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UHF RFID reader-writer receiver

A technology for receivers and readers, which is applied in the field of radio frequency transceivers, can solve the problems of reducing the reading distance of the reader-writer tag, and achieve the effects of increasing the reading distance, eliminating DC offset, and improving sensitivity

Pending Publication Date: 2017-01-18
CHIZHOU RICHSEMI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although smaller signal transmission power can reduce carrier leakage, it will also reduce the tag reading distance of the reader

Method used

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  • UHF RFID reader-writer receiver

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Embodiment Construction

[0011] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0012] As shown in the figure, a UHF RFID reader receiver includes a carrier leakage elimination circuit, a radio frequency front-end circuit, a DC elimination circuit, a signal selection filter, a programmable gain amplifier, and a delta-sigma analog-to-digital converter. The leakage elimination circuit is connected with the signal receiving front end, and then connected into the radio frequency front end circuit, the radio fr...

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Abstract

The invention relates to a UHF RFID reader-writer receiver, and belongs to the technical field of radio-frequency transceivers. The UHF RFID reader-writer receiver comprises a carrier leak elimination circuit, a radio-frequency front-end circuit, direct current elimination circuits, signal selection filters, programmable gain amplifiers and Delta-Sigma analog-to-digital converters. The carrier leak elimination circuit is connected with a signal receiving front end and then connected to the radio-frequency front-end circuit. The radio-frequency front-end circuit includes a channel-I mixer and a channel-Q mixer. The direct current elimination circuits, the signal selection filters, the programmable gain amplifiers and the Delta-Sigma analog-to-digital converters are connected in sequence. The channel-I mixer and the channel-Q mixer are each connected to one direct current elimination circuit. The noise coefficient of the receiver is reduced, the sensitivity of the UHF RFID reader-writer receiver is improved, and the passive tag reading distance of the reader is improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency transceivers, in particular to a UHF RFID reader-writer receiver. Background technique [0002] UHF is ultra-high frequency, and the frequency range is 300MHz~3000MHz. For passive UHF RFID systems, the communication between the reader and the tag is realized in a half-duplex manner. The reader-writer transmits the modulated carrier wave to the tag, and the tag located in the identification area of ​​the reader-writer feeds back information to the reader-writer in the form of backscattering, and the reader-writer communicates with the tag according to the protocol. During the process of reading passive tags, the reader / writer simultaneously transmits carrier waves to provide energy for passive tags through electromagnetic wave radiation. [0003] The unique tag backscattering mechanism of the passive UHF RFID system makes the frequency of the reader receive the tag modulation signal differ...

Claims

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Application Information

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IPC IPC(8): G06K17/00
CPCG06K17/00
Inventor 陈友兵
Owner CHIZHOU RICHSEMI ELECTRONICS
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