CN111988066A - UHF RFID discrete component read-write module - Google Patents
UHF RFID discrete component read-write module Download PDFInfo
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- CN111988066A CN111988066A CN202010953384.4A CN202010953384A CN111988066A CN 111988066 A CN111988066 A CN 111988066A CN 202010953384 A CN202010953384 A CN 202010953384A CN 111988066 A CN111988066 A CN 111988066A
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- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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Abstract
The invention relates to a UHF RFID discrete element read-write module, which comprises a main control unit, a phase-locked loop, a transmitting link and a receiving link, wherein the phase-locked loop is connected with the main control unit; the main control unit receives a command sent by an upper computer connected with the main control unit, and the main control unit is respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit which amplifies the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer. The invention has the advantages of long identification distance and high reading and writing speed; and the design and manufacturing cost can be greatly reduced.
Description
Technical Field
The invention relates to the field of radio frequency identification, in particular to a read-write module of a UHF RFID discrete element.
Background
The mainstream direction of the current read-write module used at home and abroad is based on R2000 of England, AS3992 of Austrian microelectronics or integrated chips produced by domestic companies AS platforms, the integration level is high, the design and development are convenient, but the relative cost is high.
Meanwhile, the UHF RFID module technology built by discrete elements at home and abroad is mainly oriented to a zero intermediate frequency mixing framework and is consistent with an internal framework of an integrated chip. One path of radio frequency signals generated by the front-end signal generator is transmitted out as data carriers through the power amplifier, and the other path of radio frequency signals is provided to the frequency mixer as local oscillation signals and is mixed with radio frequency receiving signals to obtain zero intermediate frequency signals. The main problem of the architecture is that the signal power of the transmit signal leaking to the receive link is much larger than the power of the receive signal, and circuits such as self-interference cancellation must be added to improve the receive sensitivity of the module, thereby increasing the hardware cost and the workload of software, and the hardware of the architecture includes a power divider, a mixer or a quadrature demodulator with higher cost.
Disclosure of Invention
The invention provides a UHF RFID discrete element read-write module for solving the problems, which has the advantages of long identification distance and high read-write speed; and the design and manufacturing cost can be greatly reduced.
To achieve the above object, the present invention is realized by: a UHF RFID discrete component read-write module comprises a main control unit, a phase-locked loop, a transmitting link and a 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 respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit which amplifies the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer.
The main control unit comprises a data communication unit, a coding and decoding unit and a link control unit connected with a phase-locked loop and a power controllable amplifying circuit.
In a further preferred embodiment, the phase locked loop comprises a VCO (voltage controlled oscillator) connected to the power controllable amplifier circuit and a loop filter.
The further optimization scheme is that the transmitting link further comprises a channel isolation unit connected with the power controllable amplification circuit and a phase deflection unit connected with the isolation unit.
The further optimization scheme is that the receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the bit deflection unit, and the voltage comparison unit is connected with the main control unit.
In a further preferred embodiment, the envelope detection unit includes a schottky diode for detecting the modulated signal.
Compared with the prior art, the invention has the following advantages: the UHF RFID discrete element read-write module has the advantages of long identification distance, high read-write speed, multi-label one-time reading, low cost and high receiving sensitivity, and can greatly reduce the design and manufacturing cost.
The invention eliminates integrated chips such as a power divider, a directional coupler, a quadrature modulator, a mixer and the like in a mainstream frame. And a zero intermediate frequency detection scheme is adopted to replace a mixing frame, so that the cost of main stream frame hardware is greatly reduced.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the overall structure of the UHF RFID discrete component read-write module of the present invention.
Detailed Description
The specific embodiment is as follows:
referring to fig. 1, a UHF RFID discrete component read-write module includes a main control unit, a phase-locked loop, a transmitting link and a 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 respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls the frequency of a phase-locked loop locking signal, and comprises a data communication unit, a coding and decoding unit and a link control unit connected with the phase-locked loop and the power-controllable amplifying circuit. The phase-locked loop comprises a VCO (voltage controlled oscillator) and a loop filter which are connected with the power controllable amplifying circuit, the phase-locked loop modulates a carrier signal, and the transmitting link comprises the power controllable amplifying circuit which amplifies the power of the carrier signal to the power set by the main control unit, a channel isolation unit connected with the power controllable amplifying circuit and a phase deflection unit connected with the channel isolation unit. The receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the bit deflection unit, and the voltage comparison unit is connected with the main control unit; the envelope detection unit comprises a Schottky diode for detecting the modulation signal; the receiving link receives signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to the upper computer.
The main control unit is mainly responsible for the data communication function with a subsequent unit; meanwhile, the phase-locked loop is responsible for controlling the signal frequency required by the phase-locked loop locking by using I2C, regulating the power of a transmitted signal and modulating and demodulating the signal; the phase-locked loop is mainly responsible for generating a carrier signal required by modulation, the frequency stability of the phase-locked loop determines the performance of the whole hardware, the frequency controllability of the phase-locked loop is realized by using the main control unit, and the bandwidth required by a protocol is met; the power controllable amplifying circuit is mainly responsible for amplifying the power of the carrier signal to the power formulated by the main control unit, and the power amplifier has good conversion efficiency and gain linearity; the channel isolation mainly functions to increase the signal isolation between the transmitting and receiving links; the receiving chain is mainly responsible for envelope detection and signal amplification and comparison.
