Total: 140 publications – 1 book, 4 book chapters, 59 journal papers, and 76 peer-reviewed conference papers

Prof. Ha and his colleagues’ book on integrated neural interfaces is now available:
Sohmyung Ha, Chul Kim, Patrick Mercier, and Gert Cauwenberghs, “High-Density Integrated Electrocortical Neural Interfaces,” Academic Press (Elsevier), 2019

 

 

 

 

 

 

 

 

————– Under review or revision ————–

TBioCAS, ISCAS, CICC, JSSC

————– 2025 ————– 

[J59] Woojin Ahn, Kim-Hoang Nguyen, Hoseung Lee, Kyou Sik Min, Sohmyung Ha*, and Minkyu Je*, “An Energy-Efficient Stimulation System Based on Adaptive Dynamic Voltage Switching Control for Cochlear Implants,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), 2025. Early Access *Co-corresponding authors

[C76] Donghyun Youn, Kyeongwon Jeong, Woongro Youn, Hoyong Seong, Yechan Park, Sohmyung Ha, and Minkyu Je, “An 18.5 nF-Input-Range PM-SAR Hybrid Capacitance-to-Digital Converter Achieving 6.1 μs Conversion Time at 18.1 pF Input Capacitance”, IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 16-20, 2025.

[C75] Gichan Yun, Haidam Choi, Yoontae Jung, Jiho Myung, Sein Oh, Sohmyung Ha, and Minkyu Je, “A 189.3 dB-FOMS 14.5fJ/Conversion-Step Continuous-Time Noise-Shaping SAR Capacitance-to-Digital Converter”, IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 16-20, 2025.

————– 2024 ————– 

[J58] Haidam Choi¹, Song-I Cheon¹, Gichan Yun, Sein Oh, Ji-Hoon Suh, Sohmyung Ha*, and Minkyu Je*, “A Bio-Impedance Readout IC with Complex-Domain Noise-Correlated Baseline Cancellation,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 59, No. 11, pp. 3538-3548, November 2024. ¹Co-first authors, *Co-corresponding authors

[C70] Yegeun Kim, Changhun Seok, Kyeongwon Jeong, Haidam Choi, Heewon Choee, Sohmyung Ha, and Minkyu Je, “A 5.3-μW 80.8-dB SNDR LNA-Embedded EF-CIFF Third-Order Noise-Shaping SAR ADC for Closed-Loop Neural Recording,” Proceedings of European Solid-State Electronics Research Conference (ESSERC), September 9-12, 2024.

[C69] ByeongSeon Choi, Edward Choi, Donghyeon Yi, Jiho Chun, Sohmyung Ha, Ik-Joon Chang, and Minkyu Je, “AR-CIM: A 460.22TOPS/W SRAM-based Analog Reconfigurable Computing-in-Memory Macro with 1/2/4/8-Bit Variable Precision,” Proceedings of European Solid-State Electronics Research Conference (ESSERC), September 9-12, 2024.

[J57] Donghyun Youn, Youngin Kim, Injun Choi, Yoontae Jung, Hyuntak Jeon, Kyungtae Lee, Soon-Jae Kweon*, Sohmyung Ha*, and Minkyu Je*, “A Wide-Dynamic-Range, DC-Coupled, Time-Based Neural-Recording IC with Optimized CCO Frequency,” IEEE Access, Vol. 6, pp. 94354-94366, 2024. *Co-corresponding authors

[C65] Hyungjoo Cho, Dongyoon Lee, Hoyong Sung, Heewon Choe, Ji-Hoon Suh, Sohmyung Ha, and Minkyu Je, “An Intra-Body-Power-Transfer System Energized by an Electromagnetic Energy Harvester for Powering Wearable Sensor Nodes,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 16-20, 2024.

[C64] Haidam Choi, Gichan Yun, Ji-Hoon Suh, Sein Oh, Song-I Cheon, Yoontae Jung, Sohmyung Ha, and Minkyu Je , “A fully dynamic 1st-order Δ-ΔΣ Modulator with a 468mVpp input range for Electrical Impedance Tomography Systems,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 16-20, 2024.

[C63] Ji-Hoon Suh, Haidam Choi, Yoontae Jung, Sohmyung Ha, and Minkyu Je, “A 5.7kfps Fast Neural Electrical Impedance Tomography IC Based on Incremental Zoom Structure with Baseline Cancellation for Peripheral Nerve Monitoring Systems,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 16-20, 2024.

[C62] Edward Choi*, Vincent Lukito*, Injun Choi, Seoyoung Lee, Ik-Joon Chang, Sohmyung Ha, and Minkyu Je, “A Δ-Based Spike Sorting SoC with End-to-End Implementation of Event-Driven Binary Autoencoder Neural Network in Analog CIM Achieving 94.54% Accuracy and 3.11µW/ch,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 16-20, 2024. *Equally Credited Authors

