UHF RFID discrete component read-write module

Abstract

The invention relates to a UHF RFID discrete component read-write module. The UHF RFID discrete component read-write module comprises a main control unit, a phase-locked loop, a transmitting link anda receiving link. The main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is in communication connection with the phase-locked loop, the transmitting link and the receiving link respectively; the main control unit controls the phase-locked loop to lock the signal frequency; the phase-locked loop modulates a carrier signal,the transmitting link comprises a power controllable amplifying circuit which amplifies the power of the carrier signal to the power formulated by the main control unit, the receiving link receives the signal of the transmitting link and enters the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer. The module is long in recognition distance and high in read-write speed; and the design and manufacturing cost can be greatly reduced.

Description

technical field [0001] The invention relates to the field of radio frequency identification, in particular to a UHF RFID discrete component read-write module. Background technique [0002] Currently, the mainstream direction of reading and writing modules used at home and abroad is based on Impinj’s R2000, Austriamicrosystems’ AS3992 or integrated chips produced by domestic companies as platforms. They are highly integrated and easy to design and develop, but relatively expensive. [0003] At the same time, the main direction of the UHF RFID module technology built by discrete components at home and abroad is the zero-IF mixing architecture, which is consistent with the internal framework of the integrated chip. That is, the radio frequency signal generated by the front-end signal generator is transmitted through the power amplifier as a data carrier, and the other route is provided as a local oscillator signal to the mixer, and is mixed with the radio frequency receiving si...

AI Technical Summary

Problems solved by technology

The main problem with this architecture is that the signal power leaked from the transmitted signal to the receiving link is much greater than the power of the received signal, and circuits such as self-interference cancellation must be added to improve the receiving sensitivity of the module, thereby increasing the hardware cost and software workload. Moreover, the cost of power splitters, mixers or quadrature demodulators included in the hardware of this architecture is relatively high

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