Papers

• Geunha Kim, Sehwan Lee, Taeryoung Seol, Kyuhyeon Park, Jeongyoon Wie, Minoo Lee, Seokhan Jeong, Yeonjae Shin, Sangkyu Lee, Byeongwoo Koo, Michael Choi, Junghyup Lee, "A 1V Time-Division-Multiplexed 4-Channel 3rd-Order NS-SAR ADC with 178.8dB FoMDR and 5.8GΩ Input Impedance for Wearable Dry-Contact Biopotentials,"  IEEE Symp. VLSI Circuits (VLSIC) (One of the world’s 3 top semiconductor conferences)​ - Accepted

• Geunha Kim, Kyuhyeon Park, Minoo Lee, Jeongyoon Wie, Seokhan Jeong, Yeonjae Shin, Kyoungtae Lee, Jong-Hyeok Yoon, Minyoung Song, Junghyup Lee, "A 185.6dB-FOMDR 180.3dB-FOMSNDR 10.64-NEF NS-SAR-ADC with Calibration-Free 2nd-Order kT/C-Noise Shaping for Wearable ExG Acquisition," IEEE Int. Solid-State Circuits Conference (ISSCC), 2026. (The world's top semiconductor conference)

• Jihun Son, Minsu Park, Chansoo Park, Kyoungtae Lee, Jong-Hyeok Yoon, Junghyup Lee, Minyoung Song, “A 0.0523mm2 11.4mW IEEE 802.15.4a/z/ab Compatible Aliasing-Suppressing All-Digital IR-UWB Transmitter Featuring Comb-Notched Maximally Flat Amplitude Spectral Shaping,” IEEE Int. Solid-State Circuits Conference (ISSCC), 2026. (The world's top semiconductor conference) 

• Taeryoung Seol, Sehwan Lee, Geunha Kim, Samhwan Kim, Yeonjae Shin, Jeongyoon Wie, Seungyeob Baik, Hongki Kang, Minyoung Song, Jong-Hyeok Yoon, Junghyup Lee, “A 136.6 dB-DR 174.3 dB-FoMS Versatile Current-to-Digital Converter with a Truncated-Noise-Shaped Baseline-Servo-Loop,” IEEE J. Solid-State Circuits (JSSC), 2025. (The world’s top IC design journal)

• Duhee Kim, Murali Bissannagari, Boil Kim, Nari Hong, Jaeu Park, Hyeongtae Lim, Junhee Lee, Jungha Lee, Yoon Kyoung Kim, Youngjae Cho, Kwang Lee, Junghyup Lee, Jong-Hyeok Yoon, Jae Eun Jang, David Tsai, Sanghoon Lee, Hyuk-Jun Kwon, Han Kyoung Choe, Hongki Kang, “Hexagonal metal complex based mechanically robust transparent ultrathin gold µECoG for electro-optical neural interfaces,” npj Flexible Electronics, 2025.​

• Jee Woong Lee, Junhee Lee, Jungha Lee, Duhee Kim, Woongki Hong, Junghyup Lee, Minyoung Song, Hongki Kang, “Transparent Temperature Sensors for Photothermal Neuromodulation: Advances, Challenges, and Future Directions,” Advanced Materials Interfaces, 2025.​​

• Chanyoung Kim, Junghyup Lee, Minyoung Song, “Wireless System Miniaturization Solutions for Ingestible Sensors,” Journal of Semiconductor Technology and Science, 2024. 

• Dong-Gu Choi, Jaehyun Lee, Jahyun Koo, Woo Kyoung Han, Dahoon Park, Jaeha Kung, Junghyup Lee, Jong-Hyeok Yoon, “A 65nm 687.5-TOPS/W Drive Strength-based SRAM Compute-In-Memory Macro with Adaptive Dynamic Range for Edge AI applications,” IEEE Asian Solid-State Circuits Conference (A-SSCC), 2024.​​ 

• Pangi Park, Junghyup Lee, SeongHwan Cho, "A PVT-Insensitive Sub-Ranging Current Reference Achieving 11.4ppm/°C from -20°C to 125°C," IEEE Journal of Solid-State Circuits (JSSC), 2024. (The world's top IC Journal)​ 

