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Research output

Publications

2026

  1. Major Conference A-SSCC Energy-Efficient Sensor Interfaces

    A 0.04 mm² BJT-Based Capacitively-Biased Diode Temperature Sensor with Filter-Assisted Active Noise Cancellation

    Y. Cho , J. Won , K. Kang , B. Son , S. Chon , Y. Chae , W. Choi

    IEEE Asian Solid-State Circuits Conference (A-SSCC), Nov. 2026

    Woojun Choi, Ph.D. Woojun Choi
  2. Major Conference A-SSCC Energy-Efficient Sensor Interfaces Data Converters and In-Memory Computing

    A 200-fps SPAD dToF LiDAR Sensor with In-Pixel Phase-Domain ΔΣ TDC and Dual-GRO Extended Counting

    Y. Na , T. Jeon , M.-J. Lee , M.-J. Lee , Y. Chae , W. Choi

    IEEE Asian Solid-State Circuits Conference (A-SSCC), Nov. 2026

    Woojun Choi, Ph.D. Woojun Choi
  3. Top-tier Conference VLSI Biomedical Circuits and Systems

    A 256-Channel, 32-Interconnect, 1.25-NEF, In Vitro and In Vivo Neural Interface with Auto-Calibrated Input Impedance Boosting and On-Chip Spike Detection for Flexible Capacitive Microelectrode Array

    Y. Chen * , S. Nam * , S. Byun * , P. Velcich , S. Cho , C. Lee , J. Lee , S. Weaver , E. Brugnolotto , E. Hwang , D. Seo , E. Lee , K. Yu , W. Choi , T. Jang

    * Equal contribution authorship

    IEEE Symposium on VLSI Technology and Circuits (VLSI), June 2026

    Suhyeon Nam Suhyeon Nam Sun-Woong Byun Sun-Woong Byun Woojun Choi, Ph.D. Woojun Choi
  4. Major Conference CICC Data Converters and In-Memory Computing

    A 1.92µm-Pitch Current-Controlled Oscillator ADC Array Featuring Charge-Injection-Based Two-Stage Conversion for In-Memory Computing

    D. Iselin , K. Jeong , T. Keller , G. Cristiano , K. Kim , W. Choi , O. Toomey , A. Singh , A. Vasilopoulos , A. Sebastian , M. Gallo , T. Jang

    IEEE Custom Integrated Circuits Conference (CICC), April 2026

    Woojun Choi, Ph.D. Woojun Choi

2025

  1. Journal OJ-SSCS Energy-Efficient Sensor Interfaces

    Recent Advances in Energy-Efficient and Temperature-Resilient Sensor Interfaces

    W. Choi , I. Lee , Y. Ji , A. Delke , S. Pan , Z. Tang , Y. Chae

    IEEE Open Journal of the Solid-State Circuits Society, vol. 5, pp. 456–469, Nov. 2025

    Woojun Choi, Ph.D. Woojun Choi

2024

  1. Journal bioRxiv Biomedical Circuits and Systems

    Code Multiplexed Nanocapacitor Arrays for Scalable Neural Recordings

    S. Weaver , Y. Chen , A. Renz , W. Choi , Y. Vyza , T. Schlotter , K. Vulić , D. Kim , G. Atzeni , D. Momotenko , N. Nakatsuka , T. Jang , J. Vörös

    bioRxiv, Feb. 2024

    Woojun Choi, Ph.D. Woojun Choi
  2. Conference ICEIC Voltage and Frequency References

    A Review on Integrated RC Frequency References for IoT Applications

    W. Choi

    IEEE International Conference on Electronics, Information, and Communication (ICEIC), Jan. 2024

    Woojun Choi, Ph.D. Woojun Choi

2023

  1. Book Chapter Springer Voltage and Frequency References

    RC Frequency References Based on Dual-RC FLLs

    Y. Chae , W. Choi

    Biomedical Electronics, Noise Shaping ADCs, and Frequency References, Springer, Aug. 2023

    Woojun Choi, Ph.D. Woojun Choi
  2. Top-tier Conference VLSI Biomedical Circuits and Systems

    A 1,024-Channel, 64-Interconnect, Capacitive Neural Interface Using a Cross-Coupled Microelectrode Array and 2-Dimensional Code-Division Multiplexing

    W. Choi * , Y. Chen * , D. Kim * , S. Weaver , T. Schlotter , C. Livanelioglu , J. Liao , R. Incandela , P. Davami , G. Atzeni , S. Arjmandpour , S.-H. Cho , T. Jang

