CN109299626A - A kind of RFID card reader R-T unit and system - Google Patents

A kind of RFID card reader R-T unit and system Download PDF

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Publication number
CN109299626A
CN109299626A CN201811271687.7A CN201811271687A CN109299626A CN 109299626 A CN109299626 A CN 109299626A CN 201811271687 A CN201811271687 A CN 201811271687A CN 109299626 A CN109299626 A CN 109299626A
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capacitor
card reader
diode
inductor
filter
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CN109299626B (en
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丁天威
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • 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
    • G06K17/0029—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 the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Toxicology (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

A kind of RFID card reader R-T unit and system, card reader chip are equipped with differential transmission node TX1, differential transmission node TX2 and receiving node RX, and the receiving end of receiving node RX is connected with resistance RRX, resistance RRXInput terminal pass through VCombEnd is connected with capacitor CRX‑nWith capacitor CRX_p, capacitor CRX_nWith capacitor CRX_pOutput end converge to VCombEnd.Card reader chip is configured with transmitter and receiver in receive-transmit system, transmitter is connected with differential power amplifier, differential power amplifier is connected with matching network unit, matching network unit is connected with carrier cancellation frequency mixer and radio-frequency antenna, carrier cancellation frequency mixer is connected with baseband filter, baseband filter connects receiver, and treated that data are sent to receiver by noise filtering for baseband filter.The present invention reduces the interference of carrier wave ripple, Differential Output and reception load, improves the sensitivity of receiver.

