CN1601547A - Power self-adaptive variable data rate communicator and method based on RF identification - Google Patents
Power self-adaptive variable data rate communicator and method based on RF identification Download PDFInfo
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- CN1601547A CN1601547A CN 200410067341 CN200410067341A CN1601547A CN 1601547 A CN1601547 A CN 1601547A CN 200410067341 CN200410067341 CN 200410067341 CN 200410067341 A CN200410067341 A CN 200410067341A CN 1601547 A CN1601547 A CN 1601547A
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Abstract
The device is composed of antenna, matching network outside chip and label chip in radio frequency. The label chip in radio frequency includes bridge type rectification, generation of power source, receiving/transmitting, digital baseband control, and power self-adapting clock etc modules. Module of quantizing voltage supply quantizes voltage, and sets up frequency division number of 1 : n frequency divider. Dividing frequency is carried out based on frequency division number so as to output operation timing of label chip system and decide communication speed rate for returning data. Then, next chip is monitored circularly till all chips are traversed. Applicable to remote radio frequency recognition system, the disclosed method realizes communication in self-adapting variable data rate so as to reach optimum identification distance and identification data rate in operation of identifying radio frequency.
Description
Technical field
The invention belongs to the integrated circuit (IC) design technical field, be specifically related to a kind of radio-frequency (RF) identification communication device and method, relate in particular to a kind of remote radio-frequency (RF) identification power adaptive and become data transfer rate communication device and method.
Background technology
Along with the develop rapidly of microelectric technique, CMOS (complementary metal oxide semiconductor (CMOS)) technology can be made the chip that is applied to microwave region, and radio circuit can be integrated on the chip of large scale digital circuit.Low-cost wireless system with the manufacturing of CMOS technology will open more broad application.Radio-frequency (RF) tag is exactly an extraordinary application of prospect.
When bar code was pushed out in 1973, its inventor once foretold: after 25 years, will have a kind of new technology to substitute bar code.Now, radio-frequency (RF) tag is gone in face of the people.It is not only the simple substitute of bar code, more can the comprehensive wireless communication, up-to-date information technology such as microelectronics, internet, all national products are carried out carrying out the whole process supervision management from producing, selling and uying even recycling, greatly improve the running efficiency of entire society.
The working frequency range of radio-frequency (RF) tag comprises 1: the low frequency tags frequency of operation is at 30kHz-300kHz, and typical frequency of operation has: 125kHz, 133kHz.2: the high-frequency label frequency of operation is at 3MHz-30MHz, and typical frequency of operation is 13.56MHz.3: ultrahigh frequency label frequency of operation is greater than 400MHz, and the exemplary operation frequency is 915MHz, 2.45GHz, 5.8GHz.
Complete radio-frequency recognition system usually by reader, radio-frequency (RF) tag, and communications protocol form.Fig. 1 is the synoptic diagram of a complete radio-frequency recognition system.
General radio-frequency recognition system is inversely proportional to the decipherment distance of radio-frequency (RF) tag and the work power consumption of radio frequency tag chip, and the speed of identification is directly proportional with the return data communication speed of label chip.In the standard agreement of existing high band radio-frequency identification card system, as ISO18000-6, to the single signaling rate that is defined as of the data communication speed between reader and the card.Therefore, in existing high band radio-frequency recognition system, fixing data communication speed and the reader of the employing that label card can only be passive carries out exchanges data.Like this, when label card and the nearer card of reader distance are more, the time that reader identifies all label cards will be very long, when the distance of label card and reader is far away, because data communication speed is fixed, the energy of label card end can not support card in chip operation, will make label card not to be identified.This can cause the performance of radio-frequency recognition system to descend inefficiency.
If RFID tag can be regulated the return data communication speed of label chip automatically according to the energy size that is received, decipherment distance and recognition time to radio-frequency recognition system carry out the self-adaptation adjusting, will can improve a lot to the performance of radio-frequency recognition system.
Summary of the invention
The object of the present invention is to provide a kind of power adaptive that is used for radio frequency identification label chip to become the apparatus and method of data transfer rate communication, by in the label card chip, increasing the power adaptive clock module, decide data communication speed between label internal work clock and the reader according to label received energy power, with the decipherment distance of realizing radio-frequency recognition system and the optimum of recognition time.
