An experimental coin-sized radio for extremely low-power WPAN (IEEE 802.15.4) application at 2.4 GHz. - Pilsoon Choi; Hyung Chul Park; Sohyeong Kim; Sungchung Park; Ilku Nam; Tae Wook Kim; Seokjong Park; Sangho Shin; Myeung Su Kim; Kyucheol Kang; Yeonwoo Ku; Hyokjae Choi; et al. (IEEE J. Solid State Circuits, 2003)