公开(公告)号：US11031926B2

公开(公告)日：2021-06-08

申请号：US16975267

申请日：2019-10-21

Applicant: Beijing BOE Technology Development Co., Ltd. ,  BOE Technology Group Co., Ltd.

Inventor： Xiangye Wei ,  Liming Xiu ,  Yiming Bai ,  Xin Li

IPC: H03K5/00 ,  H03K3/037 ,  G06F1/10 ,  G06F1/08 ,  H03K19/20

Abstract: A digital clock circuit is provided. The digital clock circuit includes a first sub-circuit comprising a first digitally-controlled oscillator driven by a frequency control word to control a first output frequency synthesized from multiple first pulses, and a first frequency divider to generate a trigger signal having a frequency equal to 1/M of the first output frequency. The digital clock circuit also includes a second sub-circuit comprising a loop of feedback including a frequency detector to compare an input frequency with a feedback frequency, a controller to adjust the frequency control word, a second digitally-controlled oscillator driven by the frequency control word plus a constant to control a second output frequency synthesized from multiple second pulses induced by the trigger signal, and a second frequency divider to set the feedback frequency equal to 1/N of the second output frequency in the loop of feedback.