CN102831448A - Radio frequency identification device - Google Patents
Radio frequency identification device Download PDFInfo
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- CN102831448A CN102831448A CN2012101565310A CN201210156531A CN102831448A CN 102831448 A CN102831448 A CN 102831448A CN 2012101565310 A CN2012101565310 A CN 2012101565310A CN 201210156531 A CN201210156531 A CN 201210156531A CN 102831448 A CN102831448 A CN 102831448A
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Abstract
The invention relates to a radio frequency identification device which comprises a reader-writer, an antenna and a label, wherein the reader-writer is used for emitting a frequency signal to the label through the antenna, and the label generates a signal of discrete frequency with decimal precision according to the frequency signal, and the signal is sent to a receiving and transmitting module of the reader-writer through the antenna after processed by a modulation unit. According to the invention, a multiple relationship of the discrete frequency is determined uniquely through a multiple relationship among device parameters on a circuit structure, different frequencies are generated without adopting a frequency dividing/frequency doubling method, multiple kinds of return frequencies with decimal frequency dividing characteristics can be generated, thus the application range of the radio frequency identification device is enlarged, and the anti-interference capability of the radio frequency identification device is improved. Though regulating the frequency of a returned signal, the radio frequency identification device avoids multiple interference signals, thereby improving a recognition function. According to the radio frequency identification device, low reference frequency of an on-chip clock oscillator on the label can be used, the power consumption of the label is reduced and is an important property index of a passive radio frequency recognition system, and the maximum recognition distance of the radio frequency identification device can be increased through reducing the power consumption.
Description
Technical field
The present invention relates to the REID field, be specifically related to a kind of rfid device.
Background technology
RF identification (RFID) technology is a kind of contactless automatic identification technology.In radio-frequency recognition system, read write line sends radiofrequency signal and activates RF tag, and receives the radiofrequency signal of returning from label, thereby reaches the purpose of identification.
In the passive ultra-high frequency radio-frequency recognition system, therefore the not charged source of label self need reduce self circuit power consumption as far as possible.In present ultrahigh frequency RFID circuit is realized; Because the generation of return signal speed receives the adjusting of read write line to the label communication procedure parameter; Produce requirement in order to satisfy with certain precision and the continuous adjustable return signal speed of certain limit; Oscillator frequency has brought adverse effect for the reduction power consumption as reference clock signal on the sheet that need be higher.
In the prior art; The frequency signal that label produces is the adjustable frequency that produces through counter and digital frequency division, and its frequency can only be the frequency of oscillator output frequency integral multiple, and in the application of prior art; Some return frequencies can receive fixing the interference, have influenced the recognition function of read write line.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of rfid device, and it not only can reduce the frequency of oscillator on the passive label sheet, reduces chip power-consumption, and can effectively produce multiple return frequency with fractional frequency division characteristic.
A kind of rfid device provided by the invention comprises read write line, antenna and label; Its improvements are; Said read write line through said antenna to said label transmit frequency signal; Said label is back to the transceiver module of said read write line according to the signal that the radiofrequency signal of read write line emission has the discrete frequency of decimal precision through the internal circuit parameter generating through said antenna.
Wherein, the selection of frequency return signal is through the parameter setting of read write line requirement.
Wherein, prime number each other between the speed of return signal.
Wherein, the relation of the multiple between the discrete frequency is confirmed through the relation of the multiple between the parameter of label internal circuit.
Wherein, said label internal circuit comprises energy recovering unit, modulating unit, demodulating unit, reset signal generation unit, agreement control circuit, storer, clock oscillator, clock frequency calibration control unit and encrypting module;
Said energy recovering unit receives the radiofrequency signal of said antenna, for said label provides power supply; Said demodulating unit converts the radiofrequency signal that receives to square wave and passes to said agreement control circuit; Signal is passed to said clock frequency calibration control unit successively with said agreement control circuit and said clock oscillator produces discrete frequency, is transmitted to the transceiver module of said read write line through said modulating unit and said antenna;
Said storer is used to store data;
The voltage that said reset signal generation unit provides in said energy recovering unit resets when being lower than normal voltage;
Said encrypting module is connected with said agreement control circuit, when the user sets, to the authentication and the encryption of communication process and data, improves the security of radio-frequency recognition system.