• Sehwan Lee, Taeryoung Seol, Geunha Kim, Minyoung Song, Gain Kim, Jong-Hyeok Yoon, Arup K. George, Junghyup Lee, “A 97dB-PSRR 178.4dB-FOMDR Calibration-Free VCO-ΔΣ ADC Using a PVT-Insensitive Frequency-Locked Differential Regulation Scheme for Multi-Channel ExG Acquisition” Proc. IEEE Symp. VLSI Circuits (VLSIC), June. 2024 (One of the world’s 3 top semiconductor conferences)​ 

• Jiwon Chae, Dongsu Kim, Goeun Pyo, Su Jin Heo, Joonghyun Kim, Kwonsik Shin, Byoung Ok Jun, Hongki Kang, Hyuk-Jun Kwon, Ji-Woong Choi, Junghyup Lee, Jae Eun Jang, “Flexible multi-electrode neural probe using active-matrix design of transistor array,” Sensors and Actuators A: Physical, 2024.

• Su Jin Heo, Jeong Hee Shin, Junghyup Lee, Jae Eun Jang, “Tunneling Transistor with a Stacked Floating Electrode for Current Saturation,” IEEE Electron Device Letters, 2024.

• Jeongyoon Wie, Sangwoo Jung, Taeryoung Seol, Geunha Kim, Sehwan Lee, Homin Jang, Samhwan Kim, Yeonjae Shin, Jae Eun Jang, Jaeha Kung, Arup K. George, Junghyup Lee, "A 3.3-to-11V-Supply-Range 10μW/Ch Arbitrary-Waveform-Capable Neural Stimulator with Output-Adaptive-Self-Bias and Supply-Tracking Schemes in 0.18μm Standard CMOS," IEEE Custom Integrated Circuits Conference (CICC), 2024. 

• Taeryoung Seol, Sehwan Lee, Geunha Kim, Samhwan Kim, Arup K. George, Junghyup Lee, "A Hybrid Recording System with 10kHz-BW 630mVPP 84.6dB-SNDR 173.3dB-FOMSNDR and 5kHz-BW 114dB-DR for Simultaneous ExG and Biocurrent Acquisition," IEEE Int. Solid-State Circuits Conference (ISSCC), 2024. (The world's top semiconductor conference)

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• Pangi Park, Junghyup Lee, SeongHwan Cho, "A PVT-Insensitive Sub-Ranging Current Reference Achieving 11.4ppm/°C from -20°C to 125°C," IEEE Int. Solid-State Circuits Conference (ISSCC), 2024. (The world's top semiconductor conference)

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• Sangwoo Hwang, Yujin Hwang, Duhee Kim, Junhee Lee, Han Kyoung Choe, Junghyup Lee, Hongki Kang, Jaeha Kung, “ReplaceNet: real-time replacement of a biological neural circuit with a hardware-assisted spiking neural network,” Frontiers in Neuroscience, 2023.​ 

• Hoyong Seong, Donghyun Youn, Injun Choi, Junghyup Lee, Sohmyung Ha, Minkyu Je, “A 0.9 V 2MHz 6.4 x-Slope-Boosted Quadrature-Phase Relaxation Oscillator with 164.2 dBc/Hz FoM and 62.5 ppm Period Jitter in 0.18 μm CMOS,” in Proc. IEEE Custom Integrated Circuits Conference (CICC), 2023. 

• Geunha Kim, Sehwan Lee, Taeryoung Seol, Seungyeob Baik, Yeonjae Shin, Gain Kim, Jong-Hyeok Yoon, Arup K. George, Junghyup Lee, "1V-Supply 1.85VPP-Input-Range 1kHz-BW 181.9dB-FOMDR 179.4dB-FOMSNDR 2nd-Order Noise-Shaping SAR-ADC with Enhanced Input Impedance in 0.18μm CMOS," IEEE Int. Solid-State Circuits Conference (ISSCC), 2023. (The world's top semiconductor conference)​ 

• Taeryoung Seol, Sehwan Lee, Geunha Kim, Samhwan Kim, Euiseong Kim, Seungyeob Baik, Jaeha Kung, Ji-Woong Choi, Arup K. George, Junghyup Lee, "A 1V 136.6dB-DR 4kHz-BW ΔΣ Current-to-Digital Converter with a Truncation-Noise-Shaped Baseline-Servo-Loop in 0.18μm CMOS," IEEE Int. Solid-State Circuits Conference (ISSCC), 2023. (The world's top semiconductor conference)​ 

• Hoyong Seong, Chongsoo Jung, Donghyun Youn, Junghyup Lee, Sohmyung Ha, Minkyu Je, “A 118.6fJ/Conversion-Step Two-Step Time-Domain RC-to-Digital Converter With 33nF/10MΩ Range and 53aFrms Resolution,” in Proc. IEEE Asian Solid-State Circuits Conference (A-SSCC), 2022. 