    * Co-first authorship

    IEEE Symposium on VLSI Technology and Circuits (VLSI), June 2023

    Woojun Choi, Ph.D. Woojun Choi
  3. Top-tier Conference VLSI Energy-Efficient Sensor Interfaces

    A Highly-Digital PWM-Based Impedance Monitoring IC with 143.2dB DR and 17.7fFᵣₘₛ Resolution

    H. Han , W. Choi , J. Kim , J. Sung , H.-J. Choi , Y. Chae

    IEEE Symposium on VLSI Technology and Circuits (VLSI), June 2023

    Woojun Choi, Ph.D. Woojun Choi
  4. Major Journal L-SSC Biomedical Circuits and Systems

    A Compact and PVT-Robust Segmented Duty-Cycled Resistor Realizing TΩ Impedances for Neural Recording Interface Circuits

    C. Livanelioglu * , W. Choi * , D. Kim , J. Liao , R. Incandela , T. Jang

    * Co-first authorship

    IEEE Solid-State Circuits Letters, vol. 6, pp. 25–28, Jan. 2023

    Woojun Choi, Ph.D. Woojun Choi

2022

  1. Top-tier Journal JSSC Biomedical Circuits and Systems Miniaturized Sensor Platforms

    A Miniaturized Wireless Neural Implant with Body-Coupled Power Delivery and Data Transmission

    C. Lee , B. Kim , J. Kim , T. Jeon , W. Choi , S. Yang , J.-H. Ahn , J. Bae , Y. Chae

    IEEE Journal of Solid-State Circuits, vol. 57, no. 11, pp. 3212–3227, Nov. 2022

    Woojun Choi, Ph.D. Woojun Choi
  2. Top-tier Journal JSSC Voltage and Frequency References Miniaturized Sensor Platforms

    A 0.9 V 28 MHz Highly Digital CMOS Dual-RC Frequency Reference with ±200 ppm Inaccuracy from −40 °C to 85 °C

    W. Choi , J. Angevare , I. Park , K. A. A. Makinwa , Y. Chae

    IEEE Journal of Solid-State Circuits, vol. 57, no. 8, pp. 2418–2428, Aug. 2022

    Woojun Choi, Ph.D. Woojun Choi
  3. Top-tier Conference VLSI Biomedical Circuits and Systems

    A 0.0014 mm², 1.18 TΩ Segmented Duty-Cycled Resistor Replacing Pseudo-Resistor for Neural Recording Interface Circuits

    C. Livanelioglu * , W. Choi * , D. Kim , J. Liao , R. Incandela , G. Cristiano , T. Jang

    * Co-first authorship

    IEEE Symposium on VLSI Technology and Circuits, pp. 62–63, June 2022

    Woojun Choi, Ph.D. Woojun Choi
  4. Top-tier Conference ISSCC Biomedical Circuits and Systems Miniaturized Sensor Platforms

    A Miniaturized Wireless Neural Implant with Body-Coupled Data Transmission and Power Delivery for Freely Behaving Animals

    C. Lee , B. Kim , J. Kim , T. Jeon , W. Choi , S. Yang , J.-H. Ahn , J. Bae , Y. Chae

    IEEE International Solid-State Circuits Conference, pp. 340–341, Feb. 2022

    Woojun Choi, Ph.D. Woojun Choi

2021

  1. Top-tier Journal JSSC Energy-Efficient Sensor Interfaces

    A 64 × 64 SPAD-Based Indirect Time-of-Flight Image Sensor with 2-Tap Analog Pulse Counters

    B. Park , I. Park , C. Park , W. Choi , Y. Na , M.-J. Lee , Y. Chae

    IEEE Journal of Solid-State Circuits, vol. 56, no. 10, pp. 2956–2967, Oct. 2021

    Woojun Choi, Ph.D. Woojun Choi
  2. Top-tier Conference ISSCC Voltage and Frequency References Miniaturized Sensor Platforms

    A 0.9 V 28 MHz Dual-RC Frequency Reference with 5 pJ/Cycle and ±200 ppm Inaccuracy from −40 °C to 85 °C

    W. Choi , J. Angevare , I. Park , K. A. A. Makinwa , Y. Chae

    IEEE International Solid-State Circuits Conference, pp. 434–435, Feb. 2021 · Takuo Sugano Award for Outstanding Far-East Paper