Wherein, said clock oscillator comprises electric capacity, return difference comparer and the current source of at least one; Electric capacity one end is connected other end ground connection with the reverse input end of return difference comparer; The input end in the same way of return difference comparer connects reference voltage source; The return difference comparer is controlled reset circuit simultaneously and is used for the reset capacitance voltage;
Each current source is provided with a relative coefficient; Said current source is made up of transistor; The transistorized grid of at least one is connected with said agreement control circuit, and its drain electrode is connected with the reverse input end of the comparer of said clock oscillator according to corresponding relative coefficient.
Wherein, said clock frequency calibration control unit comprises the frequency feedback calibration circuit.
Wherein, the reference frequency of said clock oscillator is confirmed by its device parameters.
Wherein, the reference frequency of said clock oscillator is synchronized with the traffic rate of read write line to label through the clock frequency calibration process, is used for obtaining to return accurately speed.
Wherein, the relation of the multiple between the said discrete frequency is to confirm according to the relative coefficient that the current source of said clock oscillator is set; The frequency values of discrete frequency is the product of said reference frequency and relative coefficient.
With the prior art ratio, beneficial effect of the present invention is:
The present invention adopts current source to realize a plurality of frequencies with decimal precision, and it is simple in structure, is easy to realize that cost is low.
The multiple relation of discrete point in frequency of the present invention is confirmed through the relation of the multiple between the device parameters on the circuit structure is unique, need not adopt the method for frequency division/frequency multiplication to produce different frequencies.Can produce multiple return frequency like this, enlarge the range of application of device, improve the antijamming capability of device with fractional frequency division characteristic.
The present invention has avoided a lot of undesired signals, thereby has improved the recognition function of rfid device through the adjustment frequency return signal.
The present invention has reduced the power consumption of label to the selection of the reference frequency of clock oscillator, and the power consumption of label is the important performance indexes of passive radio frequency identification system, reduces the maximum identification distance that power consumption can improve system.
Description of drawings
Fig. 1 is a rfid device synoptic diagram provided by the invention.
Fig. 2 is the circuit structure diagram of the label of rfid device provided by the invention.
Fig. 3 is the structural representation of clock oscillator provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
A kind of rfid device of present embodiment, its structural drawing is as shown in Figure 1, comprises read write line, antenna and label; The improvements of present embodiment are; Read write line through said antenna to said label transmit frequency signal; Said label passes through the internal circuit parameter generating signal of prime number each other according to the radiofrequency signal of read write line emission, is back to the transceiver module of said read write line through said antenna.Its signal frequency of returning can be the optional discrete Frequency point with decimal precision.
Wherein, the label internal circuit is as shown in Figure 2, comprises energy recovering unit, modulating unit, demodulating unit, reset signal generation unit, agreement control circuit, storer, clock oscillator, clock frequency calibration control unit and encrypting module; Said energy recovering unit receives the radiofrequency signal of said antenna, for said label provides power supply (can equivalence be a direct supply); Said demodulating unit is passed to said agreement control circuit with the radiofrequency signal that receives with the square wave that its digital signal converts simulation to; Signal is passed to said clock frequency calibration control unit successively with said agreement control circuit and said clock oscillator produces discrete Frequency point, is transmitted to the transceiver module of said read write line through said modulating unit and said antenna; Unique parameter setting that the selection of frequency return signal requires through read write line; Said storer is used to store the data that receive and send; The voltage that said reset signal generation unit provides in said energy recovering unit resets when being lower than normal voltage.Encrypting module is connected with the agreement control circuit, and when the user needed, module can realize authentication and encryption to communication process and data through encrypting module by back-up system, improves the security of radio-frequency recognition system.The agreement control circuit of present embodiment is to be made up of state machine and combinational logic circuit, accomplishes following function: (1) decoding: the serial digital signal according to receiving demodulates control commands corresponding.(2) tag state control: do the agreement control label transfer deferred to the control command that receives according to system according to current tag state and arrive next state.(3) access data: according to the data in the current states access storage unit of the order that receives.(4) return data generates: according to the content of the order control return data that receives.(5) other: the work of control enciphering/deciphering module, the work of control clock frequency calibration circuit.
The frequency of the return signal of present embodiment is the discrete point in frequency with decimal precision.Multiple relation between its discrete point in frequency is confirmed through the relation of the multiple between the parameter of label internal circuit.Concrete is to confirm according to the relative coefficient that the current source of said clock oscillator is set.The frequency values of discrete point in frequency is the product of said reference frequency and relative coefficient.
