Title:
NEAR-FIELD COMMUNICATION (NFC) DEVICE AND OPEN-LOOP CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2023/000345
Kind Code:
A1
Abstract:
The present application discloses a near-field communication (NFC) device and an open-loop control method, for use in preventing a digital phase-locked loop from executing a phase tracking operation according to a discontinuous first carrier signal. Provided is an NFC apparatus, comprising: a clock extractor for performing clock recovery according to a first carrier signal sent by an NFC card reader to obtain a field clock signal; a digital phase-locked loop for performing frequency tracking on the field clock signal to obtain a first clock signal; a digital baseband chip for performing load modulation according to the first clock signal to generate a second carrier signal; and a controller for detecting the frequency or phase of the field clock signal, and selectively controlling, according to the detection result, the digital phase-locked loop to perform open loop.
Inventors:
YU RUI (CN)
CHEN XUESONG (CN)
LIU SUPENG (CN)
WANG LEI (CN)
YU ZHAN (CN)
YEO THENGTEE (CN)
CHEN XUESONG (CN)
LIU SUPENG (CN)
WANG LEI (CN)
YU ZHAN (CN)
YEO THENGTEE (CN)
Application Number:
PCT/CN2021/108291
Publication Date:
January 26, 2023
Filing Date:
July 23, 2021
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04L7/033; H04B5/00; H04L7/00
Foreign References:
| US10164766B1 | 2018-12-25 | |||
| CN107707278A | 2018-02-16 | |||
| CN108809360A | 2018-11-13 | |||
| CN112929022A | 2021-06-08 |
Attorney, Agent or Firm:
SHENZHEN SCIENBIZIP INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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