公开(公告)号：US20240106497A1

公开(公告)日：2024-03-28

申请号：US18534194

申请日：2023-12-08

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Rui YU ,  Xuesong CHEN ,  Supeng LIU ,  Lei WANG ,  Zhan YU ,  Theng Tee YEO

IPC: H04B5/72 ,  H03L7/099 ,  H04B5/48

CPC classification number: H04B5/72 ,  H03L7/099 ,  H04B5/48

Abstract: The present disclosure relates to the field of communication technologies, and provide a near-field communication (NFC) chip, a phase synchronization method, and an electronic device, to quickly synchronize a transmitted signal of an NFC card device with a carrier of an NFC card reader. The NFC chip includes a processing circuit configured to: determine a first carrier frequency offset between a local clock signal and a carrier clock signal, and generate a first frequency control word based on the first carrier frequency offset. The carrier clock signal is determined based on a received signal received by the NFC chip. The NFC chip further includes a phase-locked loop configured to generate a first clock signal based on the local clock signal and the first frequency control word. The NFC chip also includes a phase alignment circuit configured to perform phase selection on the first clock signal based on the carrier clock signal to obtain a second clock signal, and send the second clock signal to a transmitter circuit.