Current Research

• High-speed/bandwidth interfaces (CICC25, ISSCC25_a, ISSCC25_b, arXiv24, VLSI22)

• Low-power/noise clocking (ESSERC24, arXiv24, ESSCIRC23, TCAS-II23, JSSC22)

• Privacy-preserving computing (PPAI25, ICCAD24, arXiv22, HPCA21, ISCA18)

• ML for systems/circuits (DATE25, arXiv23, TCAS-II23)

• Systems/circuits for ML (AICAS22, ISCAS22)

For a complete list of publications, see Google Scholar.

2025

• A 3ns idle-exit latency 0.28-28Gb/s/pin single-ended NRZ die-to-die interface with energy-efficient receiver and background noise compensation; Hyun-Seok Choi, Sunki Cho, Sanghee Lee, Hyeri Roh, Jeong-Eun Song, Honggyoo Ahn, Jihee Kim, Minchang Kim, Hankyu Chi, Deog-Kyoon Jeong, Woo-Seok Choi; CICC

• ML-based fast and accurate performance modeling and prediction for high-speed memory interfaces across different technologies; Taehoon Kim, Minjeong Kim, Hankyu Chi, Byungjun Kang, Eunji Song, Woo-Seok Choi; DATE

• Flash: A hybrid private inference protocol for deep CNNs with high accuracy and low latency on CPU; Hyeri Roh, Jinsu Yeo, Yeongil Ko, Gu-Yeon Wei, David Brooks, Woo-Seok Choi; PPAI (Extended version in arXiv)

• A 42Gb/s single-ended hybrid-DFE PAM-3 receiver for GDDR7 memory interfaces; Boram Kim, Hankyu Chi, Hyeongjun Ko, Sangyeon Byeon, Sungkwon Lee, Changhyun Pyo, Seulgi Kim, Byungjun Kang, Eunji Song, Kwangjin Na, Jinyoup Cha, Hyesoo Kim, Shinyoung Park, Woo-Seok Choi, Kyunghoon Kim, Hae-Kang Jung, Joohwan Cho, Jonghwan Kim; ISSCC

• A 0.275pJ/b 42Gb/s/pin clock-referenced PAM3 transceiver tolerant to supply noise, reference offset, and crosstalk for chiplets and short-reach memory interfaces; Kahyun Kim, Jung-Hun Park, Ha-Jung Park, Jia Park, Jihee Kim, Woo-Seok Choi; ISSCC

2024

• Hyena: Optimizing homomorphically encrypted convolution for private CNN inference; Hyeri Roh, Woo-Seok Choi; ICCAD

• An 8GHz 9bit phase-rotating ILCM with DTC range reduction for high-speed serial links; Jia Park, Jihee Kim, Sanghee Lee, Kahyun Kim, Ha-Jung Park, Woo-Seok Choi; ESSERC

• A 20-Gb/s 4-tap time-domain DFE with pulse width modulation for a DQ-DQS matched parallel receiver; Daehoon Na, Woo-Seok Choi, Seon-Kyoo Lee; EL

• A 4x32Gb/s 1.8pJ/bit collaborative baud-rate CDR with background eye-climbing algorithm and low-power global clock distribution; Jihee Kim, Jia Park, Jiwon Shin, Hanseok Kim, Kahyun Kim, Haengbeom Shin, Ha-Jung Park, Woo-Seok Choi; arXiv

• A 0.65-pJ/bit 3.6-TB/s/mm I/O interface with XTalk minimizing affine signaling for next-generation HBM with high interconnect density; Hyunjun Park, Jiwon Shin, Hanseok Kim, Jihee Kim, Haengbeom Shin, Taehoon Kim, Jung-Hun Park, Woo-Seok Choi; arXiv

2023

• NeuralEQ: Neural-network-based equalizer for high-speed wireline communication; Hanseok Kim, Jae Hyung Ju, Hyun Seok Choi, Hyeri Roh, Woo-Seok Choi; arXiv

• A PAM4 level mismatch adjustment scheme for 48-Gb/s PAM4 memory tester bridge; Daeho Yun, Minsu Park, Kahyun Kim, Kyungmin Baek, Eonhui Lee, Woo-Seok Choi, Deog-Kyoon Jeong; A-SSCC

• A 0.99-pJ/b 10-Gb/s receiver with fast recovery from sleep mode under voltage drift; Kwang-Hoon Lee, Jung-Hun Park, Yongjae Lee, Yeonggeun Song, Seungha Roh, Minkyo Shim, Yoonho Song, Woosong Jung, Young-Ha Hwang, Jonghyun Oh, Woo-Seok Choi, Deog-Kyoon Jeong; TCAS-II

