A 5.5mA 2.4-GHz two-point modulation Zigbee transmitter with modulation gain calibration. - Rui Yu; Theng-Tee Yeo; Kwang-Hung Tan; Shouxian Mou; Yike Cui; Haifeng Wang; Hwa-Seng Yap; Eugene Ting; Masaaki Itoh (CICC, 2009)