• Seungyeob Baik, Taeryoung Seol, Sehwan Lee, Geunha Kim, SeongHwan Cho, Arup K. George, Junghyup Lee, “A 2.54μJ∙ppm2-FOMS Supply- and Temperature-Independent Time-Locked ΔΣ Capacitance-to-Digital Converter in 0.18-μm CMOS,” Proc. IEEE Symp. VLSI Circuits (VLSIC), June. 2022 (One of the world’s 3 top semiconductor conferences)

• Sehwan Lee, Yoonsung Choi, Geunha Kim, Seungyeob Baik, Taeryoung Seol, Homin Jang, Doyoung Lee, Minkyu Je, Ji-Woong Choi, Arup K. George, Junghyup Lee, “A 0.7V 17fJ/step-FOMW 178.1dB-FOMSNDR 10kHz-BW 560mVPP True-ExG Biopotential Acquisition System with Parasitic-Insensitive 421MΩ Input Impedance in 0.18μm CMOS,” in Proc. IEEE Int. Solid-State Circuits Conference (ISSCC), Feb. 2022. (The world’s top semiconductor conference) 

• Arup K. George, Wooyoon Shim, Ji-Hoon Kim, Minkyu Je, and Junghyup Lee, “An Ultra-Wide Input-Range Reconfigurable RC-to-Digital Converter with Parasitic- and Temperature-Insensitivity for Industrial IoT Applications,” IEEE Trans. Circuits and Systems-I:Regular Papers (TCAS-I), 2021.

• Thithuy Pham, Dongmin Kim, Seohyeong Jeong, Junghyup Lee* and Donggu Im*, “A High Efficiency Low Noise RF-to-DC Converter Employing Gm-Boosting Envelope Detector and Offset Canceled Latch Comparator,” Electronics, vol. 10, no.9, 2021.  

• Sangwoo Hwang, Junghyup Lee, Jaeha Kung, “Adaptive input-to-neuron interlink development in training of spike-based liquid state machines,” IEEE International Symposium on Circuits and Systems (ISCAS), May, 2021.  

• Dongmin Kim, Seunghyeok Jang, Junghyup Lee, Donggu Im, “A Broadband PVT Insensitive ALL-NMOS Noise Canceling Balun-LNA for Sub-GHz Wireless Communication Applications,” IEEE Microwave and Wireless Components Letters, vol. 31, pp. 165-168, 2021.​

• Samhwan Kim, Seongtak Kang, Jinmo Kim, Doyoung Lee, Sanghee Kim, Junghyup Lee, Kyung-In Jang, Yong-Seok Oh, Jong-Cheol Rah, Man Seung Huh, Sun Ha Paek, Ji-Woong Choi, “Closed-Loop Neuromodulation for Parkinson’s Disease: Current State and Future Directions,”　IEEE Trans. Molecular, Biological, and Multi-Scale Communications, 2020.

• Soonyoung Hong, Arup K. George, Donggu Im, Minkyu Je, Junghyup Lee, "A 1.0 V, 5.4 pJ/bit GFSK Demodulator Based on an Injection Locked Ring Oscillator for Low-IF Receivers," IEEE Access, vol. 8, pp. 185209 – 185217, 2020. 

• Junghyup Lee, Arup K. George, Minkyu Je, “An Ultra-Low-Noise Swing-Boosted Differential Relaxation Oscillator in 0.18-μm CMOS,” IEEE J. Solid-State Circuits (JSSC), vol. 55, no. 9, pp. 2489-2497, 2020. (The world’s top IC design journal) 

• Soonyoung Hong, Sehwan Lee, Junghyup Lee, and Minkyu Je, “A Multi-Mode ULP Receiver Based on an Injection-Locked Oscillator for IoT Applications,” IEEE Access, vol. 8, pp. 76966-76979, 2020.  

• Taeju Lee, Soonyoung Hong, Chongsoo Jung, Junghyup Lee, and Minkyu Je, “A 1-V 4.6-mW/channel Fully Differential Neural Recording Front-end IC with Current-controlled Pseudoresistor in 0.18-μm CMOS,” Journal of Semiconductor Technology and Science, vol. 19, no. 1, pp. 30-41, Feb. 2019.