Description

A kind of RFID card reader R-T unit and system
Technical field
The present invention relates to technical field of near field communication, and in particular to a kind of RFID card reader R-T unit and system.
Background technique
RFID (Radio Frequency Identification) is the english abbreviation of radio frequency identification, generally, RFID card reader is a kind of automatic identification equipment of energy read electronic label data.It is divided into according to the difference of label reading frequency low Frequently, high frequency, hyperfrequency card reader.RFID card reader, which need to be equipped with RFID antenna and be used together, could read label information.RFID is penetrated Frequency identification by radiofrequency signal automatic identification target object and obtains dependency number as a kind of contactless automatic identification technology According to identification work is operable with various adverse circumstances without manual intervention.RFID technique can recognize high-speed moving object and can be same When identify multiple labels, it is swift and convenient to operate.
Accenture laboratory chief scientist's Cathy Ferguson thinks that RFID is a kind of breakthrough technology: " first, it can identify Single very specific object, rather than slice shape code can only identify a type objects like that；Second, use radio to penetrate Frequently, data can be read through exterior material, and bar code must read information by laser；Third, can be simultaneously to multiple Object is distinguished, and bar code can only singly be read.In addition, the information content of storage is also very big ".
Mainstream card reading communication be a kind of short distance high frequency radio technology, 13.56MHz frequency work in 10 centimetres away from From interior.Its transmission speed has 106Kbit/ seconds, 212Kbit/ seconds or 424Kbit/ seconds etc..The basic functional principle of RFID technique It is after the tag enters the magnetic field, to receive the radiofrequency signal that plug-in reader issues, send out storage by induced current energy obtained Product information (Passive Tag, passive label or passive tag) in the chips is sent after plug-in reader reads information and decodes Related data processing is carried out to Central Information System.The quick emergence of radio RF recognition technology (RFID) is both technology development As a result, and application demand embodiment.Since the 1990s, around the various applications of RFID as emerging rapidly in large numbersBamboo shoots after a spring rain As emerge in multitude out.In all RFID products, the technology content of card reader is highest because it be semiconductor technology, The set of the multiple technologies such as radio-frequency technique, efficient decoding algorithm.
At this stage, since card reader needs to carry transmission power to provide enough energy to passive label, while it is micro- to receive card Weak reaction signal, the transmission power and receiver sensitivity of card reader require it is relatively high, especially in specific use once The case where it is small require big card reading apart from when, card reader distance and transmission power and receiver sensitivity performance are not Linear to improve, it is required that exponential other raising, traditional RFID card reader is because of the big limitation receiver spirit of carrier signal interference The reading/writing distance of sensitivity, card reader is shorter, and the carrier signal for emitting itself sending be easy to cause interference to receiver itself.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of RFID card reader R-T unit and system, solves tradition RFID reading Card device because carrier signal interference is big and the problem of limit receiver sensitivity, can effectively improve the read-write of card reader away from From realization card reading distance reaches the minimum power reaction operating distance of RFID.
To achieve the above object, the embodiment of the present invention provides a kind of RFID card reader R-T unit, the R-T unit packet Card reader chip is included, the card reader chip is equipped with differential transmission node TX1, differential transmission node TX2 and receiving node RX, The receiving end of the receiving node RX is connected with resistance RRX, the resistance RRXInput terminal pass through VCombEnd is connected with capacitor CRX-n With capacitor CRX_p, the capacitor CRX_nWith capacitor CRX_pOutput end converge to the VCombEnd.
As the preferred embodiment of RFID card reader R-T unit, the card reader chip is equipped with Bias node, the resistance RRXBiasing resistor R is equipped between the Bias nodebias, the biasing resistor RbiasIt is parallel with shunt capacitance Cbias。
As the preferred embodiment of RFID card reader R-T unit, the differential transmission node TX1 is connected with inductor LEMC1, The inductor LEMC1It is connected with diode DP, the diode DPIt is connected with capacitor CRX_p, the capacitor CRX_pWith diode DP Between be parallel with filter resistance RFILT_pWith filter capacitor CFILT_p。
As the preferred embodiment of RFID card reader R-T unit, the differential transmission node TX2 is connected with inductor LEMC2, The inductor LEMC2It is connected with diode DN, the diode DNIt is connected with capacitor CRX_n, the capacitor CRX_nWith diode DN Between be parallel with filter resistance RFILT_nWith filter capacitor CFILT_n。
As the preferred embodiment of RFID card reader R-T unit, inductor LEMC1With inductor LEMC2Between be in series with coupling Capacitor CEMC1And coupled capacitor CEMC2。
As the preferred embodiment of RFID card reader R-T unit, the inductor LEMC1With inductor LEMC2It is connected with jointly One balun/transformer, balun/transformer are connected with antenna circuit.
