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Method for performing phase calibration in a front-end circuit of a near-field communication nfc tag device, a front-end circuit, and an nfc tag device

A front-end circuit and near-field communication technology, which is applied in near-field transmission systems, near-field transmission systems in radio frequency identification systems, read/write/query/identify near-field transmission systems, etc., can solve problems such as long test time

Active Publication Date: 2019-12-20
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although currently used equipment is based on the automation of sweeping phase settings in labeling equipment, the achievable test times are still too long

Method used

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  • Method for performing phase calibration in a front-end circuit of a near-field communication nfc tag device, a front-end circuit, and an nfc tag device
  • Method for performing phase calibration in a front-end circuit of a near-field communication nfc tag device, a front-end circuit, and an nfc tag device
  • Method for performing phase calibration in a front-end circuit of a near-field communication nfc tag device, a front-end circuit, and an nfc tag device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0095] Figure 4 A first exemplary embodiment of a phase calibration method according to the proposed principle is shown.

[0096] In step S1, the front-end circuit receives the reference signal generated by the NFC test signal generator device.

[0097] In step S2, the front-end circuit receives a phase calibration command. Wherein, the phase calibration command is, for example, provided by the host component of the NFC tag device whose front-end circuit is being phase calibrated.

[0098] In step S3, the front-end circuit generates an active load modulation signal having a pre-configured phase difference with respect to the received reference signal. The different phase difference values ​​used one after the other in the described method are stored beforehand in a memory (for example a register in the front-end circuit). It is also defined in advance: the stored value is used first as a pre-configured or default phase difference value.

[0099] In step S4, the amplitude ...

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Abstract

A method for performing phase calibration in a front-end circuit of a near-field communication NFC tag device has the following steps: receiving a reference signal generated by an NFC signal generator device; receiving a phase calibration command; generating an active load modulation signal, the active source load modulation signal having a pre-configured value with respect to the phase difference of the reference signal of the NFC signal generator device; measuring the amplitude of a test signal present at the antenna of the NFC tag device by passing the reference signal generated by being superimposed with the active load modulation signal; repeating the steps of: modifying the value of the phase difference, providing the active load modulation signal with the modified value of the phase difference, measuring the amplitude of the test signal, and comparing the measured amplitude with the previously measured amplitude or a reference amplitude until the measured amplitude satisfies a predefined condition; storing the value of the phase difference corresponding to the previously measured amplitude.

Description

technical field [0001] This application relates to Near Field Communication (NFC) in contactless systems. In particular, the present application relates to a method for phase calibration in a front-end circuit of an NFC tag device, a front-end circuit and an NFC tag device. Background technique [0002] NFC tag devices are employed in radio frequency identification (RFID) systems that allow communication between an NFC tag device and a corresponding NFC reader device using inductive coupling. During this communication, the reader mainly sends commands to the tag. The tag then responds by transmitting data (eg, identification information) to the reader. Typically tag and reader devices operate according to industry standards. ISO / IEC 14443 is an example of such an industry standard and is the basis of this application. [0003] ISO / IEC 14443 defines contactless chip cards with integrated NFC tag devices in proximity coupling applications. Readers operating according to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00G06K7/10H04B5/00
CPCH04B17/21G06K7/0095G06K7/10237H04B5/0031H04B5/0056H04B5/0062
Inventor N·科迪尔
Owner STMICROELECTRONICS SRL