Current-sensing technique for current-mode DC-DC buck converter with offset-voltage compensation. - Jungeui Park; Jungsoo Choi; Wooju Jeong; Sangduk Yu; Kichang Jang; Youngchan Choi; Joongho Choi (APCCAS, 2008)

A piezoelectric actuator driver circuit for automatic focusing of mobile phone cameras. - Sangduk Yu; Kichang Jang; Sanghyun Cha; Yeonjung Lee; Ohjo Kwon; Kyoungsoo Kwon; Joongho Choi (ISCAS, 2008)

A voltage-mode DC-DC converter with enhanced transient responses. - Kichang Jang; Jungsoo Choi; Chulkyu Park; Joongho Choi (ISCAS, 2012)

Radio-frequency energy-harvesting IC with DC-DC converter. - Donghoon Seong; Kichang Jang; Wonjoon Hwang; Hyeondeok Jeon; Joongho Choi (ISOCC, 2016)

13.1 A 1Tb 4b/cell NAND Flash Memory with tPROG=2ms, tR=110µs and 1.2Gb/s High-Speed IO Rate. - Doo-Hyun Kim; Hyunggon Kim; Sung-Won Yun; Youngsun Song; Jisu Kim; Sung-Min Joe; Kyung-Hwa Kang; Joonsuc Jang; Hyun-Jun Yoon; Kangbin Lee; Minseok Kim; Joonsoo Kwon; et al. (ISSCC, 2020)