Main Research Areas

PVT Insensitive Low-Power Voltage/Current Reference Circuits

• PVT insensitive on-chip resistors for reference circuits

• Ultra-low-voltage, low-power CMOS voltage/current references

• Trim-free, low-power CMOS voltage/current references

• Fully differential voltage/current reference circuits

On-chip Clock Generators

• Low-power CMOS reference clock oscillators with high frequency stability

• Fully differential CMOS reference clock oscillators

• Low-noise relaxation oscillators

• Low-noise, high-frequency MEMS-based oscillators

• Wireless on-chip calibration techniques for high precision oscillators

Low-Cost, Low-Power Sensing Systems

• Ultra-low-power temperature sensors

• Supply-and temperature-insensitive capacitive sensor interfaces

• Digitally synthesizable temperature sensors

• PVT insensitive, high-performance interfaces for capacitive sensor arrays

Highly Energy Efficient Wireless Transceivers

• Wideband WBAN transceivers using the human body channel

• In-body channel communication technologies

Professional Experience

• Mar. 2026 ~ Present

Professor, EECS, DGIST

• Mar. 2021 ~ Feb. 2026

Associate Professor, EECS, DGIST

• Feb. 2016 ~ Feb. 2021

Assistant Professor, ICE, DGIST

• Nov. 2011 ~ Feb. 2016

Scientist, Institute of Microelectronics, A*STAR

• Leader of the research project developing an ASIC for 3D capacitive sensor arrays for circular tumor cell detection

• Leader of the industry project developing an ASIC for high-precision MEMS-based accelerometers and gyroscopes

• Leader of the research project developing highly energy-efficient wideband wireless transceivers for a body area network

• Leader of the industry project developing an ASIC for low-power and low-noise MEMS oscillators

• Participated in the research project, developing a wireless brain-recording system

• Ph.D. thesis advisor for a research project developing process, voltage, and temperature (PVT) insensitive capacitive and temperature sensors

• Jan. 2006 ~ Sep. 2011 (Daejeon, Korea)

Research Assistant, Communication Circuits and System Laboratory, KAIST

• Developed low-power CMOS reference clock oscillators for biomedical devices and various sensors

• Developed an ultra-low voltage and low-power voltage reference with a wide temperature range

• Developed a low-power current reference with process-insensitive temperature compensation

• Developed an all-digital frequency-locked loop for oscillators robust against process variation