[C61] Aida Aberra, Muhammad Abrar Akram, Soon-Jae Kweon, Jongmin Kim, Kim-Hoang Nguyen, Gichan Yun, Yong-Ak Song, Minkyu Je, and Sohmyung Ha, “A Hybrid High-voltage Regulating Charge Pump for Electrokinetic Concentration,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C60] Karam Ellahi, Soon-Jae Kweon, Asra Malik, Muhammad Abrar Akram, Song-I Cheon, Yoontae Jung, Minkyu Je, Hammad M. Cheema, and Sohmyung Ha, “A High-Throughput Impedance Measurement IC Using Synchronous Cyclic Integration Technique,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C59] Asra Malik, Soon-Jae Kweon, Karam Ellahi, Muhammad Abrar Akram, Song-I Cheon, Yoontae Jung, Minkyu Je, Hammad M. Cheema, and Sohmyung Ha, “A High-Throughput Impedance Measurement IC with Baseline-Canceling Peak Detector,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C58] Muhammad Haris Farooq, Muhammad Abrar Akram, Shirin Qaisar, Soon-Jae Kweon, Hammad M. Cheema, and Sohmyung Ha, “A Tri-Loop Fast-Transient Digital LDO with Adaptive-Gain Control and Fine-Loop Freezer,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C57] Shirin Qaisar, Muhammad Abrar Akram, Muhammad Haris Farooq, Soon-Jae Kweon, Hammad M. Cheema, and Sohmyung Ha, “An Analog-Assisted Fast-Transient Digital LDO with a Charge-pump-Based Fine Loop Achieving 0.14-mV Output Voltage Ripples,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C56] Sunglim Han, Hoyong Seong, Sein Oh, Jimin Koo, Hanbit Jin, Hye Jin Kim, Sohmyung Ha, and Minkyu Je, “A 72-Channel Resistive-Sensor Interface IC with High Energy Efficiency and a Wide Input Range,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.
 – Best Paper Award in the Biomedical and Life Science Circuits and Systems (BioCAS) Track, IEEE International Symposium on Circuits and Systems, 2024

[C55] Jimin Koo, Yoontae Jung, Sein Oh, Sunglim Han, Sohmyung Ha, and Minkyu Je, “A Reconfigurable Multimodal Sensor Interface IC Based on Direct-Conversion ΔΣ Modulator Structure,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C54] Haidam Choi, Ji-Hoon Suh, Gichan Yun, Sein Oh, Sohmyung Ha, and Minkyu Je, “A Low-Power ∆-∆Σ-Based Bio-Impedance Readout IC with Capacitive-Feedback Baseline Cancellation,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C53] Song-I Cheon, Seonghyun Park, Haidam Choi, Yebin Choi, Minho Seok, Young-Ho Cho, Sohmyung Ha, and Minkyu Je, “Ultrahigh-G Accelerometer Readout IC with Adaptive Gain Path for Shock Resilience,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[C52] Yegeun Kim, Changhun Seok, Yoontae Jung, Sohmyung Ha, and Minkyu Je, “A Biopotential Recording IC with <10-ms-Settling Hybrid DC Servo Loop,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 19-22, 2024.

[J56] Donghyeon Yi, Seoyoung Lee, Injun Choi, Gichan Yun, Edward Jongyoon Choi, Jonghee Park, Jonghoon Kwak, Sung-Joon Jang, Sohmyung Ha*, Ik Joon Chang*, and Minkyu Je*, “Skew-CIM: Process-Variation-Resilient and Energy-Efficient Computation-in-Memory Design Technique with Skewed Weights,” IEEE Transactions on Circuits and Systems I: Regular Papers (TCAS-I), Vol. 71, No. 5, pp. 2067-2078, May 2024. *Co-corresponding authors

[J55] Keonghwan Oh, Mohsin Mohammed, Revathi Sukesan, Aleksa Petković, Dipesh Chaudhury, and Sohmyung Ha, “Optic-fiber-based optogenetic stimulator with µLED and 3D-printed structures for brain stimulation,” IEEE Access, Vol. 12, pp. 46319-46328, 2024.

[J54] Yoontae Jung¹, Sein Oh¹, Sohmyung Ha*, and Minkyu Je*, “A 187-dB FoM_S Power-Efficient 2^nd -order Highpass ∆Σ Capacitance-to-Digital Converter,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 59, No. 4, pp. 1204-1215, April 2023. ¹Co-first authors, *Co-corresponding authors

[J53] Gichan Yun, Kyeongwon Jeong, Haidam Choi, Seunghyeon Nam, Chaerin Oh, Hyunjoo Lee, Sohmyung Ha*, and Minkyu Je*, “An Ultrasound Receiver with Bandwidth-enhanced Current Conveyor and Element-level Ultrasound Transmitter for Ultrasound Imaging Systems,” IEEE Solid-State Circuits Letters (SSCL), Vol. 7, pp. 98-101, 2024. *Co-corresponding authors

[J52] Keonghwan Oh and Sohmyung Ha, “3D-printed Dual-color Optogenetic Neural Stimulator,” IEEE Photonics Technology Letters, Vol. 36, No. 6, pp. 401-404, March 2023. 

[C51] Muhammad Abrar Akram, Aida Aberra, Soon-Jae Kweon, and Sohmyung Ha, “An Amplifier-less CMOS Potentiostat IC Consuming 3.7nW Power over Entire Dynamic Range of 129.5dB for Electrochemical Biosensing,” IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 18-22, 2024.

[C50] Song-I Cheon¹, Haidam Choi¹, Gichan Yun, Sein Oh, Ji-Hoon Suh, Sohmyung Ha, and Minkyu Je, “A Two-electrode Bio-impedance Readout IC with Complex-domain Noise-correlated Baseline Cancellation Supporting Sinusoidal Excitation,” IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 18-22, 2024. ¹Co-first authors. Invited to publication in IEEE Journal of Solid-State Circuits (JSSC).