• Taeryoung Seol, Sehwan Lee and Junghyup Lee, “A Wearable Electrocardiogram Monitoring System Robust to Motion Artifacts,” Proc. IEEE Int. SoC Design Conference, 2018.  

• Seungyeob Baik, Arup K. George, and Junghyup Lee, “An Ultra-low-power Fully-differential ASK Demodulator with 12.5 pJ/bit FOM for Implantable Biomedical Applications,” Journal of Semiconductor Technology and Science, vol. 18, no. 5, pp. 626-632, Oct. 2018.

• Doojin Jang, Taeju Lee, Hyuntak Jeon, Seoktae Koh, Jaesuk Choi, Junghyup Lee, Minkyu Je, “16-Channel High-CMRR Neural-Recording Amplifiers Using Common-Mode-Tracking Power Supply Rails” Proc. IEEE Radio-Frequency Integration Technology (RFIT), Aug. 2018. 

• Arup K. George, Wooyoon Shim, Minkyu Je and Junghyup Lee, “A 114-aFrms-Resolution 46-nF/10-MΩ-Range Digital-Intensive Reconfigurable RC-to-Digital Converter with Parasitic-Insensitive Femto-Farad Baseline Sensing,” Proc. IEEE Symp. VLSI Circuits (VLSIC), Jun. 2018. (One of the world’s 3 top semiconductor conferences)

• Sehwan Lee, Arup K. George, Taeju Lee, Jun-Uk Chu, Sungmin Han, Ji-Hoon Kim, Minkyu Je and Junghyup Lee, “A 110dB-CMRR 100dB-PSRR Multi-Channel Neural-Recording Amplifier System Using Differentially Regulated Rejection Ratio Enhancement in 0.18μm CMOS", in Proc. IEEE Int. Solid-State Circuits Conference (ISSCC), Feb. 2018. (The world’s top semiconductor conference) 

• Junghyup Lee, Arup K. George, and Minkyu Je, “An Ultra-Low-Noise Differential Relaxation Oscillator based on a Swing-Boosting Scheme,” in Proc. Asia and South Pacific Design Automation Conference (ASP-DAC), Jan. 2018. (Best Design Award)

• Taeju Lee, Doojin Jang, Yoontae Jung, Hyuntak Jeon, Soonyoung Hong, Sungmin Han, Jun-Uk Chu, Junghyup Lee, and Minkyu Je, “A Neural Recording Amplifier Based on Adaptive SNR Optimization Technique for Long-Term Implantation,” in Proc. IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2017. 

• Seungyeob Baik, Arup K. George, Minkyu Je and Junghyup Lee, “A 1 V 2.5 μW Fully-Differential ASK Demodulator with 12.5 pJ/bit FOM for Ultra-Low Power Biomedical Applications,” in Proc. IEEE Int. Midwest Symposium on Circuits and Systems (MWSCAS), Aug. 2017.

• Camilo Libedinsky, Rosa So, Zhiming Xu, Toe K. Kyar, Duncun Ho, Clement Lim, Louiza Chan, Yuanwei Chua, Lei Yao, Jia Hao Cheong, Junghyup Lee, Kulkarni Vinayak Vishal, Yongxin Guo, Zhi Ning Chen, Lay K. Lim, Peng Li, Lei Liu, Xiaodan Zou, Kai K. Ang, Yuan Gao, Wai Hoe Ng, Boon Siew Han, Keefe Chng, Cuntai Guan, Minkyu Je, Shih-Cheng Yen, “Independent Mobility Achieved Through a Wireless Brain-Machine Interface,” PLoS One, Nov. 2016.​

• Arup K. George, Junghyup Lee, Zhi Hui Kong, and Minkyu Je, “A 0.8-V Supply- and Temperature- Insensitive Capacitance-to-Digital Converter in 0.18-μm CMOS,” IEEE Sensors Journal, vol. 16, no. 13, pp. 5354–5364, July 2016. (One of the 5 most downloaded Sensors Journal Papers in September 2016) 

• Junghyup Lee, Arup K. George and Minkyu Je, “A 1.4V 10.5MHz Swing-Boosted Differential Relaxation Oscillator with 162.1dBc/Hz FoM and 9.86psrms Period Jitter in 0.18μm CMOS", in Proc. IEEE Int. Solid-State Circuits Conference (ISSCC), Feb. 2016, pp. 106-107. (The world’s top semiconductor conference)