As the preferred embodiment of RFID card reader R-T unit, the inductor LEMC1With inductor LEMC2It is connected with jointly Transmission line, the transmission line are connected with a balun/transformer, and balun/transformer is connected with antenna circuit.
The embodiment of the present invention also provides a kind of RFID card reader receive-transmit system, and the receive-transmit system includes that above-mentioned RFID is read Card device R-T unit, RFID card reader R-T unit are equipped with card reader chip, and the card reader chip is configured with transmitter and connects Receipts machine, the transmitter emit data for card reader chip, and transmitter is connected with differential power amplifier, differential power amplification The data that device is used to emit transmitter carry out differential amplification processing, and the differential power amplifier is connected with matching network list Member, the matching network unit are connected with carrier cancellation frequency mixer and radio-frequency antenna, and the carrier cancellation frequency mixer is connected with base Band filter, carrier cancellation frequency mixer are used to carry out at mixing the signal that the received radiofrequency signal of radio-frequency antenna and local oscillator generate Reason, the baseband filter are used to carry out the data after Frequency mixing processing noise filtering processing, and the baseband filter connects institute State receiver, treated that data are sent to receiver by noise filtering for baseband filter.
As the preferred embodiment of RFID card reader receive-transmit system, the transmitter is configured with differential transmission node TX1 and difference Transmitting node TX2, the differential transmission node TX1 is divided to be connected with inductor LEMC1, the inductor LEMC1It is connected with diode DP, the diode DPIt is connected with capacitor CRX_p, the capacitor CRX_pWith diode DPBetween be parallel with filter resistance RFILT_pAnd filter Wave capacitor CFILT_p；
The differential transmission node TX2 is connected with inductor LEMC2, the inductor LEMC2It is connected with diode DN, described Diode DNIt is connected with capacitor CRX_n, the capacitor CRX_nWith diode DNBetween be parallel with filter resistance RFILT_nAnd filter capacitor CFILT_n。
As the preferred embodiment of RFID card reader receive-transmit system, the receiver is furnished with receiving node RX, the reception section The receiving end of point RX is connected with resistance RRX, the resistance RRXInput terminal pass through VCombEnd is connected with capacitor CRX-nAnd capacitor CRX_p, the capacitor CRX_nWith capacitor CRX_pOutput end converge to the VCombEnd.
The embodiment of the present invention, which has the advantages that, makes full use of differential signal, for same transceiving chip, substantially increases The reading sensitivity and reading distance of card reader solve traditional RFID card reader because carrier signal interference limits receiver greatly The problem of sensitivity, the reading/writing distance of card reader can be effectively improved, the minimum power that realization card reading distance reaches RFID is anti- Operating distance is answered, the interference of carrier wave ripple is reduced, balances output and received load, the ripple frequency of detection is increased one Times, it is more easier to be filtered out by next stage baseband amplifier, improves the sensitivity of receiver.
Detailed description of the invention
Fig. 1 is the RFID card reader R-T unit schematic diagram provided in the embodiment of the present invention；
Fig. 2 is the RFID card reader R-T unit schematic diagram provided in another embodiment of the present invention；
Fig. 3 is the RFID card reader receive-transmit system schematic diagram provided in the embodiment of the present invention；
Fig. 4 uses the simulated effect contrast schematic diagram of technical solution of the present invention and conventional solution；
In figure: 1, card reader chip；2, transmitter；3, receiver；4, differential power amplifier；5, matching network unit； 6, carrier cancellation frequency mixer；7, radio-frequency antenna；8, baseband filter；9, balun/transformer；10, transmission line；11, antenna circuit.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation Content disclosed by book is understood other advantages and efficacy of the present invention easily.
It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification to be taken off The content shown is not intended to limit the invention enforceable qualifications so that those skilled in the art understands and reads, therefore Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the present invention Under the effect of can be generated and the purpose that can reach, it should all still fall in disclosed technology contents and obtain the model that can cover In enclosing.Meanwhile cited such as "upper", "lower", " left side ", the right side in this specification ", the term of " centre ", be merely convenient to chat That states is illustrated, rather than to limit the scope of the invention, relativeness is altered or modified, and is changing skill without essence It is held in art, when being also considered as the enforceable scope of the present invention.
Referring to Fig. 1 and Fig. 2, a kind of RFID card reader R-T unit, R-T unit include card reader chip 1, card reader core Piece 1 is equipped with differential transmission node TX1, differential transmission node TX2 and receiving node RX, and the receiving end of receiving node RX is connected with Resistance RRX, resistance RRXInput terminal pass through VCombEnd is connected with capacitor CRX-nWith capacitor CRX_p, capacitor CRX_nWith capacitor CRX_pIt is defeated Outlet converges to VCombEnd.