[J51] Kyeongwon Jeong, Sohmyung Ha*, and Minkyu Je* “A 15.4-ENOB, 4th-order Truncation-Error Shaping NS-SAR-Nested ∆Σ Modulator with Boosted Input Impedance and Range for Biosignal Acquisition,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 59, No. 2, pp. 528-539, February 2023. *Co-corresponding authors

[J50] Song-I Cheon¹, Haidam Choi¹, Hyoju Kang, Ji-Hoon Suh, Seonghyun Park, Soon-Jae Kweon*, Minkyu Je*, and Sohmyung Ha*, “Impedance-Readout Integrated Circuits for Electrical Impedance Spectroscopy: Methodological Review,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 18, No. 1, pp. 215-232, February 2023. ¹Co-first authors, *Co-corresponding authors

————– 2023 ————– 

[C49] Gichan Yun, Kyeongwon Jeong, Haidam Choi, Seunghyeon Nam, Chaerin Oh, Hyunjoo Lee, Sohmyung Ha, and Minkyu Je, “A 2pA/√Hz Current-Conveyor-Assisted Ultrasound Receiver with 25pF CMUT Parasitic Capacitance“, Proceedings of IEEE Asian Solid-State Circuits Conference (A-SSCC), Hainan, China, November 5-8, 2023.

[J49] Chongsoo Jung, Hoyong Seong, Injun Choi, Sohmyung Ha*, and Minkyu Je*, “A Process-Scalable Ultra-Low-Voltage Sleep Timer with a Time-Domain Amplifier and a Switch-less Resistance Multiplier,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 58, No. 10, pp. 2675-2684, October 2023. *Co-corresponding authors

[J48] Kyeongwon Jeong, Gichan Yun, Jaesuk Choi, Injun Choi, Jeehoon Son, Jae Youn Hwang, Sohmyung Ha*, and Minkyu Je*, “A Wide-bandwidth Ultrasound Receiver and On-chip Ultrasound Transmitter for Ultrasound Capsule Endoscopy,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 58, No. 10, pp. 2778-2789, October 2023. *Co-corresponding authors

[J47] Jongkil Park, Sohmyung Ha, Theodore Yu, Emre Neftci, and Gert Cauwenberghs, “A 22-pJ/spike 73-Mspikes/s 130k-compartment Neural Array Transceiver with Conductance-based Synaptic and Membrane Dynamics,” Frontiers in Neuroscience, Vol. 17, 2023.

[J46] Muhammad Abrar Akram and Sohmyung Ha, “A Differential Rectifier with V_TH Compensation for High-frequency RF Inputs,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 17, No. 4, pp. 653-663, August 2023.

[C48] Keonghwan Oh, Jihong Lim, Hyunjoo Jenny Lee, and Sohmyung Ha, “3D-printed Optogenetic Stimulator Integrated with a Recording Channel,” Proceedings of IEEE Biosensors Conference, London, UK, July 30 – August 1, 2023. 
 – Best Paper Award – Third Place

[C47] Yoontae Jung*, Sein Oh*, Jimin Koo, Seunga Park, Ji-Hoon Suh, Donghee Cho, Sohmyung Ha, and Minkyu Je “A 187dB FoMS 46fJ/Conv. 2nd-order Highpass ΔΣ Capacitance-to-Digital Converter,” Symposium on VLSI Circuits Digest of Technical Papers, Kyoto, Japan, June 11-16, 2023. *Equally Credited Authors.

[C46] Sein Oh, Seunga Park, Yoontae Jung, Jimin Koo, Donghee Cho, Sohmyung Ha, and Minkyu Je, “A 2.5mW 12MHz-BW 69dB SNDR Passive Bandpass ΔΣ ADC with Highpass Noise-Shaping SAR Quantizers,” Symposium on VLSI Circuits Digest of Technical Papers, Kyoto, Japan, June 11-16, 2023.

[C45] Woojin Ahn, Nguyen Kim Hoang, Jungwoo Lim, Kyou Sik Min, Hoseung Lee, Sohmyung Ha, and Minkyu Je, “An Energy-Efficient, Scalable Neural Stimulation IC with Adaptive Dynamic Voltage Switching for Cochlear Implant System,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, California, USA, May 21-25, 2023. 

[C44] Edward Choi, Injun Choi, Vincent Lukito, Dong-Hwi Choi, Donghyeon Yi, Ik-Joon Chang, Sohmyung Ha, and Minkyu Je, “A 333TOPS/W Logic-Compatible Multi-Level Embedded Flash Compute-In-Memory Macro with Dual-Slope Computation,” Proceedings of IEEE Custom Integrated Circuits Conference (CICC), San Antonio, TX, USA, April 23-26, 2023.

[C43] Hoyong Seong, Donghyun Youn, Injun Choi, Junghyup Lee, Sohmyung Ha, and Minkyu Je, “A 0.9V 2MHz 6.4x-Slope-Boosted Quadrature-Phase Relaxation Oscillator with 164.2dBc/Hz FoM and 62.5ppm Period Jitter in 0.18μm CMOS,” Proceedings of IEEE Custom Integrated Circuits Conference (CICC), San Antonio, TX, USA, April 23-26, 2023.

