公开(公告)号：US10897259B1

公开(公告)日：2021-01-19

申请号：US16853076

申请日：2020-04-20

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Shinwoong Kim ,  Myounggyun Kim ,  Chulho Kim ,  Inhyo Ryu ,  Jaewon Choi ,  Sangwook Han ,  Honggul Han

IPC分类号： H03L7/087 ,  H03L7/089 ,  H03L7/095 ,  H03L7/14 ,  H03L7/091 ,  H03L7/099 ,  H03L7/195 ,  H03L7/093

摘要： A phase locked circuit includes an oscillator configured to generate an output clock signal, a first phase detector configured to detect a phase difference between an input clock signal and a feedback clock signal based on the output clock signal, a second phase detector having a wider phase locking range than that of the first phase detector and configured to detect the phase difference between the input clock signal and the feedback clock signal, and a charge pump controller configured to control an output current of a charge pump included in the second phase detector based on the phase difference detected by the first phase detector. When the phase difference between the input clock signal and the feedback clock signal is within the phase locking range of the first phase detector, the oscillator and the first phase detector are connected to each other.