J. Kim, X. Huo, and M. Ghovanloo, "A Wireless Magnetoresistive Sensing System for an Intra-Oral Tongue-Computer Interface," IEEE International Solid-State Circuits Conference (ISSCC), pp. 124-125, Feb. 2012.
[09] H.-M. Lee and M. Ghovanloo, "Fully Integrated Power-Efficient AC-to-DC Converter Design in Inductively-Powered Biomedical Applications," IEEE Custom Integrated Circuits Conference (CICC), Sep. 2011.
[08] S. B. Lee, H.-M. Lee, M. Kiani, U.-M. Jow, and M. Ghovanloo, "An Inductively Powered Scalable 32-ch Wireless Neural Recording System-on-a-Chip with Power Scheduling for Neuroscience Applications," IEEE International Solid-State Circuits Conference (ISSCC), pp. 120-121, Feb. 2010.
[07] H.-M. Lee, Y.-J. Jeon, S.-W. Lee, G.-H. Cho, H.-R. Kim, Y.-K. Choi, and M. Lee, "A 10b Column Driver with Variable-Current-Control Interpolation for Mobile Active-Matrix LCDs," IEEE International Solid-State Circuits Conference (ISSCC), pp. 266-267, Feb. 2009.
[06] Y.-J. Jeon, H.-M. Lee, S.-W. Lee, G.-H. Cho, H.-R. Kim, Y.-K. Choi, and M. Lee, "A Piecewise Linear 10 bit DAC Architecture with Drain Current Modulation for Compact AMLCD Driver ICs," IEEE International Solid-State Circuits Conference (ISSCC), pp. 264-265, Feb. 2009.
[05] J.-Y. Jeon, Y.-J. Jeon, Y.-S. Son, K.-C. Lee, H.-M. Lee, S.-C. Jung, K.-H. Lee, and G.-H. Cho, "Direct-Type Fast Feedback Current Driver for Medium to Large Size AMOLED Displays," IEEE International Solid-State Circuits Conference (ISSCC), pp.174-175, Feb. 2008.
[04] H.-M. Lee, Y.-S. Son, Y.-J. Jeon, J.-Y. Jeon, S.-C. Jung, and G.-H. Cho, "Area and Power Efficient 10-Bit Column Driver with Interpolating DAC and Push-Pull Amplifier for AMLCDs," Society for Information Display Symposium (SID), pp.889-891, May 2008.
[03] J.-Y. Jeon, Y.-S. Son, Y.-J. Jeon, G.-H. Lee, H.-M. Lee, S.-C. Jung, and G.-H. Cho, "A Multi-Chip Reference Current Generating Circuit for Current-Mode Column Driver ICs," Society for Information Display Symposium (SID), pp.350-352, May 2007.
[02] Y.-J. Jeon, Y.-S. Son, J.-Y. Jeon, G.-H. Lee, H.-M. Lee, S.-C. Jung, and G.-H. Cho, "A Cascaded-Dividing Current DAC with Fine Pitch for High-Resolution AMOLED Display Drivers," Society for Information Display Symposium (SID), pp.1644-1646, May 2007.
[01] H.-M. Lee, Y.-S. Son, Y.-J. Jeon, J.-Y. Jeon, G.-H. Lee, S.-C. Jung, and G.-H. Cho, "A 10 Bit Gray Scale Digital-to-Analog Converter with an Interpolating Buffer Amplifier for AMLCD Column Drivers," Society for Information Display Symposium (SID), pp.346-349, May 2007.