The objective of the invention is to be achieved through the following technical solutions:
A kind of power adaptive that is used for radio-frequency (RF) identification becomes the data transfer rate communication device, at least comprise: antenna 21, outer matching network 22 of sheet and radio frequency tag chip, wherein radio frequency tag chip comprises again, bridge rectifier module 24, power supply generation module 25, reception/sending module 26, digital baseband control module 27 and power adaptive clock module 23.
Among the present invention, power adaptive clock module 23 comprises supply voltage quantization modules 31, frequency discrimination phase demodulation module 32, low-pass filtering module 33, voltage controlled oscillator 34,1:n frequency divider 35, frequency divider 36 and sampling module 37 compositions as shown in Figure 3.Wherein, supply voltage quantizer 31 links to each other by n position supply voltage indicator signal with 1:n frequency divider 35, frequency discrimination phase demodulation module 32 is carried out bit comparison mutually with the signal of serial data and frequency divider 36 outputs of input, input serial data is sampled and realizes the data recovery thereby the control voltage to voltage-controlled oscillator (VCO) 34 by low-pass filtering module 33 obtains the input sample frequency of sampling module 37; Voltage controlled oscillator 34 produces the input comparison clock of phase frequency detector 32 and the work clock of the interior digital baseband of sheet with frequency divider 36 and 1:n frequency divider simultaneously.
The network that described supply voltage quantization modules 31 is made up of resistance and comparer, the supply voltage of input is compared with n varying level value after the normal voltage dividing potential drop, obtains the supply voltage indicator signal of n position.Its structure is shown in Figure 4, is a kind of common comparator configuration.
A kind of power adaptive that is used for radio-frequency (RF) identification becomes the data transfer rate means of communication, comprises the steps: at least
Reset earlier behind the current chip power, then the supply voltage of 31 pairs of rectifier outputs of supply voltage quantization modules quantizes, and produces a control signal according to voltage swing, sets the divider ratio of 1:n frequency divider 35 then.Input serial data to reader carries out clock and data recovery, and its data transfer rate is locked.Divider ratio according to 1:n frequency divider 35 carries out frequency division again, thereby the communication speed of output label chip system work clock and decision return data is monitored next chip continuation circulation, then until all chips traversals.
According to the divider ratio decision output label chip system work clock of 1:n frequency divider 35 and the communication speed of return data, when energy is enough, the 1:n frequency divider is chosen little clock division with output two-forty clock, make the chip digital baseband processing speed accelerate, and with the higher data return data; When energy was low, the 1:n frequency divider was chosen big clock division with output low rate clock, makes the chip digital baseband processing speed slow down, and with the lower data rate return data.
The power adaptive that is used for radio-frequency (RF) identification that utilizes the present invention to propose becomes data transfer rate communication device and method, the energy size that can receive according to chip, automatically take different system clocks, realize the communication of adaptive change data transfer rate, can reach the decipherment distance and the recognition rate optimum of radio-frequency (RF) identification.
Description of drawings
Fig. 1 is the synoptic diagram of complete radio-frequency recognition system;
Fig. 2 is an auto-adjusting circuit structural drawing in radio frequency tag chip and the sheet outside antenna impedance matching sheet;
Fig. 3 is a power adaptive clock module structural drawing;
Fig. 4 is the signal of supply voltage quantization modules circuit;
Fig. 5 is a 1:n divider circuit synoptic diagram;
Fig. 6 becomes data transfer rate communication flow figure for the radio frequency tag chip power adaptive;
Fig. 7 is an application example synoptic diagram of the present invention.
Number in the figure: 1 is reader, and 2 is communications protocol, and 3 is radio-frequency (RF) tag, 21 is folded dipole antenna, and 22 is the outer matching network of sheet, and 23 is the power adaptive module, 24 is the bridge rectifier module, and 25 is the power supply generation module, and 26 are acceptance/sending module, 27 is the digital baseband control module, 31 is the supply voltage quantization modules, and 32 is frequency discrimination phase demodulation module, and 33 is low-pass filtering module, 34 is voltage-controlled concussion module, 35 is the 1:n frequency divider, and 36 is frequency divider, and 37 is sampling module, 41 is comparer, 42 is resistance, and 51 is code translator, and 52 is 1 frequency divider, 53 is 2 frequency dividers, and 54 is the n frequency divider.