The working process of the invention is as follows: according to the UHF RFID discrete component read-write module, a main control unit receives a command sent by an upper computer, starts a corresponding module task, codes a protocol stack command corresponding to the corresponding task in the main control unit, and sends the coded protocol stack command to a radio frequency link for modulation; meanwhile, the main control unit configures a phase-locked loop and a power amplifying circuit according to the task command; the modulated signal is transmitted to a reader antenna after being amplified by power and sent out; the tag receives the carrier wave sent by the reader-writer antenna, obtains energy to wake up work, executes the received read-write module command at the same time, and sends the returned response information to the reader-writer antenna. And after the phase of the return signal is adjusted, the modulation signal is detected by a Schottky diode to obtain a T/Q double-path digital baseband signal, the T/Q double-path digital baseband signal is amplified and combined into a single-path baseband signal in a voltage comparator, the single-path baseband signal enters a main control unit for demodulation to obtain label information, and the main control unit transmits the label information to an upper computer.
The invention eliminates integrated chips such as a power divider, a directional coupler, a quadrature modulator, a mixer and the like in a mainstream frame. And a zero intermediate frequency detection scheme is adopted to replace a mixing frame, so that the cost of main stream frame hardware is greatly reduced.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A UHF RFID discrete component read-write module is characterized in that: the device comprises a main control unit, a phase-locked loop, a transmitting link and a 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 respectively in communication connection with the phase-locked loop, the transmitting link and the receiving link; the main control unit controls a phase-locked loop to lock signal frequency, the phase-locked loop modulates carrier signals, a transmitting link comprises a power-controllable amplifying circuit which amplifies the power of the carrier signals to the power set by the main control unit, a receiving link receives the signals of the transmitting link, the signals enter the main control unit to be demodulated to obtain label information, and the main control unit transmits the information to an upper computer.
2. The UHF RFID discrete component read-write module of claim 1, wherein: the main control unit comprises a data communication unit, a coding and decoding unit and a link control unit connected with a phase-locked loop and a power controllable amplifying circuit.
3. The UHF RFID discrete component read-write module of claim 1, wherein: the phase locked loop comprises a VCO and a loop filter connected to a power controllable amplification circuit.
4. The UHF RFID discrete component read-write module of claim 1, wherein: the transmitting chain also comprises a channel isolation unit connected with the power controllable amplifying circuit and a phase deflection unit connected with the isolation unit.
5. The UHF RFID discrete component read-write module of claim 4, wherein: the receiving link comprises an envelope detection unit, a differential amplification unit and a voltage comparison unit which are sequentially connected, the envelope detection unit is connected with the bit deflection unit, and the voltage comparison unit is connected with the main control unit.
6. The UHF RFID discrete component read-write module of claim 5, wherein: the envelope detection unit includes a schottky diode that detects the modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010953384.4A CN111988066A (en) | 2020-09-11 | 2020-09-11 | UHF RFID discrete component read-write module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010953384.4A CN111988066A (en) | 2020-09-11 | 2020-09-11 | UHF RFID discrete component read-write module |
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| CN111988066A true CN111988066A (en) | 2020-11-24 |
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| CN202010953384.4A Pending CN111988066A (en) | 2020-09-11 | 2020-09-11 | UHF RFID discrete component read-write module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665906A (en) * | 2022-01-26 | 2022-06-24 | 浙江天璇智控科技有限公司 | Intelligent beacon host |
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| JP2006229433A (en) * | 2005-02-16 | 2006-08-31 | Denso Wave Inc | Rfid tag system, rfid tag, and tag reader |
| CN101071469A (en) * | 2006-05-11 | 2007-11-14 | 北京泛在物联科技有限公司 | Radio frequency electronic label reader and its use method |
| CN102622620A (en) * | 2012-01-10 | 2012-08-01 | 上海交通大学 | Wireless identification read-write device |
| CN103218644A (en) * | 2013-05-08 | 2013-07-24 | 岳流锋 | Carrier-wave-cancelled ultrahigh-frequency electronic tag reader |
| CN203350897U (en) * | 2013-06-07 | 2013-12-18 | 江苏东大集成电路系统工程技术有限公司 | UHF read-write module of mobile data terminal |
| CN106127091A (en) * | 2016-06-30 | 2016-11-16 | 天津工业大学 | A kind of intelligent UHFRFID reader based on DSP |
| CN107729784A (en) * | 2017-09-27 | 2018-02-23 | 北京市振隆科技股份有限公司 | Multi-band frequency multi-protocol power adjustable RFID reader and its reading/writing method |
-
2020
- 2020-09-11 CN CN202010953384.4A patent/CN111988066A/en active Pending
Patent Citations (7)
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| JP2006229433A (en) * | 2005-02-16 | 2006-08-31 | Denso Wave Inc | Rfid tag system, rfid tag, and tag reader |
| CN101071469A (en) * | 2006-05-11 | 2007-11-14 | 北京泛在物联科技有限公司 | Radio frequency electronic label reader and its use method |
| CN102622620A (en) * | 2012-01-10 | 2012-08-01 | 上海交通大学 | Wireless identification read-write device |
| CN103218644A (en) * | 2013-05-08 | 2013-07-24 | 岳流锋 | Carrier-wave-cancelled ultrahigh-frequency electronic tag reader |
| CN203350897U (en) * | 2013-06-07 | 2013-12-18 | 江苏东大集成电路系统工程技术有限公司 | UHF read-write module of mobile data terminal |
| CN106127091A (en) * | 2016-06-30 | 2016-11-16 | 天津工业大学 | A kind of intelligent UHFRFID reader based on DSP |
| CN107729784A (en) * | 2017-09-27 | 2018-02-23 | 北京市振隆科技股份有限公司 | Multi-band frequency multi-protocol power adjustable RFID reader and its reading/writing method |
Non-Patent Citations (1)
| Title |
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| 张晓鹏, 朱云龙, 罗海波: "超高频射频识别系统读写器设计", 电子器件, no. 03, 26 September 2005 (2005-09-26), pages 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665906A (en) * | 2022-01-26 | 2022-06-24 | 浙江天璇智控科技有限公司 | Intelligent beacon host |
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