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Clock synchronization in rfid equipped devices

A technology of equipment and internal clock, applied in the field of processing system, which can solve the problems of reducing antenna coupling factor and reducing sideband level of wireless signal, etc.

Active Publication Date: 2017-09-12
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the antenna size of the RFID module reduces the antenna coupling factor and, therefore, reduces the sideband level of the corresponding wireless signal

Method used

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  • Clock synchronization in rfid equipped devices
  • Clock synchronization in rfid equipped devices
  • Clock synchronization in rfid equipped devices

Examples

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Embodiment Construction

[0015] It will be readily understood that the components of the embodiments generally described herein and shown in the drawings may be arranged and designed in many different configurations. Accordingly, the following detailed description of various embodiments presented in the accompanying drawings is not intended to limit the scope of the present disclosure, but is merely representative of various embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless expressly indicated.

[0016] In all cases, the examples should be considered illustrative and not restrictive. The scope of the invention, therefore, is indicated by the appended claims rather than by this detailed description. All changes within the equivalent meaning and range of the claims are included in the scope.

[0017] Throughout this specification, reference to features, advantages or similar language does not imply that all of th...

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PUM

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Abstract

Embodiments of a method for clock synchronization in a radio frequency identification RFID-equipped device, an RFID-equipped device, and a handheld communication device are described. In one embodiment, a method for clock synchronization in an RFID-equipped device involves measuring the difference between a field clock frequency generated from an external clock and an internal clock frequency generated from an internal clock, and responsive to the measured The difference, in the RFID-equipped device, yields the output bits. Generating the output bits involves adjusting the bit length of at least one of the output bits in response to the measured difference. Other embodiments are also described.

Description

technical field [0001] Embodiments of the present invention generally relate to processing systems and methods, and more particularly, to systems and methods for clock synchronization. Background technique [0002] Devices equipped with radio frequency identification (RFID) include embedded integrated circuits that can be used to store information. For example, RFID tags are used in financial, transportation, security, medical or other applications to provide identification and authentication information. RFID-equipped devices include antennas, such as inductive antennas, to receive and transmit wireless signals via magnetic or electromagnetic fields. [0003] Handheld communication devices such as smartphones increasingly include built-in RFID modules for identification and authentication. However, integrating RFID modules into mobile devices presents challenges. For example, RFID modules typically have antennas with relatively large physical dimensions, such as approxim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04B5/48
CPCH04J3/0685H04L7/0012H04L7/0331G06K19/0727G06K19/07749H04B5/77H04B5/26G06K7/10386
Inventor 克莱门斯·布雷托夫斯彼得·蒂林格
Owner NXP BV