Embodiment
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
Fig. 2 is an auto-adjusting circuit structural drawing in radio frequency tag chip and the sheet outside antenna impedance matching sheet; As shown in the figure, comprise antenna 21, outer matching network 22 of sheet and radio frequency tag chip, wherein radio frequency tag chip comprises again, bridge rectifier module 24, power supply generation module 25, reception/sending module 26, digital baseband control module 27 and power adaptive clock module 23.
Power adaptive clock module 23 wherein comprises supply voltage quantization modules 31, phase frequency detector 32, low-pass filtering 33, voltage controlled oscillator 34,1:n frequency divider 35, frequency divider 36 and sampling module 37 compositions as shown in Figure 3.
Because not charged source on the chip, above-mentioned power supply are the energy for chip operation in the label that RFID tag is recovered from radiofrequency signal by rectification module.When radio-frequency (RF) tag range reader distance is near, the voltage height that rectification goes out, when radio-frequency (RF) tag when reader distance is far away, the voltage that rectification goes out is low.The supply voltage quantization modules quantizes the power supply signal that the rectification of radio frequency tag chip front end produces, and produces an indicator signal according to voltage swing, can judge that by this signal the distance of label and reader is far and near.Phase frequency detector 32, low-pass filtering 33, voltage controlled oscillator 34, frequency divider 36 and sampling module 37 are formed the clock and data recovery module of a standard, and the data of serial input are carried out clock and data recovery.
The control signal decision that the 1:n frequency divider produces according to the supply voltage quantization modules outputs to the working clock frequency of digital baseband, can produce the different frequency divisions from 1 to n.
When supply voltage was low, care label card and reader distance were far away, adopt this moment the low rate clock and and reader between the communication of employing low-rate data, label chip work power consumption is reduced, thus the raising tag recognition distance.When supply voltage was high, care label card and reader distance were nearer, adopt this moment the two-forty clock and and reader between adopt the High Data Rate communication, be identified the time thereby reduce label.Because the supply voltage after the rectification directly is proportional to the energy that label chip receives, can getable energy supply so predict chip by the supply voltage quantization modules.When energy was enough, the 1:n frequency divider was chosen little clock division with output two-forty clock, makes the chip digital baseband processing speed accelerate, and with the higher data return data.When energy was low, the 1:n frequency divider was chosen big clock division with output low rate clock, makes the chip digital baseband processing speed slow down, and with the lower data rate return data.Thereby make radio-frequency (RF) tag near in distance, obtain energy when high with very fast time response, in distance, obtain energy when low, with the long period response, obtain communication distance farthest thus.
The supply voltage quantization modules as shown in Figure 4, the supply voltage of input is compared with n varying level value after the normal voltage dividing potential drop, obtains the supply voltage indicator signal of n position.
The 1:n frequency divider is deciphered back control frequency division module to supply voltage quantization modules 31 clock of phaselocked loop output is carried out the n frequency division as shown in Figure 5, and the digital baseband control module 27 that offers the back level is used.
Fig. 6 becomes data transfer rate communication flow figure for radio frequency tag chip power adaptive among the present invention.
Reset earlier behind the chip power, then the supply voltage of 31 pairs of rectifier outputs of supply voltage quantization modules quantizes, produce a control signal according to voltage swing, set the divider ratio of 1:n frequency divider 35 then, serial input data to the reader input is handled, divider ratio according to 1:n frequency divider 35 carries out frequency division again, thus the communication speed of output label chip system work clock and decision return data.
Figure 7 shows that the application example of the present invention in the 915MHz radio-frequency (RF) tag, one of them radio-frequency (RF) tag is near from reader distance, and another radio-frequency (RF) tag is far away from reader distance.
