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A RFID tag chip signal reflection method

A technology of RFID tags and signal reflection, applied in the field of radio frequency identification, can solve the problems of increasing the cost of RFID systems and achieve the effect of improving controllability

Active Publication Date: 2017-09-22
芯动微电子科技(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is generally necessary to calibrate the frequency of the oscillator to obtain a more accurate frequency, but this increases the cost of the RFID system

Method used

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  • A RFID tag chip signal reflection method
  • A RFID tag chip signal reflection method

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Embodiment Construction

[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings and examples, so that those skilled in the art of the present invention can easily implement the present invention.

[0019] The RFID tag chip signal reflection method provided in this embodiment includes the following process:

[0020] (1) The reader randomly selects or specifies a frequency through its internal modulation frequency selection circuit as the signal modulation frequency for communication between the reader and the tag chip;

[0021] (2) The reader modulates the data containing instruction information into the carrier according to the selected signal modulation frequency, and transmits the modulated carrier signal to the tag chip;

[0022] (3) The tag chip demodulates the received carrier signal, uses its internal clock data recovery circuit to restore the instruction information of the reader, and locks the frequency of the demo...

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Abstract

The invention discloses a signal reflection method of an RFID tag chip, which is used for data communication between the RFID tag chip and a reader. The method includes: the reader randomly selects or specifies a signal modulation frequency; modulates the data containing instruction information In the carrier wave, and transmit the modulated carrier signal to the tag chip; the tag chip demodulates the carrier signal, recovers the instruction information of the reader, and locks the frequency of the demodulated signal; the tag chip selects a signal reflection frequency , as a signal frequency for communication between the tag chip and the reader, generate a tag reflection signal at the frequency, and reflect the feedback information back to the reader. The invention improves the controllability of the signal reflection frequency of the tag chip and the safety of the RFID system.

Description

technical field [0001] The invention relates to radio frequency identification technology, in particular to a data communication method between an RFID tag chip and a reader, and in particular to a signal reflection method of an RFID tag chip. With this method, the tag chip locks the signal modulation frequency of the reader and selects the signal reflection frequency according to the instruction information sent by the reader to realize the communication between the RFID tag chip and the reader, which improves the controllability of the signal reflection frequency of the tag chip. and the security of the RFID system. Background technique [0002] RFID (Radio Frequency Identification Technology) is an automatic identification technology produced by combining integrated circuits and wireless communication technologies. Structurally, RFID includes readers and transponders (usually tag chips) and software systems. According to the adopted technical standards, traditional RFID...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 敖海李伟
Owner 芯动微电子科技(珠海)有限公司