Wei-Ting Lin, Zong-Yi Lin, Chia-Hao Liu, Ke-Horng Chen, Ying-Hsi Lin, Jian-Ru Lin, Tsung-Yen Tsai: A 20MHz Low Dropout Controlled Current Sensor for Constant On-Time Based Envelop Tacking Supply Modulator for Radio Frequency Power Amplifier. ISCAS 2018: 1-4