A complementary Colpitts oscillator based on 0.35 μm CMOS technology. - Choong-Yul Cha; Sang-Gug Lee 001 (ESSCIRC, 2003)

A 5.2-GHz LNA in 0.35-μm CMOS utilizing inter-stage series resonance and optimizing the substrate resistance. - Choong-Yul Cha; Sang-Gug Lee 001 (IEEE J. Solid State Circuits, 2003)

Radio specifications of double conversion tuner for cable modem. - Choong-Yul Cha; Jeongki Choi; Hyo-Seok Kwon; Sang-Gug Lee 001 (IEEE Trans. Consumer Electron., 2003)

A very low-power quadrature VCO with back-gate coupling. - Hye-Ryoung Kim; Choong-Yul Cha; Seung-Min Oh; Moon-Su Yang; Sang-Gug Lee 001 (IEEE J. Solid State Circuits, 2004)

A Fast Hopping Frequency Synthesizer for UWB Systems in a CMOS Technology. - Hyunsu Chae; Eun-Chul Park; Choong-Yul Cha; Jungeun Lee; Chun-Deok Suh; Jeongwook Koh; Hanseung Lee; Hoon-Tae Kim (ISWCS, 2005)

Compact, High Impedance and Wide Bandwidth Detectors for Characterization of Millimeter Wave Performance. - Chikuang Yu; Chieh-Lin Wu; Sandeep Kshattry; Yang-Hun Yun; Choong-Yul Cha; Hisashi Shichijo; Kenneth K. O (IEEE J. Solid State Circuits, 2012)