公开(公告)号：US20230291538A1

公开(公告)日：2023-09-14

申请号：US18174183

申请日：2023-02-24

Applicant: STMicroelectronics S.r.I.

Inventor： Riccardo Condorelli ,  Antonino Mondello ,  Michele Alessandro Carrano

IPC: H04L7/033 ,  H03K5/26

CPC classification number: H04L7/033 ,  H03K5/26

Abstract: A method includes providing a reference clock signal having a reference period, providing a sampling clock signal having a sampling clock period shorter than the reference period of the reference clock signal, measuring the first subperiod as a first ratio of the first subperiod to the period of the sampling clock signal, measuring the second subperiod as a second ratio of the second subperiod to the period of the sampling clock signal, detecting a starting edge of a clock signal having a clock period greater than the reference period, producing a reconstructed reference signal based on the first ratio, the second ratio, and the detected starting edge, comparing the clock period of the clock signal with a period of the reconstructed reference signal to obtain a differential signal indicating a difference therebetween, and providing the differential signal to user circuitry for calibrating the clock signal.