Publication

Conference

•  Jahyun Koo ; Theogarajan Luke, “A 10 MHz to 3.2 GHz Differential Current Starved Inverter-Based Self-Biased Adaptive Bandwidth PLL in 65nm CMOS,” IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), Aug, 2024  [Link]

• Andrew Netherton, Mario Dumont, Zachary Nelson, Jinesh Jhonsa, Alice Mo, Jahyun Koo, David McCarthy, Noah Pestana, Skylar Deckoff-Jones, Christopher Poulton, Michael Frankel, Jock Bovington, Luke Theogarajan, John Bowers, “Short-Reach Silicon Photonic Interconnects with Quantum Dot Mode Locked Laser Comb Sources,” IEEE International Solid-State Circuits Conference(ISSCC), Feb. 2024 [Link]

• Cheonhoo Jeon ; Jahyun Koo ; Kyongsu Lee ; Su-Kyoung Kim ; Sei Kwang Hahn ; Byungsub Kim ; Hong-June Park ; Jae-Yoon Sim, “A 143nW Glucose-Monitoring Smart Contact Lens IC with a Dual-Mode Transmitter for Wireless-Powered Backscattering and RF-Radiated Transmission Using a Single Loop Antenna,” Symposium on VLSI Circuits (VLSI), June 2019  [Link]

• Minseob Lee ; Shinwoong Kim ; Hwasuk Cho ; Jahyun Koo ; Kwang-Hee Choi ; Jin-Hyeok Choi ; Byungsub Kim ; Hong-June Park ; Jae-Yoon Sim, “A 0.3-to-1.2V frequency-scalable fractional-N ADPLL with a speculative dual-referenced interpolating TDC,” IEEE International Solid-State Circuits Conference (ISSCC), February 2018  [Link]

• Hyunwoo Son, Hwasuk Cho, Jahyun Koo, Youngwoo Ji, Byungsub Kim, Hong-June Park and Jae-Yoon Sim, “A low-power wide dynamic-range current readout circuit for biosensors,” Asia and South Pacific Design Automation Conference (ASP-DAC), January 2018  [Link]

• Jahyun Koo ; Kyoung-Sik Moon ; Byungsub Kim ; Hong-June Park ; Jae-Yoon Sim, “A quadrature relaxation oscillator with a process-induced frequency-error compensation loop,” IEEE International Solid-State Circuits Conference (ISSCC), February 2017   [Link]

Journal

•    Jahyun Koo*, Jae-Yoon Sim, Luke Theogarajan, “A Parasitic and Mismatch Tolerant Fully Common-Centroided and Shielded Split-CDAC With Identical Unit Capacitors for SAR-ADC,” IEEE Trans. On Very Large Scale Integration Systems (TVLSI), Early Access [Link]

•    Joon-Pyo Hong;Minseob Lee;Jahyun Koo;Jae-Yoon Sim, “A synthesizable quarter-rate CDR based on all digital fractional-N PLL with quadrature rotational frequency detector,” IEICE Electronics Express, vol 22, issue 17, 2025 [Link]

•    Jahyun Koo, Cheonhoo Jeon, Jae-Yoon Sim, “A Fully Differential Distributed RC Oscillator with a Suppression of Noise and Temperature Sensitivities,” IEEE Trans. Circuits Syst. II (TCAS-II), vol 72, no 11, 2025 [Link]

•    Jahyun Koo*, Hyunwoo Son*, Jae-Yoon Sim, “A 9.6-nW Wake-Up Timer With RC-Referenced Subharmonic Locking Using Dual Leakage-Based Oscillators,” IEEE Trans. On Very Large Scale Integration Systems (TVLSI), Vol. 33, 2025 [Link]

•    Cheonhoo Jeon, Jahyun Koo, “Wireless LED controller IC for smart contact lens system,” IET Electronics Letter, vol.60, no.19, Oct, 2024 [Link]

•    Jahyun Koo, Jae-Yoon Sim, “Low-Noise Distributed RC Oscillator,” IEEE Trans. On Very Large Scale Integration Systems (TVLSI), vol. 30, 2022 [Link]

•    Do Hee Keum*, Su-Kyoung Kim*, Jahyun Koo*, Geon-Hui Lee, Cheonhoo Jeon, Jee Won Mok, Beom Ho Mun, Keon Jae Lee, Ehsan Kamrani, Choun-Ki Joo, Sangbaie Shin, Jae-Yoon Sim, David Myung, Seok Hyun Yun, Zhenan Bao and Sei Kwang Hahn, “Wireless smart contact lens for diabetic diagnosis and therapy,” Science Advances, 2020 [Link]

* co-author

•    Jahyun Koo, Byungsub Kim, Hong-June Park, Jae-Yoon Sim, “A Quadrature RC Oscillator With Noise Reduction by Voltage Swing Control,” IEEE Trans. Circuits Syst. I (TCAS-I), vol. 66, 2019 [Link]

•    Cheonhoo Jeon, Jahyun Koo, Kyongsu Lee, Minseob Lee, Su-Kyoung Kim, Sangbaie Shin, Sei Kwang Hahn, Jae-Yoon Sim, “A Smart Contact Lens Controller IC Supporting Dual-Mode Telemetry With Wireless-Powered Backscattering LSK and EM-Radiated RF Transmission Using a Single-Loop Antenna,” IEEE J. Solid-State Circuits (JSSC), vol. 53, 2019 [Link]

•    Su-Kyoung Kim, Cheonhoo Jeon, Geon-Hui Lee, Jahyun Koo, Seong Hwi Cho, Seulgi Han, Myeong-Hwan Shin, Jae-Yoon Sim, Sei Kwang Hahn, “Hyaluronate–gold nanoparticle/glucose oxidase complex for highly sensitive wireless noninvasive glucose sensors,” ACS applied materials & interfaces, vol. 11, 2019 [Link]

•    Hyunwoo Son, Hwasuk Cho, Jahyun Koo, Youngwoo Ji, Byungsub Kim, Hong-June Park and Jae-Yoon Sim, “A Low-Power Wide Dynamic-Range Current Readout Circuit for Ion-Sensitive FET Sensors,” IEEE Trans. Biomed. Circuits Syst. (TBCAS), vol. 11, 2017 [Link]