• Junghyup Lee, Pyoungwon Park, SeongHwan Cho and Minkyu Je, “A 4.7MHz 53μW Fully Differential CMOS Reference Clock Oscillator with –22dB Worst-Case PSNR for Miniaturized SoCs,” in Proc. IEEE Int. Solid-State Circuits Conference (ISSCC), Feb. 2015, pp. 106–107. (The world’s top semiconductor conference)

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• KulKarni, V. V., Junghyup Lee, Xin Liu, Minkyu Je “A Reference-Less Injection-Locked Clock-Recovery Scheme for Multilevel-Signaling-Based Wideband BCC Receivers,” IEEE Trans. Microwave Theory and Techniques, vol. 62, no. 9, pp. 1856–1866, Aug. 2014. (Top journal in the field of microwave) 

• Chee Keong Ho, Jia Hao Cheong, Junghyup Lee, Kulkarni, V. V., Peng Li, Xin Liu, Minkyu Je, “High Bandwidth Efficiency and Low Power Consumption Walsh Code Implementation Methods for Body Channel Communication,” IEEE Trans. Microwave Theory and Techniques (TMTT), vol. 62, no. 9, pp. 1867–1878, Aug. 2014.

• Junghyup Lee, Vishal Vinayak Kulkarni, Chee Keong Ho, Jia Hao Cheong, Peng Li, Jun Zhou, Wei Da Toh, Xin Zhang, Yuan Gao, Kuang Wei Cheng, Xin Liu, and Minkyu Je, “A 60Mb/s Wideband BCC Transceiver with 150pJ/b RX and 31pJ/b TX for Emerging Wearable Applications,” in Proc. IEEE Int. Solid-State Circuits Conference (ISSCC), Feb. 2014, pp. 498–499. (The world’s top semiconductor conference)

• Kulkarni, V. V., Junghyup Lee, Xin Liu, Minkyu Je, “A 100 Mb/s 0.36 mW injection locked clock and data recovery circuit for WBAN transceivers,” in Proc. IEEE MTT-S Int. Microw. Symp. Workshop, Dec. 2013, pp. 1-3.  

• Junghyup Lee and SeongHwan Cho, “A 1.4-μW 24.9-ppm/°C Current Reference with Process-Insensitive Temperature Compensation in 0.18-μm CMOS,” IEEE J. Solid-State Circuits, vol. 47, no. 10, pp. 2527–2533, Oct. 2012. (The world’s top IC design journal)

• Junghyup Lee and SeongHwan Cho, “A 210 nW 29.3 ppm/°C 0.7 V Voltage Reference with a Temperature Range of -50 to 130 °C in 0.13 μm CMOS,” in Proc. IEEE Symp. VLSI Circuits (VLSIC), Jun. 2011, pp. 278–279. (One of the world’s 3 top semiconductor conferences) 

• Junghyup Lee and SeongHwan Cho, “A 10 MHz 80 μW 67 ppm/°C CMOS Reference Clock Oscillator with a Temperature Compensated Feedback Loop in 0.18 μm CMOS,” in Proc. IEEE Symp. VLSI Circuits (VLSIC), Jun. 2009, pp. 226–227. (One of the world’s 3 top semiconductor conferences)

• Sung-Sik Woo, Junghyup Lee and SeongHwan Cho, “A Ring Oscillator-based Temperature Sensor for U-Healthcare in 0.13 μm CMOS,” in Proc. IEEE Int. SoC Design Conference, 2009, pp. 548–551. 

• Junghyup Lee and SeongHwan Cho, “A 80 μW, 10 MHz CMOS Reference Clock Generator with High Frequency Stability,” in Proc. Korean Conference on Semiconductors (KCS), Feb. 2009. (Best Design Award)

• Joonhee Lee, Kyunglok Kim, Junghyup Lee, Taekwang Jang, SeongHwan Cho, “A 480-MHz to 1-GHz sub-picosecond clock generator with a fast and accurate automatic frequency calibration in 0.13-µm CMOS,” in Proc. IEEE Asian Solid-State Circuits Conference (ASSCC), Nov. 2007, pp. 67-70. 

• Youngsoo Shin and Junghyup Lee, “Power analysis of VLSI interconnect with RLC tree models and model reduction,” Journal of Circuits, Systems, and Computers, vol. 15, no. 3, pp. 399-408, June 2006.