In the present embodiment, the label chip internal clocking can switch at two states, and a kind of is 40k, and another kind is 640k.After radio-frequency (RF) tag enters into the radio frequency zone, voltage-controlled oscillator (VCO) will shake frequency control at 640K according to the defeated next modulation signal of base band.The power adaptive clock module voltage that rectification is come out to prime of label chip inside quantizes, voltage after the quantification is compared with reference voltage V t (1.5v), if the voltage after the rectification greater than Vt (1.5v), illustrates that energy is enough, then exporting indicator signal is 1; If the voltage after the rectification less than Vt (1.5v), illustrates that energy is not enough, then Shu Chu indicator signal is 0.Allocator module is carried out frequency division according to indicator signal to the output clock of voltage-controlled oscillator (VCO), if indicator signal is 1, frequency division is not directly exported, and makes the chip digital baseband processing speed accelerate, and with the higher data return data; If indicator signal is 0, then carry out 16 frequency divisions, make the chip digital baseband processing speed slow down, and with the lower data rate return data, the clock behind the frequency division use for label chip internal digital base band.
By this method, in the time of radio-frequency (RF) tag range reader close together, the label inside chip adopts the clock of 640k to carry out work, adopts the 640k data transfer rate to carry out communication with reader, thereby reduces the time of identification; When radio-frequency (RF) tag range reader distance was far away, the label inside chip adopted the clock of 40k to carry out work, and adopted the 40k data transfer rate to carry out communication with reader, thereby reduced label card inside chip power consumption and strengthen the distance of identification.
When voltage is compared with reference voltage after the rectification,, obtain a control signal if frequency division is not directly compared with reference voltage; If n level value after the rectification after voltage and the reference voltage dividing potential drop is relatively, then obtain the control signal of n position, select corresponding divider ratio according to the size of control signal this moment.
In the present invention, radio frequency identification label chip is taked different system clocks, with decipherment distance and the recognition rate optimum that reaches radio-frequency (RF) identification automatically according to the energy size that receives.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1, a kind of power adaptive that is used for radio-frequency (RF) identification becomes the data transfer rate communication device, it is characterized in that, at least comprise: antenna (21), outer matching network (22) of sheet and radio frequency tag chip, wherein radio frequency tag chip comprises again: bridge rectifier module (24), power supply generation module (25), reception/sending module (26), digital baseband control module (27) and power adaptive clock module (23); Antenna (21) is connected with radio frequency tag chip by encapsulation with matching network (22); In radio frequency tag chip inside, the signal of matching network end input is sent into bridge rectifier module (24), reception/sending module (26) and power adaptive clock module (23) outside chip, bridge rectifier module (24) produces direct supply and gives digital baseband control module (27) chip in and power adaptive clock module (23) as power supply through power supply generation module (25) by rectification, and power adaptive clock module (23) is according to the different self-adaptation clock of signal data signaling rate generation of input.
2, the power adaptive that is used for radio-frequency (RF) identification according to claim 1 becomes the data transfer rate communication device, it is characterized in that, power adaptive clock module (23) is by supply voltage quantization modules (31), frequency discrimination phase demodulation module (32), low-pass filtering module (33), voltage controlled oscillator (34), 1:n frequency divider (35), frequency divider (36) and sampling module (37) are formed, wherein supply voltage quantizer (31) links to each other by n position supply voltage indicator signal with 1:n frequency divider (35), frequency discrimination phase demodulation module (32) is carried out bit comparison mutually with the signal of serial data and frequency divider (36) output of input, by low-pass filtering module (33) to voltage-controlled oscillator (VCO) (34) thus the control voltage input sample frequency that obtains sampling module (37) input serial data sampled and realize the data recovery; Voltage controlled oscillator (34) produces the input comparison clock of phase frequency detector (32) and the work clock of the interior digital baseband of sheet with frequency divider (36) and 1:n frequency divider simultaneously.
3, the power adaptive that is used for radio-frequency (RF) identification according to claim 2 becomes the data transfer rate communication device, it is characterized in that, the network that described supply voltage quantization modules (31) is made up of resistance and comparer, the supply voltage of input is compared with n varying level value after the normal voltage dividing potential drop, obtains the supply voltage indicator signal of n position.
