公开(公告)号：US10608649B1

公开(公告)日：2020-03-31

申请号：US16194678

申请日：2018-11-19

Applicant: Silicon Laboratories Inc.

Inventor： Kannanthodath V. Jayakumar ,  James David Barnette

IPC: H03L7/087 ,  H03L7/18 ,  H03L7/093 ,  H03L7/089

Abstract: An apparatus for providing a clock signal based on a received clock signal includes a time-to-digital converter configured to generate timestamp information based on the received clock signal. The apparatus includes a first filter configured to generate clock period information based on the timestamp information. The apparatus includes a phase monitor circuit. The phase monitor circuit includes a second filter configured to provide a mean period signal of the received clock signal based on the clock period information. The phase monitor includes a phase error detection circuit configured to generate a phase error indicator based on a threshold difference value and a difference between the clock period information and expected clock period information. The expected clock period information is based on the mean period signal.