[J45] Ji-Hoon Suh, Haidam Choi, Yoontae Jung, Sein Oh, Hyungjoo Cho, Nahmil Koo, Seong Joong Kim, Chisung Bae, Sohmyung Ha*, and Minkyu Je*, “A 16-channel Impedance-Readout IC with Synchronous Sampling and Baseline Cancellation for Fast Neural Electrical Impedance Tomography,” IEEE Solid-State Circuits Letters (SSCL), Vol. 6, pp. 109-112, 2023. *Co-corresponding authors

[J44] Hyungjoo Cho, Ji-Hoon Suh, Gichan Yun, Sohmyung Ha*, and Minkyu Je*, “An Intra-Body Power Transfer System with Continuous Maximum Resonant Power Tracking,” IEEE Solid-State Circuits Letters (SSCL), Vol. 6, pp. 105-108, 2023. *Co-corresponding authors

[J43] Hicham Meskher, Teqwa Ragdi, Amrit Kumar Thakur, Sohmyung Ha, Issam Khelfaoui, Ravishankar Sathyamurthy, Swellam W. Sharshir, A. K. Pandey, and Rahman Saidur, “A Review on CNTs-based Electrochemical Sensors and Biosensors: Unique Properties and Potential Applications,” Critical Reviews in Analytical Chemistry, 2023. 

[J42] Unbong Lee, Wanyeong Jung, Sohmyung Ha*, and Minkyu Je*, “An Auto-reconfigurable Multi-output Regulating Switched-capacitor DC-DC Converter for Wireless Power Reception and Distribution in Multi-unit Implantable Devices,” IEEE Open Journal of the Solid-State Circuits Society (OJ-SSCS), Vol. 3, pp. 65-75, 2023. *Co-corresponding authors

[J41] Donghee Cho, Hyungjoo Cho, Sein Oh, Yoontae Jung, Sohmyung Ha, Chul Kim, and Minkyu Je, “A High-Efficiency Single-Mode Dual-Path Buck-Boost Converter with Reduced Inductor Current,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 58, No. 3, pp. 720-731, March 2023.

[J40] Muhammad Abrar Akram and Sohmyung Ha, “A 434-MHz Bootstrap Rectifier with Dynamic V_TH Compensation for Wireless Biomedical Implants,” IEEE Transactions on Power Electronics (TPEL), Vol. 38, No. 2, pp. 1423-1428, February 2023.

[J39] Song-I Cheon, Soon-Jae Kweon, Aida Aberra, Minkyu Je*, and Sohmyung Ha*, “Optimal Parameter Design of DAC-based Sinusoidal Signal Generators for Electrical Impedance Spectroscopy,” IEEE Transactions on Instrumentation and Measurement, Vol. 72, pp. 1-11, 2023. *Co-corresponding authors

————– 2022 ————– 

[C42] Ahmed Elsaid, Wanjoo Park, Sohmyung Ha, Yong-Ak Song, and Mohamad Eid, “Effects of Duration and Envelope of Vibrotactile Alerts on Urgency, Annoyance, and Acceptance,” AsiaHaptics 2022, Beijing, China, 12–14 November 2022.

[C41] Hyungjoo Cho, Ji-Hoon Suh, Gichan Yun, Sohmyung Ha, and Minkyu Je, “An Intra-Body-Power-Transfer System with a PLL-based Continuous Maximum Resonant Power Tracking Loop at TX and 1.8V DC Output Voltage at RX,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Taipei, Taiwan, November 6-9, 2022.

[C40] Hoyong Seong, Chongsoo Jung, Donghyun Youn, Junghyup Lee, Sohmyung Ha, and Minkyu Je, “A 118.6fJ/Conversion-Step Two-Step Time-Domain RC-to-Digital Converter With 33nF/10MΩ Range and 53aFrms Resolution,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Taipei, Taiwan, November 6-9, 2022.

[C39] Ji-Hoon Suh, Haidam Choi, Yoontae Jung, Sein Oh, Hyungjoo Cho, Nahmil Koo, Seong Joong Kim, Chisung Bae, Sohmyung Ha, and Minkyu Je, “A Synchronous-Sampling Impedance-Readout IC with Baseline-Cancellation-Based Two-Step Conversion for Fast Neural Electrical Impedance Tomography,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Taipei, Taiwan, November 6-9, 2022.

[C38] Chongsoo Jung, Hoyong Seong, Injun Choi, Sohmyung Ha, and Minkyu Je, “A Process-Scalable Ultra-Low-Voltage 180kHz Sleep Timer with a Time-Domain Amplifier and a Switch-less Resistance Multiplier,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Taipei, Taiwan, November 6-9, 2022.

[C37] Kyeongwon Jeong, Jaesuk Choi, Gichan Yun, Jeehoon Son, Jae Youn Hwang, Sohmyung Ha, and Minkyu Je, “20-MHz 2.3-mW Receiver and a 25-V Transmitter for Ultrasound Capsule Endoscopy,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Taipei, Taiwan, November 6-9, 2022.

[C36] Muhammad Abrar Akram and Sohmyung Ha, “A 433.92-MHz CMOS Rectifier with Dynamic V_TH-Reduction for Wireless Biomedical Implants,” Proceedings of IEEE Biomedical Circuits and Systems Conference (BioCAS), Taipei, Taiwan, October 13-15, 2022.
 – Invited to IEEE Transactions on Biomedical Circuits and Systems (TBioCAS)

[J38] Hyungjoo Cho, Ji-Hoon Suh, Chul Kim, Sohmyung Ha*, and Minkyu Je*, “An Intra-Body Power Transfer System with >1-mW Power Delivered to the Load and 3.3-V DC Output at 160-cm of On-Body Distance,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 16, No. 5, pp. 852-866, October 2022. (Also presented in ISICAS) *Co-corresponding authors