4, a kind of power adaptive that is used for radio-frequency (RF) identification becomes the data transfer rate means of communication, it is characterized in that, comprises the steps: at least
Reset earlier behind the current chip power, then supply voltage quantization modules (31) quantizes the supply voltage of rectifier output, produce a control signal according to voltage swing, set the divider ratio of 1:n frequency divider (35) then, divider ratio according to 1:n frequency divider (35) carries out frequency division again, thereby the communication speed of output label chip system work clock and decision return data is monitored next chip then and is continued circulation, until all chip traversals.
5, the power adaptive that is used for radio-frequency (RF) identification according to claim 4 becomes the data transfer rate means of communication, it is characterized in that, comprises that also the input serial data to reader carries out clock and data recovery, and its data transfer rate is locked.
6, the power adaptive that is used for radio-frequency (RF) identification according to claim 4 becomes the data transfer rate means of communication, it is characterized in that, according to the divider ratio decision output label chip system work clock of 1:n frequency divider (35) and the communication speed of return data, when energy is enough, the 1:n frequency divider is chosen little clock division with output two-forty clock, make the chip digital baseband processing speed accelerate, and with the higher data return data; When energy was low, the 1:n frequency divider was chosen big clock division with output low rate clock, makes the chip digital baseband processing speed slow down, and with the lower data rate return data.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426899C (en) * | 2005-09-13 | 2008-10-15 | 华为技术有限公司 | Apparatus and method for regulating interface transmission rate of transmission device |
| CN101196978B (en) * | 2006-12-05 | 2010-09-15 | 财团法人工业技术研究院 | Method and system for reading RFID tags |
| CN101727601B (en) * | 2008-11-03 | 2011-10-26 | 上海复旦微电子股份有限公司 | Radio frequency identification tag and method for calibrating clock signals |
| CN104063787A (en) * | 2014-07-01 | 2014-09-24 | 成都联星微电子有限公司 | Mobile payment system based on radio frequency identification (RFID) |
| CN104796017A (en) * | 2015-04-22 | 2015-07-22 | 西安电子科技大学 | Frequency-adaptive radio frequency energy rectifier |
| CN106063168A (en) * | 2013-11-18 | 2016-10-26 | 菲尼萨公司 | Data serializer |
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN113285925A (en) * | 2021-04-25 | 2021-08-20 | 宁波圆芯电子有限公司 | Communication protocol based on low-cost flexible printed label |
| CN113543350A (en) * | 2021-03-30 | 2021-10-22 | 太原理工大学 | Rate self-adaption method based on frequency mapping |
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2004
- 2004-10-21 CN CN 200410067341 patent/CN1288589C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426899C (en) * | 2005-09-13 | 2008-10-15 | 华为技术有限公司 | Apparatus and method for regulating interface transmission rate of transmission device |
| CN101196978B (en) * | 2006-12-05 | 2010-09-15 | 财团法人工业技术研究院 | Method and system for reading RFID tags |
| CN101727601B (en) * | 2008-11-03 | 2011-10-26 | 上海复旦微电子股份有限公司 | Radio frequency identification tag and method for calibrating clock signals |
| CN106063168A (en) * | 2013-11-18 | 2016-10-26 | 菲尼萨公司 | Data serializer |
| US10129016B2 (en) | 2013-11-18 | 2018-11-13 | Finisar Corporation | Data serializer |
| CN104063787A (en) * | 2014-07-01 | 2014-09-24 | 成都联星微电子有限公司 | Mobile payment system based on radio frequency identification (RFID) |
| CN104796017A (en) * | 2015-04-22 | 2015-07-22 | 西安电子科技大学 | Frequency-adaptive radio frequency energy rectifier |
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN108413991B (en) * | 2018-02-12 | 2020-11-06 | 深圳市建讯电子有限公司 | Method and device for detecting proximity of metal coil/plate in electromagnetic wave transmission process |
| CN113543350A (en) * | 2021-03-30 | 2021-10-22 | 太原理工大学 | Rate self-adaption method based on frequency mapping |
| CN113285925A (en) * | 2021-04-25 | 2021-08-20 | 宁波圆芯电子有限公司 | Communication protocol based on low-cost flexible printed label |
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