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Power self-adaptive variable data rate communicator and method based on RF identification

A radio frequency identification and communication device technology, applied in the direction of automatic power control, electromagnetic radiation induction, electrical components, etc., can solve the problems of the label card cannot be recognized, the efficiency is low, and the identification time of the label card is long, and the recognition distance can be achieved. And the effect of the optimal recognition rate

Inactive Publication Date: 2005-03-30
FUDAN UNIV
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Problems solved by technology

In this way, when the distance between the tag card and the reader is close and there are many cards, the time for the reader to recognize all the tag cards will be very long. When the distance between the tag card and the reader is long, due to the fixed data communication rate , the energy of the tag card end will not be able to support the work of the chip in the card, which will make the tag card unrecognizable
This can lead to poor performance and inefficiency of the RFID system

Method used

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  • Power self-adaptive variable data rate communicator and method based on RF identification
  • Power self-adaptive variable data rate communicator and method based on RF identification
  • Power self-adaptive variable data rate communicator and method based on RF identification

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Embodiment Construction

[0026] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] figure 2 It is a structural diagram of the internal automatic adjustment circuit of the radio frequency tag chip and the off-chip antenna impedance matching; A power generating module 25 , a receiving / transmitting module 26 , a digital baseband control module 27 and a power adaptive clock module 23 .

[0028] Wherein the power adaptive clock module 23 such as image 3 As shown, it includes a power supply voltage quantization module 31, a frequency and phase detector 32, a low-pass filter 33, a voltage-controlled oscillator 34, a 1:n frequency divider 35, a frequency divider 36 and a sampling module 37.

[0029] Since there is no power supply on the chip, the above-mentioned power supply is the energy recovered by the radio frequency identification tag from the radio frequency signal through the rectification module for the chip in ...

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Abstract

The device is composed of antenna, matching network outside chip and label chip in radio frequency. The label chip in radio frequency includes bridge type rectification, generation of power source, receiving / transmitting, digital baseband control, and power self-adapting clock etc modules. Module of quantizing voltage supply quantizes voltage, and sets up frequency division number of 1 : n frequency divider. Dividing frequency is carried out based on frequency division number so as to output operation timing of label chip system and decide communication speed rate for returning data. Then, next chip is monitored circularly till all chips are traversed. Applicable to remote radio frequency recognition system, the disclosed method realizes communication in self-adapting variable data rate so as to reach optimum identification distance and identification data rate in operation of identifying radio frequency.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, in particular to a radio frequency identification communication device and method, in particular to a long-distance radio frequency identification power self-adaptive variable data rate communication device and method. Background technique [0002] With the rapid development of microelectronics technology, CMOS (complementary metal oxide semiconductor) technology has been able to manufacture chips used in microwave bands, and radio frequency circuits can be integrated into large-scale digital circuit chips. Low-cost wireless systems manufactured with CMOS technology will open up wider application fields. Radio frequency tags are a very promising application field. [0003] When the barcode was launched in 1973, its inventor predicted that 25 years later, there would be a new technology to replace the barcode. Now, radio frequency tags have come to people. It is not only a sim...

Claims

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Application Information

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IPC IPC(8): G06K7/10H03L7/08
Inventor 李强王俊宇韩益锋闵昊
Owner FUDAN UNIV
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