[J37] Edward Choi, Injun Choi, Chanhee Jeon, Gichan Yun, Donghyeon Yi, Sohmyung Ha*, Ik Joon Chang*, and Minkyu Je*, “SRAM-based Computing-in-Memory Macro with Fully Parallel One-Step Multi-Bit Computation,” IEEE Solid-State Circuits Letters (SSCL), Vol. 5, pp. 234-237, 2022. *Co-corresponding authors

[J36] Yoontae Jung, Soon-Jae Kweon, Hyuntak Jeon, Injun Choi, Jimin Koo, Mi Kyung Kim, Hyunjoo Jenny Lee, Sohmyung Ha*, and Minkyu Je*, “A Wide-Dynamic-Range Neural-Recording IC with Automatic-Gain-Controlled AFE and CT Dynamic-Zoom ∆Σ ADC for Saturation-Free Closed-Loop Neural Interfaces,” IEEE Journal of Solid-State Circuits (JSSC), Vol. 57, No. 10, pp. 3071-3082, October 2022. *Co-corresponding authors

[J35] Kyeongwon Jeong, Yoontae Jung, Gichan Yun, Donghyun Youn, Yehhyun Jo, Hyunjoo Lee, Sohmyung Ha*, and Minkyu Je*, “A PVT-Robust AFE-Embedded Error-Feedback Noise-Shaping SAR ADC with Chopper-Based Passive High-Pass IIR Filtering for Direct Neural Recording,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 16, No. 4, pp. 679-691, August 2022. *Co-corresponding authors

[J34] Hicham Meskher, Fethi Achi, Sohmyung Ha, Bahria Berregui, Fatiha Babanini, and Hakim Belkhalfa, “Sensitive rGO/MOF based electrochemical sensor for penta-chlorophenol detection: a novel artificial neural network (ANN) application,” Sensors & Diagnostics, Vol. 1, No. 5, pp. 1032-1043, 2022.

[J33] Yoontae Jung¹, Soon-Jae Kweon¹, Taeju Lee, Kyeongwon Jeong, Sohmyung Ha*, and Minkyu Je*, “Dynamic-Range-Enhancement Techniques for Artifact-Tolerant Biopotential-Acquisition ICs,” IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 69, No. 7, pp. 3090-3095, 2022. ¹Co-first authors, *Co-corresponding authors

[C35] Kyeongwon Jeong, Gichan Yun, Sohmyung Ha, and Minkyu Je, “A 600mVPP-Input-Range 94.5dB-SNDR NS-SAR-Nested DSM with 4th-Order Truncation-Error Shaping and Input-Impedance Boosting for Biosignal Acquisition,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 12-17, 2022.

[C34] Phan Dang Hung, Hongseok Shin, Yechan Park, Nguyen Kim Hoang, Donghee Cho, Sohmyung Ha, Chul Kim, and Minkyu Je, “A 96.5%-Power-Efficiency Hybrid Buck-Boost Photovoltaic Energy Harvester Employing Adaptive FOCV MPPT Control for >98% MPPT Efficiency Across a 10,000× Dynamic Range,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 12-17, 2022.

[J32] Soon-Jae Kweon, Ayesha Kajol Rafi, Song-I Cheon, Minkyu Je, and Sohmyung Ha, “On-chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 16, No. 3, pp. 337-360, June 2022.

[J31] Injun Choi, Jongyoon Choi, Donghyeon Yi, Yoontae Jung, Hoyong Seong, Hyuntak Jeon, Soon-Jae Kweon, Ik-Joon Chang*, Sohmyung Ha*, and Minkyu Je, “An SRAM-Based Hybrid Computation-in-Memory Macro Using Current-Reused Differential CCO,” IEEE Journal on Emerging and Selected Topics in Circuits and Systems (JETCAS), Vol. 12, No. 2, pp. 536-546, 2022. *Co-corresponding authors

[J30] Soon-Jae Kweon, Jeong-Ho Park, Chong-Ook Park, Hyung-Joun Yoo, and Sohmyung Ha, “Wireless Kitchen-Fire Prevention System Using Electrochemical Carbon Dioxide Gas Sensor for Smart Home,” Sensors (MDPI), Vol. 22, No. 11, 3965, 2022.

[J29] Hicham Meskher, Achi Fethi, Sohmyung Ha, and Bachari Khaldoun, “Antifouling double layers of functionalized-multi-walled carbon nanotubes coated ZnO for sensitive and selective electrochemical detection of catechol,” Fullerenes, Nanotubes and Carbon Nanostructures, Vol. 30, No. 3, 2022. 

[C33] Edward Choi, Injun Choi, Chanhee Jeon, Gichan Yun, Donghyeon Yi, Sohmyung Ha, Ik Joon Chang, and Minkyu Je, “A 133.6TOPS/W Compute-In-Memory SRAM Macro with Fully Parallel One-Step Multi-Bit Computation“, Proceedings of IEEE Custom Integrated Circuits Conference (CICC), Newport Beach, CA, USA, April 24 – April 27, 2022.

[C32] Donghee Cho, Hyungjoo Cho, Sein Oh, Yoontae Jung, Sohmyung Ha, Chul Kim, and Minkyu Je, “A Single-Mode Dual-Path Buck-Boost Converter with Reduced Inductor Current Across All Duty Cases Achieving 95.58% Efficiency at 1A in Boost Operation“, Proceedings of IEEE Custom Integrated Circuits Conference (CICC), Newport Beach, CA, USA, April 24 – April 27, 2022.