In one embodiment of RFID card reader R-T unit, card reader chip 1 is equipped with Bias node, resistance RRXWith Bias Biasing resistor R is equipped between nodebias, biasing resistor RbiasIt is parallel with shunt capacitance Cbias.Bias node is straight for realizing input Stream biasing, the technical program pass through CbiasAnd RbiasLow-pass filter is realized together to further filter out ripple interference, when main When interference is 2 overtones band of main carrier, the identical available additional 6dB of filter circuit inhibits.
In one embodiment of RFID card reader R-T unit, differential transmission node TX1 is connected with inductor LEMC1, inductance Device LEMC1It is connected with diode DP, diode DPIt is connected with capacitor CRX_p, capacitor CRX_pWith diode DPBetween be parallel with filtered electrical Hinder RFILT_pWith filter capacitor CFILT_p.Differential transmission node TX2 is connected with inductor LEMC2, inductor LEMC2It is connected with diode DN, diode DNIt is connected with capacitor CRX_n, capacitor CRX_nWith diode DNBetween be parallel with filter resistance RFILT_nAnd filter capacitor CFILT_n.Inductor LEMC1With inductor LEMC2Between be in series with coupled capacitor CEMC1And coupled capacitor CEMC2。
In one embodiment of RFID card reader R-T unit, inductor LEMC1With inductor LEMC2It is connected with one jointly Balun/transformer 9, balun/transformer 9 are connected with antenna circuit 11, can also use inductor LEMC1With inductor LEMC2Jointly It is connected with transmission line 10, transmission line 10 is connected with a balun/transformer 9, and balun/transformer 9 is connected with antenna circuit 11.Bar Human relations (balun) are a kind of three port devices, are a kind of to be converted to difference output by that will match to input and realize balanced transmission line The wide band radio-frequency line transformer being connect between circuit and unbalanced line circuit.Due to balanced circuit and unbalanced line Road has different electrical characteristics, cannot simply be connected with each other.Balun/transformer is turned by providing impedance for two kinds of different routes It changes and is matched, make system that there are different impedances or compatible with difference/single-ended signaling.
Referring to Fig. 3, the embodiment of the present invention also provides a kind of RFID card reader receive-transmit system, and receive-transmit system includes card reader core Piece 1, card reader chip 1 are configured with transmitter 2 and receiver 3, and transmitter 2 emits data, transmitter 2 for card reader chip 1 It is connected with differential power amplifier 4, the data that differential power amplifier 4 is used to emit transmitter 2 carry out differential amplification processing, Differential power amplifier 4 is connected with matching network unit 5, and matching network unit 5 is connected with carrier cancellation frequency mixer 6 and radio frequency day Line 7, carrier cancellation frequency mixer 6 are connected with baseband filter 8, and carrier cancellation frequency mixer 6 is used for the received radio frequency of radio-frequency antenna 7 The signal that signal and local oscillator generate carries out Frequency mixing processing, and baseband filter 8 is used to carry out noise filter to the data after Frequency mixing processing Wave processing, baseband filter 8 connect receiver 3, and treated that data are sent to receiver 3 by noise filtering for baseband filter 8.
Referring again to Fig. 1 and Fig. 2, in one embodiment of RFID card reader receive-transmit system, transmitter 2 is sent out configured with difference Node TX1 and differential transmission node TX2 are penetrated, differential transmission node TX1 is connected with inductor LEMC1, inductor LEMC1It is connected with two Pole pipe DP, diode DPIt is connected with capacitor CRX_p, capacitor CRX_pWith diode DPBetween be parallel with filter resistance RFILT_pAnd filtered electrical Hold CFILT_p；Differential transmission node TX2 is connected with inductor LEMC2, inductor LEMC2It is connected with diode DN, diode DNConnection There is capacitor CRX_n, capacitor CRX_nWith diode DNBetween be parallel with filter resistance RFILT_nWith filter capacitor CFILT_n.Receiver 3 is matched There is receiving node RX, the receiving end of receiving node RX is connected with resistance RRX, resistance RRXInput terminal pass through VCombEnd is connected with electricity Hold CRX-nWith capacitor CRX_p, capacitor CRX_nWith capacitor CRX_pOutput end converge to VCombEnd.
Referring to fig. 4, the simulation result of lines X1 is the baseband signal that conventional solution is obtained by single detecting circuit, can To find out that baseband signal has very big carrier-in-interference, compared to X2 simulation result of the invention, amplitude is general 3 times big.Together Shi Fang great see the frequency component of carrier wave be also it is different, common detection is the bigger signal of a cycle, and of the invention dry It disturbs and has been greatly reduced by the cancelling out each other for differential signal of input, and dominant frequency component becomes 2 times of main carrier Frequency, it is farther from base-band signal frequency, it is more easier to be filtered out by next stage circuit.It is poor that the present invention provides single-ended reception circuit Divide the input of high frequency carrier detecting circuit signal, reduces the interference of carrier wave ripple, output and received load are balanced, by detection Ripple frequency increases one times, is more easier to be filtered out by next stage baseband amplifier, improves the sensitivity of receiver 3, additionally The ripple that 2 times of carrier frequencies are further filtered out by the small capacitances being connected in parallel on above biasing resistor, utilize 3 times of differential signal The ripple for reducing common detecting circuit improves the sensitivity of receiver 3.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore, These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.

