Passive ultrahigh frequency radio frequency identification chip backscatter link frequency generation circuit and method
A backscattering and radio frequency identification technology, applied to record carriers, instruments, computer parts, etc. used in machines, can solve the problem of increasing the complexity of digital baseband circuit design, the inability of the reader to recognize the chip normally, and reducing the reading and writing distance of the chip. and other problems to achieve the effect of enhancing adaptability, reducing power consumption, and increasing working distance
Inactive Publication Date: 2012-05-09
XIDIAN UNIV
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Problems solved by technology
On the one hand, this leads to an increase in the design complexity of the digital baseband circuit, increases the power consumption of the chip, and reduces the reading and writing distance of the chip; Normal identification chip
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[0044] refer to Figure 5 , the structure of the passive UHF RFID chip applied in the present invention includes: an analog front-end circuit 510 , a digital baseband circuit 520 and a memory 530 . Among them, the analog front-end circuit 510 is used to generate the chip working power and the backscatter clock frequency BLF, and demodulate the command sent by the reader from the high-frequency carrier, and change the chip impedance according to the control of the digital baseband circuit 520; The digital baseband circuit 520 is used for analyzing the data demodulated by the analog front-end circuit 510 and performing corresponding operations; the memory 530 is used for storing information or writing information by the digital baseband circuit 520 . in:
[0045] The analog front-end circuit 510 includes: a charge pump circuit 511, a power management circuit 512, a demodulation circuit 513, a modulation circuit 514, an inverse scattering link frequency generation circuit 515 an...
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The invention discloses a passive ultrahigh frequency radio frequency identification chip backscatter link frequency generation circuit and a method, mainly solving the problems that the existing circuit has larger power consumption and needs frequency calibration. In the invention, input PIE signals are detected, a first integrator and a second integrator are controlled to integrate in set time,and the integration results are compared by a comparer; at the second falling edge after an order begins, a third integrator is controlled to integrate; at the third falling edge after an order begins, the third integrator is controlled to stop integrating, and if the data preserved by a register is 0, the output of the comparer is written into the register; the output voltage of the third integrator and the data preserved by the register are used for controlling a relaxation oscillator to obtain backscatter link frequency required by a reader-writer. The invention has the advantages of low power consumption and no need for frequency calibration, and can be applied to passive ultrahigh frequency radio frequency identification chip backscatter link frequency generation circuit.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a circuit and a method for generating a backscatter link frequency (BLF) of a passive ultra-high frequency radio frequency identification (UHF RFID) chip, which can be used for a backscatter chain of a passive ultra high frequency radio frequency identification chip channel frequency generation. Background technique [0002] Radio Frequency Identification (RFID) includes a technology of storing unique identification information in an IC chip, and identifying, tracking, or managing objects attached to the IC chip using the radio frequency. The basic structure of an RFID system includes an RFID tag for storing unique identification information; and an RFID reader for reading or writing information stored in the tag. [0003] figure 1 It is the basic structure of the existing RFID system, in which the reader sends an excitation signal containing commands according to a c...
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IPC IPC(8): G06K19/073
Inventor 庄奕琪唐龙飞刘伟峰李小明靳钊
Owner XIDIAN UNIV