[J28] Hicham Meskher, Achi Fethi, Ahmed Zouaoui, Sohmyung Ha, Martin Peacock, and Hakim Belkhalfa, “Simultaneous and selective electrochemical determination of catechol and hydroquinone on a nickel oxide (NiO) reduced graphene oxide (rGO) doped multiwalled carbon nanotube (fMWCNT) modified platinum electrode,” Analytical Letters, Vol. 55, No. 9, pp. 1466-1481, 2022.

[J27] Song-I Cheon, Soon-Jae Kweon, Youngin Kim, Jimin Koo, Sohmyung Ha*, and Minkyu Je*, “An Impedance Readout IC with Ratio-Based Measurement Techniques for Electrical Impedance Spectroscopy,” Sensors (MDPI), Vol. 22, No. 4, 1563, 2022. *Co-corresponding authors

[BC3] Aida Aberra, Young-Han Kim, Minkyu Je, and Sohmyung Ha, “Backscatter Communication for Biomedical Devices,” Handbook of Biochips (Mohamad Sawan Ed.), Springer (New York, NY, USA), 2022.

[J26] Young In Kim, Soon-Jae Kweon, Sohmyung Ha, Chong Soo Jung, and Minkyu Je, “Design of a Current-Controlled Oscillator for Wide-Dynamic-Range, Time-Based, Delta-Sigma Modulator,” Journal of Integrated Circuits and Systems, Vol. 8, No. 1, 2022.

————– 2021 ————– 

[J25] Song-i Cheon, Soon-Jae Kweon, Youngin Kim, Sohmyung Ha*, and Minkyu Je*, “A Polar-demodulation-based Impedance-measurement IC Using Frequency-shift Technique with Low Power Consumption and Wide Frequency Range,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 15, No. 6, pp. 1210-1220, 2021. *Co-corresponding authors

[J24] Yechan Park, Seok-Tae Koh, Jeongeun Lee, Hongkyun Kim, Jaesuk Choi, Sohmyung Ha, Chul Kim, and Minkyu Je, “A Wireless Power and Data Transfer IC for Neural Prostheses Using a Single Inductive Link with Frequency-Splitting Characteristic,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 15, No. 6, pp. 1306-1319, 2021.

[C31] Yoontae Jung, Soon-Jae Kweon, Hyuntak Jeon, Taeju Lee, Kyeongwon Jeong, Chongsoo Jung, Mi Kyung Kim, Hyunjoo Jenny Lee, Sohmyung Ha, and Minkyu Je, “A 99.5dB-DR 5kHz-BW Closed-Loop Neural-Recording IC Based on Continuous-Time Dynamic-Zoom ΔΣADC with Automatic AFE-Gain Control,” Proceedings of the Asian Solid-State Circuits Conference (A-SSCC), Busan, Korea, November 7 – 10, 2021.

[C30] Jinuk Kim, Hongseok Shin, Soon-Jae Kweon, Seongwook Lee, Sohmyung Ha, and Minkyu Je, “A Scalable Readout IC Based on Wideband Noise Cancelling for Full-Rate Scanning of High-Density Microelectrode Arrays,” Proceedings of the 43rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Virtual, October 31 – November 4, 2021.

[J23] Soon-Jae Kweon, Woojin Yun, Hyunwoo Park, Jeong-Ho Park, Jung Hoon Lee, Jin Lee, Minkyu Je, Sohmyung Ha*, and Choul-Young Kim*, “A Precise Lesion Localization System Using a Magnetometer with Real-time Baseline Cancellation for Laparoscopic Surgery,” IEEE Access, Vol. 9, pp. 131648-131657, 2021. *Co-corresponding authors

[J22] Qiwei Chen, Sanja Kastratovic, Mohamad Eid, and Sohmyung Ha, “A Non-contact Compact Portable ECG Monitoring System,” Electronics (MDPI), Vol. 10, No. 18, 2279, 2021.

[C29] Donghee Cho, Hongseok Shin, Hyunwoo Park, Sein Oh, Taeju Lee, Sohmyung Ha, Chul Kim, and Minkyu Je, “A Load-Current-Regulating OLED Lamp Driver Using a Hybrid Step-Up Converter with 93.21% Efficiency at a High Conversion Ratio of 4.1,” Proceedings of European Solid-State Circuits Conference (ESSCIRC), Grenoble, France, September 6-9, 2021.

[C28] Keonghwan Oh, Yong-Ak Song, and Sohmyung Ha, “Optogenetic Stimulator with μLED-coupled Optical Fiber on Flexible Substrate via 3D Printed Mount,” Proceedings of the International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), June 20-25, 2021.

[C27] Soon-Jae Kweon, Joonho Gil, Chulhyun Park, Sein Oh, Yoontae Jung, Injun Choi, Song-i Cheon, Hung Phan Dang, Ja-Hyuck Koo, Geunhoe Kim, Sohmyung Ha, and Minkyu Je, “An 8MHz 31.25kS/s Impedance-Monitoring IC Based on IF-Sampling Architecture with a Band-Pass Delta-Sigma ADC,” Symposium on VLSI Circuits Digest of Technical Papers, Kyoto, Japan, June 13-19, 2021. 

[C26] Hongseok Shin, Doojin Jang, Gyeong-Gu Kang, Jinuk Kim, Sohmyung Ha, and Minkyu Je, “A 96.6%-Efficiency Continuous-Input-Current Hybrid Dual-Path Buck-Boost Converter with Single Mode Operation and Non-Stopping Output Current Delivery,” Symposium on VLSI Circuits Digest of Technical Papers, Kyoto, Japan, June 13-19, 2021. 