• A near-threshold ring-oscillator-based ILCM with edge-selective error detector achieving -64dBc reference-spur and -239dB FOM; Jiwon Shin, Joonghyun Song, Jihee Kim, Woo-Seok Choi; ESSCIRC

• A context-aware readout system for sparse touch sensing array using ultra-low-power always-on event detection; Hyeri Roh, Woo-Seok Choi; TCAS-II

• Phase noise analysis for stochastically injected oscillators; Jiwon Shin, Woo-Seok Choi; TCAS-II

• A 48-Gb/s single-ended PAM-4 receiver with adaptive nonlinearity compensation; Kahyun Kim, Daeho Yun, Kyungmin Baek, Woo-Seok Choi, Deog-Kyoon Jeong; ISCAS

• Fast performance evaluation methodology for high-speed memory interfaces; Taehoon Kim, Yoona Lee, Woo-Seok Choi; DATE

2022

• Performance variability modeling of analog circuits using improved orthogonal matching pursuit; Hyun Jun Park, Woo-Seok Choi; ISOCC - Best Paper Award

• Impala: Low-latency communication-efficient private deep learning inference; Woo-Seok Choi, Brandon Reagen, Gu-Yeon Wei, David Brooks; arXiv

• A 32-Gb/s PAM4-binary bridge with sampler offset cancellation for memory testing; Daeho Yun, Eonhui Lee, Woosong Jung, Kahyun Kim, Kyungmin Baek, Jihee Kim, Hyunbae Lee, Byungsun Ko, Woo-Seok Choi, Deog-Kyoon Jeong; TCAS-II

• A residue-current-locked hybrid low-dropout regulator supporting ultralow dropout of sub-50mV with fast settling time below 10ns; Young-Ha Hwang, Jonghyun Oh, Woo-Seok Choi, Deog-Kyoon Jeong, Jun-Eun Park; JSSC

• 0.41-pJ/b/dB asymmetric simultaneous bidirectional transceivers with PAM-4 forward and PAM-2 back channels for 5-m automotive camera link; Yunhee Lee, Woonghee Lee, Minkyo Shim, Soyeong Shin, Woo-Seok Choi, Deog-Kyoon Jeong; VLSI

• Energy-efficient high-accuracy spiking neural network inference using time-domain neurons; Joonghyun Song, Jiwon Shin, Hanseok Kim, Woo-Seok Choi; AICAS - Best Paper Award

• A low-jitter 8-GHz RO-based ADPLL with PVT-robust replica-based analog closed loop for supply noise compensation; Hyojun Kim, Woosong Jung, Kwandong Kim, Sungwoo Kim, Woo-Seok Choi, Deog-Kyoon Jeong; JSSC

• A 2.5 - 32 Gb/s Gen 5-PCIe receiver with multi-rate CDR engine and hybrid DFE; Moon-Chul Choi, Sanghee Lee, Seungha Roh, Kwangho Lee, Jonghyun Oh, Sungwoo Kim, Kwandong Kim, Woo-Seok Choi, Jaeha Kim, Deog-Kyoon Jeong; TCAS-II

• Improving spiking neural network accuracy using time-based neurons; Hanseok Kim, Woo-Seok Choi; ISCAS

• Area and power efficient 10B6Q PAM-4 DC balance coder for automotive camera link; Woonghee Lee, Minkyo Shim, Yunhee Lee, Heejin Yang, Soyeong Shin, Woo-Seok Choi, Deog-Kyoon Jeong; TCAS-II

2021

• 0.37-pJ/bit/dB PAM-4 transmitter and adaptive receiver with fixed data and threshold levels for 12-m automotive camera link; Woonghee Lee, Minkyo Shim, Yunhee Lee, Heejin Yang, Han-Gon Ko, Woo-Seok Choi, Deog-Kyoon Jeong; ESSCIRC

• Cheetah: Optimizing and accelerating homomorphic encryption for private inference; Brandon Reagen*, Woo-Seok Choi*, Yeongil Ko, Vincent T. Lee, Hsien-Hsin S. Lee, Gu-Yeon Wei, David Brooks; HPCA - IEEE Micro Top Picks Honorable Mention

2020

• A 12-Gb/s 10-ns turn-on time rapid on/off baud-rate DFE receiver in 65nm CMOS; Dongwook Kim, Mostafa Ahmed, Woo-Seok Choi, Ahmed Elkholy, Pavan Kumar Hanumolu; JSSC

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