公开(公告)号：US20240195454A1

公开(公告)日：2024-06-13

申请号：US18418693

申请日：2024-01-22

Applicant: Huawei Technologies Co., Ltd.

Inventor： Rui Yu ,  Xuesong Chen ,  Supeng Liu ,  Lei Wang ,  Zhan Yu ,  Thengtee Yeo

IPC: H04B5/20

CPC classification number: H04B5/20

Abstract: A near-field communication (NFC) apparatus includes a clock extractor configured to perform clock recovery based on a first carrier signal sent by an NFC card reader to obtain a field clock signal; a digital phase-locked loop configured to perform frequency tracking on the field clock signal to output a first clock signal; a digital baseband chip configured to perform load modulation based on the first clock signal to generate a second carrier signal; and a controller configured to detect a frequency or a phase of the field clock signal, and selectively perform open-loop control on the digital phase-locked loop based on a detection result.