[C25] Phan Dang Hung, Yechan Park, Soon-Jae Kweon, Taeju Lee, Hyuntak Jeon, Seok-Tae Koh, Incheol Cho, Jun-Bo Yoon, Inkyu Park, Chul Kim, Sohmyung Ha, and Minkyu Je, “A Self-Powered Wireless Gas Sensor Node Based on Photovoltaic Energy Harvesting,” Symposium on VLSI Circuits Digest of Technical Papers, Kyoto, Japan, June 13-19, 2021. 

[J21] Muhammad Abrar Akram, Wook Hong, Sohmyung Ha*, and In-Chul Hwang*, “Capacitor-less Dual-mode All-Digital LDO with ΔΣ-modulation-based Ripple Reduction,” IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 68, No. 5, May 2021. (Invited from ISCAS 2021) *Co-corresponding authors

[C24] Song-i Cheon, Soon-Jae Kweon, Youngin Kim, Sohmyung Ha, and Minkyu Je, “A Power-efficient, Wide-frequency-range Impedance Measurement IC Using Frequency-shift Technique,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea, May 22-28, 2021.

[J20] Muhammad Abrar Akram, In-Chul Hwang, and Sohmyung Ha, “Power Delivery Networks for Embedded Mobile SoCs: Architectural Advancements and Design Challenges,” IEEE Access, Vol. 9, pp. 46573-46588, 2021.

[C23] Yechan Park, Seok-Tae Koh, Jeongeun Lee, Hongkyun Kim, Jaesuk Choi, Sohmyung Ha, Chul Kim, and Minkyu Je, “A Frequency-Splitting-Based Wireless Power and Data Transfer IC for Neural Prostheses with Simultaneous 115mW Power and 2.5Mb/s Forward Data Delivery,” IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 14-18, 2021.

[C22] Jaesuk Choi, Yechan Park, Jung Bum Oh, Jun-Young Kim, Jae Youn Hwang, Sohmyung Ha, Chul Kim, and Minkyu Je, “An Energy-Replenishing Ultrasound Pulser with 0.25CV²f Dynamic Power Consumption,” IEEE International Solid-State Circuits Conference (ISSCC) Digest of Technical Papers, San Francisco, CA, USA, February 14-18, 2021.

Muhammad Abrar Akram, Sohmyung Ha, and In-Chul Hwang, “Frequency-referenced Digital LDO For Fine-Grained DVFS in Integrated-Power Delivery Network,” International Conference on Electronics, Information, and Communication (ICEIC), Jan. 31 – Feb. 3, 2021.

[J19] Muhammad Abrar Akram, Kyeong-Sung Kim, Sohmyung Ha*, and In-Chul Hwang*, “Output-Capacitorless Tri-Loop Digital Low-Dropout Regulator Achieving 99.91 % Current Efficiency and 2.87-fs FOM,” IEEE Transactions on Power Electronics (TPEL), Vol. 36, No. 2, pp. 2044-2058, Feb. 2021. *Co-corresponding authors

[J18] Jaesuk Choi, Sangyeon Youn,  Jae Youn Hwang, Sohmyung Ha, Chul Kim, and Minkyu Je, “Energy-Efficient High-Voltage Pulsers for Ultrasound Transducers,” IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 68, No. 1, pp. 19-23, January 2021.

————– 2020 ————– 

[J17] Muhammad Abrar Akram, Kai-Wen Yang, and Sohmyung Ha, “Duty-cycled Wireless Power Transmission for Millimeter-sized Biomedical Implants,” Electronics (MDPI), Vol. 9, No. 12, 2130, 2020.

[J16] Hongseok Shin, Jinuk Kim, Doojin Jang, Donghee Cho, Yoontae Jung, Hyungjoo Cho, Unbong Lee, Chul Kim, Sohmyung Ha, and Minkyu Je, “An Energy-Efficient Three-Stage Amplifier Achieving a High Unity-Gain Bandwidth for Large Capacitive Loads without Using a Compensation Zero,” IEEE Solid-State Circuits Letters (SSCL), Vol. 3, pp. 530-533, 2020.

[C21] Kyosung Choo, Aspen Glaspell, and Sohmyung Ha, “Thermal Simulation Model of Growing Cells Atop Microelectronic Chips,” Proceedings of the International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT), Niagara Falls, Canada, November 15-17, 2020.

[BC2] Sohmyung Ha, Chul Kim, Hui Wang, Yu M. Chi, Patrick P. Mercier, and Gert Cauwenberghs, “Low-Power Integrated Circuits for Wearable Electrophysiology,” Wearable Sensors: Fundamentals, Implementation and Applications, 2nd ed. (Edward Sazonov Ed.), Academic Press (Elsevier), November 2020.

[C20] Hongseok Shin, Jinuk Kim, Doojin Jang, Donghee Cho, Yoontae Jung, Hyungjoo Cho, Unbong Lee, Chul Kim, Sohmyung Ha, and Minkyu Je, “A 0.0046mm² 6.7μW Three-Stage Amplifier Capable of Driving 0.5-to-1.9nF Capacitive Load with >0.68MHz GBW without Compensation Zero,” Symposium on VLSI Circuits Digest of Technical Papers, Honolulu, HI, USA, June 14-19, 2020.