Clock oscillator is as shown in Figure 3, comprises electric capacity, return difference comparer and the current source of at least one.Electric capacity one end is connected other end ground connection with the reverse input end of return difference comparer.The input end in the same way of return difference comparer connects an extra reference voltage source (voltage of its output is voltage as a reference), and the return difference comparer is controlled reset circuit simultaneously and is used for the reset capacitance voltage.The reference frequency of clock oscillator is confirmed by its device parameters.Each current source is set a relative coefficient; Said current source is made up of transistor; The transistorized grid of at least one is connected with said agreement control circuit, and its drain electrode is connected with the reverse input end of the comparer of said clock oscillator according to corresponding relative coefficient.Present embodiment is established transistor and is had 8, can set 8 relative coefficients.8 transistorized grids link together, and it becomes common port, are connected with said agreement control circuit, and 8 transistorized source electrodes are connected to label general supply positive pole jointly.8 transistor drain are exported different electric currents and are connected to electric capacity one end through MUX.According to the order request that read write line sends, a reverse input end with the return difference comparer of clock oscillator of selecting accordingly to meet in 8 transistors is connected.Confirmed the output current relation between them through physical size between the transistor of 8 current source correspondences.Through with the product of reference frequency, obtain frequency values, present embodiment is an example with the 64KHz that reader requires; As requested; Choose suitable transistor, be connected with the return difference comparer through MUX, modulating unit emission modulation rate is the transceiver module of the return signal of 64KHz to read write line.If on this back-modulation speed and integer harmonics frequency thereof, have undesired signal; Then can select another back-modulation speed, for example, 320 * 3/7KHz; In the practical implementation; At commonly used return in the speed range (64KHz～640KHz), selected distribution uniform, and a preferred version of discrete frequency point selection in having a class frequency of minimum common divisor the present invention implementing the most.
Said clock frequency calibration control unit comprises the frequency feedback calibration circuit; During fabrication in the process of clock oscillator; There is certain error between the reference frequency of confirming by the actual parameter of device and the reference frequency of setting, so, when label receives radiofrequency signal; Through receiving the specific modulation speed of read write line signal transmitted; Relatively receive the relation of signal and clock oscillator output signal, the frequency of progressive fine setting oscillator is so that the output frequency of oscillator is synchronous and the traffic rate of read write line to label.
The label of the rfid device of present embodiment has been realized following function:
(1) frequency return signal is a series of optional discrete point in frequency with decimal precision.
(2) multiple of these discrete point in frequency relation is confirmed through the relation of the multiple between the device parameters on the circuit structure is unique, need not adopt the method for frequency division/frequency multiplication to produce different frequencies.
(3) reference frequency of oscillator can be chosen lower value on the sheet, to reduce power consumption.
(4) oscillator reference frequency can be synchronized with the traffic rate of read write line to label through the clock frequency calibration process on the sheet, has obtained to return accurately speed.
(5) selection of frequency return signal can directly be specified through the communication process parameter of read write line to label.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a rfid device comprises read write line, antenna and label; It is characterized in that; Said read write line through said antenna to said label transmit frequency signal; Said label is back to the transceiver module of said read write line according to the signal that the radiofrequency signal of read write line emission has the discrete frequency of decimal precision through the internal circuit parameter generating through said antenna.
2. rfid device as claimed in claim 1 is characterized in that, the parameter setting that the selection of frequency return signal requires through read write line.
3. rfid device as claimed in claim 1 is characterized in that, prime number each other between the speed of return signal.
4. rfid device as claimed in claim 3 is characterized in that, the multiple relation between the discrete frequency is confirmed through the relation of the multiple between the parameter of label internal circuit.
5. like claim 1 or 4 arbitrary described rfid devices; It is characterized in that said label internal circuit comprises energy recovering unit, modulating unit, demodulating unit, reset signal generation unit, agreement control circuit, storer, clock oscillator, clock frequency calibration control unit and encrypting module;
Said energy recovering unit receives the radiofrequency signal of said antenna, for said label provides power supply; Said demodulating unit converts the radiofrequency signal that receives to square wave and passes to said agreement control circuit; Signal is passed to said clock frequency calibration control unit successively with said agreement control circuit and said clock oscillator produces discrete frequency, is transmitted to the transceiver module of said read write line through said modulating unit and said antenna;
Said storer is used to store data;
The voltage that said reset signal generation unit provides in said energy recovering unit resets when being lower than normal voltage;
Said encrypting module is connected with said agreement control circuit, when the user sets, to the authentication and the encryption of communication process and data, improves the security of radio-frequency recognition system.