    Woojun Choi, Ph.D. Woojun Choi

2020

  1. Major Journal L-SSC Energy-Efficient Sensor Interfaces

    A 40 m-Range 90 fps CMOS Time-of-Flight Sensor Using SPAD and In-Pixel Time-Gated Pulse Counter

    B. Park , I. Park , W. Choi , Y. Na , Y. Chae

    IEEE Solid-State Circuits Letters, vol. 3, no. 11, pp. 422–425, Nov. 2020

    Woojun Choi, Ph.D. Woojun Choi
  2. Major Conference CICC Energy-Efficient Sensor Interfaces

    A DTMOST-Based Temperature Sensor with 3σ Inaccuracy of ±0.9 °C for Self-Refresh Control in 28 nm Mobile DRAM

    S. Park , Y. Kim , W. Choi , Y. Lee , S. Kim , Y. Shin , Y. Chae

    IEEE Custom Integrated Circuits Conference, Mar. 2020

    Woojun Choi, Ph.D. Woojun Choi

2019

  1. Major Journal L-SSC Energy-Efficient Sensor Interfaces

    A 5800 µm² Resistor-Based Temperature Sensor with a One-Point Trimmed Inaccuracy of ±1.2 °C (3σ) from −50 °C to 105 °C in 65-nm CMOS

    Y. Lee , W. Choi , T. Kim , S. Song , K. A. A. Makinwa , Y. Chae

    IEEE Solid-State Circuits Letters, vol. 2, no. 9, pp. 67–70, Sep. 2019

    Woojun Choi, Ph.D. Woojun Choi
  2. Top-tier Conference VLSI Energy-Efficient Sensor Interfaces

    A 0.02 mm² 100 dB-DR Impedance Monitoring IC with PWM-Dual GRO Architecture

    H. Han , W. Choi , Y. Chae

    IEEE Symposium on VLSI Technology and Circuits, pp. C60–C61, June 2019

    Woojun Choi, Ph.D. Woojun Choi
  3. Top-tier Conference VLSI Energy-Efficient Sensor Interfaces

    A 64 × 64 APD-Based ToF Image Sensor with Background Light Suppression up to 200 klx Using In-Pixel Auto-Zeroing and Chopping

    B. Park , I. Park , W. Choi , Y. Chae

    IEEE Symposium on VLSI Technology and Circuits, pp. C256–C257, June 2019

    Woojun Choi, Ph.D. Woojun Choi

2018

  1. Top-tier Journal JSSC Energy-Efficient Sensor Interfaces

    A Compact Resistor-Based CMOS Temperature Sensor with an Inaccuracy of 0.12 °C (3σ) and a Resolution FoM of 0.43 pJ·K² in 65-nm CMOS

    W. Choi , Y. Lee , S. Kim , S. Lee , J. Jang , J. Chun , K. A. A. Makinwa , Y. Chae

    IEEE Journal of Solid-State Circuits, vol. 53, no. 12, pp. 3356–3367, Dec. 2018

    Woojun Choi, Ph.D. Woojun Choi
  2. Top-tier Conference ISSCC Energy-Efficient Sensor Interfaces

    A 0.53 pJ·K² 7000 µm² Resistor-Based Temperature Sensor with an Inaccuracy of ±0.35 °C (3σ) in 65 nm CMOS

    W. Choi , Y. Lee , S. Kim , S. Lee , J. Jang , J. Chun , K. A. A. Makinwa , Y. Chae

    IEEE International Solid-State Circuits Conference, pp. 322–323, Feb. 2018

    Woojun Choi, Ph.D. Woojun Choi

2017

  1. Top-tier Conference ISSCC Miniaturized Sensor Platforms

    A 1 V 7.8 mW 15.6 Gb/s C-PHY Transceiver Using Tri-Level Signaling for Post-LPDDR4

    W. Choi , T. Kim , J. Shim , H. Kim , G. Han , Y. Chae

    IEEE International Solid-State Circuits Conference, pp. 402–403, Feb. 2017

    Woojun Choi, Ph.D. Woojun Choi

2015

  1. Major Conference ESSCIRC Energy-Efficient Sensor Interfaces

    A 0.02 mm² Embedded Temperature Sensor with ±2 °C Inaccuracy for Self-Refresh Control in 25 nm Mobile DRAM

    Y. Kim , W. Choi , J. Kim , S. Lee , S. Lee , H. Kim , K. A. A. Makinwa , Y. Chae , T. Kim

    IEEE European Solid-State Circuits Conference, pp. 267–270, Sep. 2015

    Woojun Choi, Ph.D. Woojun Choi