[C19] Rajkumar Kubendran, Jongkil Park, Ritvik Sharma, Chul Kim, Siddharth Joshi, Gert Cauwenberghs, and Sohmyung Ha, “A 4.2-pJ/conv 10-B Asynchronous ADC with Hybrid Two-Tier Level-Crossing Event Coding,” Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS), Seville, Spain, May 17-20, 2020.

[J13] Thaer Alafghani, Neeraj K. Mandloi, and Sohmyung Ha, “Adaptive-stage Rectifier for mm-scale Implants,” Electronics Letters, Vol. 56, No. 2, pp. 66-68, January 2020.

[J12] Mohammed F. Daqaq, Rafael S. Crespo, and Sohmyung Ha, “On the Efficacy of Charging a Battery Using a Chaotic Energy Harvester,” Nonlinear Dynamics, Vol. 99, pp. 1525–1537, 2020. 

————– 2019 ————– 

[B1] Sohmyung Ha, Chul Kim, Patrick Mercier, and Gert Cauwenberghs, “High-Density Integrated Electrocortical Neural Interfaces,” Academic Press (Elsevier), 2019

[J11] Chul Kim, Jiwoong Park, Sohmyung Ha, Abraham Akinin, Rajkumar Kubendran, Patrick P. Mercier, and Gert Cauwenberghs, “A 3 mm × 3 mm Fully Integrated Wireless Power Receiver and Neural Interface System-on-Chip,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol. 13, No. 6, pp. 1736 – 1746, December 2019.

[C18] Saqib Subhan, Sachin Khapli, Yong-Ak Song, and Sohmyung Ha, “A Fully Differential Potentiostat Circuit with Integrated Time-based ADCs,” Proceedings of IEEE Biomedical Circuits and Systems Conference (BioCAS), Nara, Japan, October 17-19, 2019.

[C17] Mallory S. E. Roberts, Francesco Arneodo, Adriano di Giovanni, Ahlam Al Qasim, Aisha Al Mannaei, Noora Almarri, Lolowa Alkindi, Fatema AlKhouri, Philip Panicker, Sohmyung Ha, Laura Manenti, Gianmarco Bruno, Rodrigo Torres, Valerio Conicella, Prashanth Marpu, Thu Vu, and Heyam Al Blooshi “RAAD: a CubeSat-based soft gamma-ray detector for the study of terrestrial gamma-ray flashes and other short timescale phenomena“, Proc. SPIE 11151, Sensors, Systems, and Next-Generation Satellites XXIII, 111510Y, October 10, 2019. 

[J10] Saqib Subhan and Sohmyung Ha, “A Harmonic Error Cancellation Method for Accurate Clock-based Electrochemical Impedance Spectroscopy,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol.13, No.4, August 2019.

[J9] Sohmyung Ha, Chul Kim, Jiwoong Park, Gert Cauwenberghs, and Patrick P. Mercier, “A Fully Integrated RF-powered Energy-replenishing Current-controlled Stimulator,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol.13, No.1, February 2019.

————– 2018 ————– 

[C16] Saqib Subhan and Sohmyung Ha, “Harmonic Error Cancellation for Accurate Square-Wave-Based Bio-Impedance Measurements,” Proceedings of the 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Honolulu, HI, USA, July 17-21, 2018.

[C15] Neeraj Mandloi and Sohmyung Ha, “Magnetically Balanced Power and Data Telemetry for mm-Scale Neural Implants,” Proceedings of the 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Honolulu, HI, USA, July 17-21, 2018.

[J8] Chul Kim, Chang-Seok Chae, Young-Sub Yuk,  Chris M. Thomas, Yi-Gyeong Kim, Jong-Kee Kwon, Sohmyung Ha, Gert Cauwenberghs, and Gyu-Hyeong Cho, “A 500 MHz Bandwidth 7.5 mVpp Ripple Power-Amplifier Supply Modulator for RF Polar Transmitters,” IEEE Journal of Solid-State Circuits (JSSC), Vol.53, No.6, June 2018.

————– 2017 ————– 

[J7] Chul Kim, Sohmyung Ha, Jiwoong Park, Abraham Akinin, Patrick P. Mercier, and Gert Cauwenberghs, “A 144 MHz Fully Integrated Resonant Regulating Rectifier with Hybrid Pulse Modulation for mm-sized Implants,” IEEE Journal of Solid-State Circuits (JSSC), Vol.52, No.11, November 2017.

[C14] Jiwoong Park, Chul Kim, Abraham Akinin, Sohmyung Ha, Gert Cauwenberghe, and Patrick Mercier, “Wireless Powering of mm-Scale Fully-on-Chip Neural Interfaces,” Proceedings of IEEE Biomedical Circuits and Systems Conference (BioCAS), Turin, Italy, October 19-21, 2017.

[C13] Chul Kim, Sohmyung Ha, Abraham Akinin, Jiwoong Park, Rajkumar Kubendran, Hui Wang, Patrick P. Mercier, and Gert Cauwenberghs, “Design of Miniaturized Wireless Power Receivers for mm-sized Implants,” Proceedings of IEEE Custom Integrated Circuits Conference (CICC), Austin, TX, USA, April 30 – May 3, 2017.

[C12] Siddharth Joshi, Chul Kim, Sohmyung Ha, Yu M. Chi, and Gert Cauwenberghs, “From algorithms to devices: Enabling machine learning through ultra-low-power VLSI mixed-signal array processing,” Proceedings of IEEE Custom Integrated Circuits Conference (CICC), Austin, TX, USA, April 30 – May 3, 2017.