6. rfid device as claimed in claim 5 is characterized in that, said clock oscillator comprises electric capacity, return difference comparer and the current source of at least one; Electric capacity one end is connected other end ground connection with the reverse input end of return difference comparer; The input end in the same way of return difference comparer connects reference voltage source; The return difference comparer is controlled reset circuit simultaneously and is used for the reset capacitance voltage;
Each current source is provided with a relative coefficient; Said current source is made up of transistor; The transistorized grid of at least one is connected with said agreement control circuit, and its drain electrode is connected with the reverse input end of the comparer of said clock oscillator according to corresponding relative coefficient.
7. rfid device as claimed in claim 5 is characterized in that, said clock frequency calibration control unit comprises the frequency feedback calibration circuit.
8. like claim 5 or 6 arbitrary described rfid devices, it is characterized in that the reference frequency of said clock oscillator is confirmed by its device parameters.
9. like claim 5 or 6 arbitrary described rfid devices, it is characterized in that the reference frequency of said clock oscillator is synchronized with the traffic rate of read write line to label through the clock frequency calibration process, be used for obtaining to return accurately speed.
10. rfid device as claimed in claim 2 is characterized in that, the multiple relation between the said discrete frequency is to confirm according to the relative coefficient that the current source of said clock oscillator is set; The frequency values of discrete frequency is the product of said reference frequency and relative coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210156531.0A CN102831448B (en) | 2012-05-18 | 2012-05-18 | A kind of rfid device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210156531.0A CN102831448B (en) | 2012-05-18 | 2012-05-18 | A kind of rfid device |
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| CN102831448A true CN102831448A (en) | 2012-12-19 |
| CN102831448B CN102831448B (en) | 2015-09-09 |
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| CN201210156531.0A Active CN102831448B (en) | 2012-05-18 | 2012-05-18 | A kind of rfid device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530681A (en) * | 2013-10-09 | 2014-01-22 | 煤炭科学研究总院 | System and method for detecting mining product information |
| CN105893905A (en) * | 2016-05-12 | 2016-08-24 | 全普光电科技(上海)有限公司 | Radio frequency identification sensor and projection device with same |
| CN106815615A (en) * | 2015-12-01 | 2017-06-09 | 施政 | A kind of system that many object distance orders are judged on interaction face |
| CN107851206A (en) * | 2015-08-07 | 2018-03-27 | 维普公司 | Power optimization |
| CN113743550A (en) * | 2021-08-30 | 2021-12-03 | 武汉锦象智能科技有限公司 | Intelligent circulation RFID read-write system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5912632A (en) * | 1997-01-08 | 1999-06-15 | International Business Machines Corporation | Single chip RF tag oscillator circuit synchronized by base station modulation frequency |
| CN1701342A (en) * | 2003-08-29 | 2005-11-23 | 赛宝技术公司 | RFID system with selectable backscatter parameters |
| CN202134018U (en) * | 2011-03-22 | 2012-02-01 | 苏州英诺迅科技有限公司 | Radio frequency identification system |
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2012
- 2012-05-18 CN CN201210156531.0A patent/CN102831448B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5912632A (en) * | 1997-01-08 | 1999-06-15 | International Business Machines Corporation | Single chip RF tag oscillator circuit synchronized by base station modulation frequency |
| CN1701342A (en) * | 2003-08-29 | 2005-11-23 | 赛宝技术公司 | RFID system with selectable backscatter parameters |
| CN202134018U (en) * | 2011-03-22 | 2012-02-01 | 苏州英诺迅科技有限公司 | Radio frequency identification system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530681A (en) * | 2013-10-09 | 2014-01-22 | 煤炭科学研究总院 | System and method for detecting mining product information |
| CN103530681B (en) * | 2013-10-09 | 2017-01-11 | 煤炭科学技术研究院有限公司 | System and method for detecting mining product information |
| CN107851206A (en) * | 2015-08-07 | 2018-03-27 | 维普公司 | Power optimization |
| CN106815615A (en) * | 2015-12-01 | 2017-06-09 | 施政 | A kind of system that many object distance orders are judged on interaction face |
| CN106815615B (en) * | 2015-12-01 | 2019-11-29 | 施政 | The system of more object distance sequences is judged on a kind of interaction face |
| CN105893905A (en) * | 2016-05-12 | 2016-08-24 | 全普光电科技(上海)有限公司 | Radio frequency identification sensor and projection device with same |
| CN113743550A (en) * | 2021-08-30 | 2021-12-03 | 武汉锦象智能科技有限公司 | Intelligent circulation RFID read-write system |
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|---|---|
| CN102831448B (en) | 2015-09-09 |
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