TY - Chin. Phys. Lett. A1 - Zhao-Min Jia, Xu-Hai Yang, Bao-Qi Sun, Xiao-Ping Zhou, Bo Xiang, Xin-Yu Dou T1 - Direct Digital Frequency Control Based on the Phase Step Change Characteristic between Signals Y1 - 2017-08-08 JF - Chinese Physics Letters JO - Chin. Phys. Lett. SP - 090601EP - VL - 34 IS - 9 UR - https://cpl.iphy.ac.cn N1 - 10.1088/0256-307X/34/9/090601 ER -