Claims (10)

1. a kind of RFID card reader R-T unit, the R-T unit includes card reader chip (1), the card reader chip (1) It is equipped with differential transmission node TX1, differential transmission node TX2 and receiving node RX, it is characterised in that: the receiving node RX's Receiving end is connected with resistance RRX, the resistance RRXInput terminal pass through VCombEnd is connected with capacitor CRX-nWith capacitor CRX_p, described Capacitor CRX_nWith capacitor CRX_pOutput end converge to the VCombEnd.
2. a kind of RFID card reader R-T unit according to claim 1, it is characterised in that: the card reader chip (1) Equipped with Bias node, the resistance RRXBiasing resistor R is equipped between the Bias nodebias, the biasing resistor RbiasAnd It is associated with shunt capacitance Cbias。
3. a kind of RFID card reader R-T unit according to claim 1, it is characterised in that: the differential transmission node TX1 is connected with inductor LEMC1, the inductor LEMC1It is connected with diode DP, the diode DPIt is connected with capacitor CRX_p, institute State capacitor CRX_pWith diode DPBetween be parallel with filter resistance RFILT_pWith filter capacitor CFILT_p。
4. a kind of RFID card reader R-T unit according to claim 1, it is characterised in that: the differential transmission node TX2 is connected with inductor LEMC2, the inductor LEMC2It is connected with diode DN, the diode DNIt is connected with capacitor CRX_n, institute State capacitor CRX_nWith diode DNBetween be parallel with filter resistance RFILT_nWith filter capacitor CFILT_n。
5. a kind of RFID card reader R-T unit according to claim 3 or 4, it is characterised in that: inductor LEMC1And inductance Device LEMC2Between be in series with coupled capacitor CEMC1And coupled capacitor CEMC2。
6. a kind of RFID card reader R-T unit according to claim 5, it is characterised in that: the inductor LEMC1And electricity Sensor LEMC2It is connected with a balun/transformer (9) jointly, balun/transformer (9) is connected with antenna circuit (11).
7. a kind of RFID card reader R-T unit according to claim 5, it is characterised in that: the inductor LEMC1And electricity Sensor LEMC2It is connected with jointly transmission line (10), the transmission line (10) is connected with a balun/transformer (9), balun/transformation Device (9) is connected with antenna circuit (11).
8. a kind of RFID card reader receive-transmit system, the receive-transmit system includes transmitting-receiving as claimed in any one of claims 1 to 7 Device, the R-T unit include card reader chip (1), it is characterised in that: the card reader chip (1) is configured with transmitter (2) and receiver (3), the transmitter (2) emit data for card reader chip (1), and transmitter (2) is connected with differential power Amplifier (4), the data that differential power amplifier (4) is used to emit transmitter (2) carry out differential amplification processing, the difference Power amplifier (4) is connected with matching network unit (5), and the matching network unit (5) is connected with carrier cancellation frequency mixer (6) With radio-frequency antenna (7), the carrier cancellation frequency mixer (6) is connected with baseband filter (8), and carrier cancellation frequency mixer (6) is used for The signal generated to the received radiofrequency signal of radio-frequency antenna (7) and local oscillator carries out Frequency mixing processing, and the baseband filter (8) is used for Noise filtering processing is carried out to the data after Frequency mixing processing, the baseband filter (8) connects the receiver (3), base band filter Treated that data are sent to receiver (3) by noise filtering for wave device (8).
9. a kind of RFID card reader receive-transmit system according to claim 8, it is characterised in that: transmitter (2) configuration There are differential transmission node TX1 and differential transmission node TX2, the differential transmission node TX1 to be connected with inductor LEMC1, the electricity Sensor LEMC1It is connected with diode DP, the diode DPIt is connected with capacitor CRX_p, the capacitor CRX_pWith diode DPBetween simultaneously It is associated with filter resistance RFILT_pWith filter capacitor CFILT_p；
The differential transmission node TX2 is connected with inductor LEMC2, the inductor LEMC2It is connected with diode DN, two pole Pipe DNIt is connected with capacitor CRX_n, the capacitor CRX_nWith diode DNBetween be parallel with filter resistance RFILT_nAnd filter capacitor CFILT_n。
10. a kind of RFID card reader receive-transmit system according to claim 8, it is characterised in that: the receiver (3) is furnished with Receiving node RX, the receiving end of the receiving node RX are connected with resistance RRX, the resistance RRXInput terminal pass through VCombEnd connects It is connected to capacitor CRX-nWith capacitor CRX_p, the capacitor CRX_nWith capacitor CRX_pOutput end converge to the VCombEnd.
CN201811271687.7A 2018-10-29 2018-10-29 RFID card reader receiving and sending device and system Active CN109299626B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1707961A (en) * 2004-06-09 2005-12-14 鼎芯通讯（上海）有限公司 Zero intermediate frequency radio receiver second-order inter-modulation automatic correcting circuit
CN103546187A (en) * 2013-11-01 2014-01-29 东南大学 Radio frequency transceiver based on current reuse of same-phase branches I and orthogonal branches Q
CN105139049A (en) * 2015-08-25 2015-12-09 华东师范大学 Full-integration UHF-RFID reader-writer radio frequency reception front end circuit working in 860-960MHz
CN205232221U (en) * 2015-10-22 2016-05-11 北京芯联创展电子技术有限公司 Radio frequency front end device based on general radio frequency transceiving chip
CN108631800A (en) * 2018-05-09 2018-10-09 深圳市盛路物联通讯技术有限公司 Internet of Things low-power consumption radio circuit and terminal
CN108875436A (en) * 2018-04-20 2018-11-23 北京旷视科技有限公司 A kind of R-T unit and card reader

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1707961A (en) * 2004-06-09 2005-12-14 鼎芯通讯（上海）有限公司 Zero intermediate frequency radio receiver second-order inter-modulation automatic correcting circuit
CN103546187A (en) * 2013-11-01 2014-01-29 东南大学 Radio frequency transceiver based on current reuse of same-phase branches I and orthogonal branches Q
CN105139049A (en) * 2015-08-25 2015-12-09 华东师范大学 Full-integration UHF-RFID reader-writer radio frequency reception front end circuit working in 860-960MHz
CN205232221U (en) * 2015-10-22 2016-05-11 北京芯联创展电子技术有限公司 Radio frequency front end device based on general radio frequency transceiving chip
CN108875436A (en) * 2018-04-20 2018-11-23 北京旷视科技有限公司 A kind of R-T unit and card reader
CN108631800A (en) * 2018-05-09 2018-10-09 深圳市盛路物联通讯技术有限公司 Internet of Things low-power consumption radio circuit and terminal

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