Digital-domain calibration of split-capacitor DAC with no extra calibration DAC for a differential-type SAR ADC. - Ji-Yong Um; Jae-Hwan Kim; Jae-Yoon Sim; Hong-June Park (A-SSCC, 2011)

Time-interleaved sample clock generator for ultrasound beamformer application. - Jae-Hwan Kim; Ji-Yong Um; Jae-Yoon Sim; Hong-June Park (ISOCC, 2011)

A Digital-Domain Calibration of Split-Capacitor DAC for a Differential SAR ADC Without Additional Analog Circuits. - Ji-Yong Um; Yoon-Jee Kim; Eun-Woo Song; Jae-Yoon Sim; Hong-June Park (IEEE Trans. Circuits Syst. I Regul. Pap., 2013)

24.8 An analog-digital-hybrid single-chip RX beamformer with non-uniform sampling for 2D-CMUT ultrasound imaging to achieve wide dynamic range of delay and small chip area. - Ji-Yong Um; Eun-Woo Song; Yoon-Jee Kim; Seong-Eun Cho; Min-Kyun Chae; Jongkeun Song; Bae-Hyung Kim; Seunghun Lee; Jihoon Bang; Youngil Kim; Kyungil Cho; Byungsub Kim; et al. (ISSCC, 2014)

An Analog-Digital Hybrid RX Beamformer Chip With Non-Uniform Sampling for Ultrasound Medical Imaging With 2D CMUT Array. - Ji-Yong Um; Yoon-Jee Kim; Seong-Eun Cho; Min-Kyun Chae; Jongkeun Song; Bae-Hyung Kim; Seung-Hun Lee; Jihoon Bang; Youngil Kim; Kyungil Cho; Byungsub Kim; Jae-Yoon Sim; et al. (IEEE Trans. Biomed. Circuits Syst., 2014)

Power noise rejection and device noise analysis at the reference level of ramp ADC. - Peter Ahn; Ji-Yong Um; Eunjung Choi; Hyunmook Park; Jaseung Gou; Kwangjun Cho; Kangbong Seo; Sangdong Yoo (IMSE, 2015)

A Single-Chip 32-Channel Analog Beamformer With 4-ns Delay Resolution and 768-ns Maximum Delay Range for Ultrasound Medical Imaging With a Linear Array Transducer. - Ji-Yong Um; Yoon-Jee Kim; Seong-Eun Cho; Min-Kyun Chae; Byungsub Kim; Jae-Yoon Sim; Hong-June Park (IEEE Trans. Biomed. Circuits Syst., 2015)

A Single-Chip 64-Channel Ultrasound RX-Beamformer Including Analog Front-End and an LUT for Non-Uniform ADC-Sample-Clock Generation. - Yoon-Jee Kim; Sung-Eun Cho; Ji-Yong Um; Min-Kyun Chae; Jihoon Bang; Jongkeun Song; Taeho Jeon; Byungsub Kim; Jae-Yoon Sim; Hong-June Park (IEEE Trans. Biomed. Circuits Syst., 2017)

A Programmable Gain Amplifier with Fast Transient Response for Medical Ultrasound System. - Min-Hyeong Son; Young-Chan Lee; Hyun-Min Baek; Hyo-Jeong Choi; Ji-Yong Um (ISOCC, 2022)

A Compact Variable Gain Amplifier With Continuous Time-Gain Compensation Using Systematic Predistorted Gain Control. - Ji-Yong Um (IEEE Trans. Circuits Syst. II Express Briefs, 2022)

Design and implementation of autonomous collaboration service between IoT using distributed platform. - Chang-Su Lee; Ji-Yong Um; Mi-Hyang Jeon (ICUFN, 2023)

Center Frequency Tracking Scheme to Optimize Pulse-Echo Response of Ultrasonic A-mode Scanner Circuit System. - Doo-Hyeon Ko; Young-Chan Lee; Ji-Yong Um (IEEE Access, 2023)

Arterial Distension Monitoring Scheme Using FPGA-Based Inference Machine in Ultrasound Scanner Circuit System. - Young-Chan Lee; Doo-Hyeon Ko; Min-Hyeong Son; Se-Hwan Yang; Ji-Yong Um (IEEE Trans. Biomed. Circuits Syst., 2024)

Design and HDL Implementation of Pulse-Arrival-Time Estimation Using XGBoost Regression With Tree-Recycling Architecture. - Hyo-Jeong Choi; Ji-Yong Um (IEEE Access, 2025)