CN107491707A - A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit - Google Patents
A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit Download PDFInfo
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- CN107491707A CN107491707A CN201610413314.3A CN201610413314A CN107491707A CN 107491707 A CN107491707 A CN 107491707A CN 201610413314 A CN201610413314 A CN 201610413314A CN 107491707 A CN107491707 A CN 107491707A
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- rfid
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- frequency identification
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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
- G06K7/10019—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
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Abstract
A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit, suitable for RF application.Radio circuit is made up of read write line sending module circuit and reader receiving block circuit.Wherein, sending module includes controllable attenuation power amplifier, power amplifier；Reader receiving block includes low-noise amplifier, mixer.Circuit structure is compact, and area occupied is small, can be identified over long distances, and working stability, and adaptability is good, improves operating efficiency, reduces that circuit power consumption is low, has good anti-interference and reliability.
Description
Art
The present invention relates to a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit, suitable for RF application.
Background technology
RFID is REID (Radio Frequency Identification) abbreviation, and it is 20th century oo
Age starts a kind of automatic identification technology risen, and RFID technique is one and passes through Space Coupling (alternation magnetic using radiofrequency signal
Field or electromagnetic field) realize contactless information transmission and pass through the technology that transmitted information reaches identifying purpose.
With now widely used automatic identification technology such as image, bar code, magnetic card, IC-card compared with, radio frequency identification skill
Art has many outstanding advantages:(1) when Touchless manipulation, identifying (several centimetres to tens meters) over long distances, therefore completing identification work
Without manual intervention;(2) without mechanical wear, long lifespan, good is environment resistant；(3) it can recognize that high-speed moving object and can be same
When identify multiple electronic tags;(4) read write line has the physical interface not opened to end user directly, ensures the peace of its own
Quan Xing;(5) for secure data area in addition to the cryptoguard of electronic tag, data division can realize safety management with some algorithms;
(6) process being mutually authenticated between read write line and label be present, realize secure communication and storage.
At present, the price of long range radio-frequency recognition system is also expensive, thus find improve its reading/writing distance method it is very heavy
Will.The factor for influenceing RF Signal distance is sensitive including operating frequency of antenna, the power output of read write line, the reception of read write line
Degree, the Q values of the power consumption of radio-frequency card, antenna and resonance circuit, antenna direction, the degree of coupling of read write line and radio-frequency card, and radio frequency
The energy and send energy of information etc. that card obtains in itself.The reading distance and write-in distance of most systems are different, are write
It is about read distance 40%~80% to enter distance.
The content of the invention
The present invention provides a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit, and circuit structure is compact, and area occupied is small, Ke Yichang
Distance is identified, and working stability, and adaptability is good, improves operating efficiency, reduces that circuit power consumption is low, has good anti-
Interference and reliability.
The technical solution adopted in the present invention is：
Ultrahigh frequency radio frequency identification (RFID) reader radio circuit is made up of read write line sending module circuit and reader receiving block circuit.Its
In, sending module includes controllable attenuation power amplifier, power amplifier；Reader receiving block include low-noise amplifier,
Mixer.
The controllable attenuation power amplifier selects acp chips of the RF2878 as controllable attenuation power amplifier, its
Input/output port adds impedance matching circuit, and it is 50 ohm to make the characteristic impedance of radiofrequency signal input and output port.
RF2878 chip VPD pins connect base-band input signal (by information sequences of the DSP/ARM after encoded).Adding some must can not
Few shunt capacitance.
In the power amplifier peripheral circuit, radiofrequency signal after the output amplification of RF2132 pins 10,11, output circuit
Impedance circuit need to be passed through and carry out impedance matching.In circuit debugging, match circuit device value should be adjusted according to actual requirement, make work(
It is minimum (output impedance is close to 50 ohm) to put output end VSWR.Because power amplifier output power is high, therefore it is produced to dc source
Raw a large amount of High-frequency Interferences.Therefore RF2132 power ports connect decoupling inductor and shunt capacitance, its purpose is exactly to remove in direct current signal
High-frequency signal, so as to improve the service behaviour of chip.
The MAX2640 of the low-noise amplifier selection MAXIM companies, MAX2640 is cheap and ultra-low noise small letter
Number power amplifier, is mainly used in cellular mobile communication, PCS, GPS and 2.4G ISM bands.Rf inputs and output end
Impedance matching network is connected to, debugging matching network is so that obtain desired gain, noise coefficient and return loss.To reduce chip
Peripheral components number, inductance can be replaced with microstrip line in circuit.
The reception system of the mixer uses binary channels zero-if architecture, and frequency mixer uses lower mixing, frequency mixer
Local oscillator port and prevention at radio-frequency port frequency requirement due to being that zero intermediate frequency receives, therefore require that intermediate frequency mouth exports in 902MHz~928MHz
Signal frequency minimum arrives direct current signal；Due to direct current offset noise in zero intermediate frequency system be present, each interport isolation of frequency mixer should
It is sufficiently large, reduce frequency mixer as far as possible from leakage signal；Frequency mixer should have high frequency conversion compression point and third order intermodulation point.
MC13143D is the high compression linear mixer of single-ended RF inputs, difference IF outputs and difference LO inputs, and its power only has 1.8m
The input impedance of W and RF ends is 50 ohm.MC13143D mixer outputs mouth exports for difference IF.For the double terminal conversions of difference
Into unit/terminal, from the T16-6T impedance transformers of Mini-Circuits companies.T16-6T frequency range be 0.03~
75MHz, low insertion loss.Output port impedance matching can either be realized, and can enough eliminates straight caused by zero intermediate frequency reception system
Flow deviation.Each port of frequency mixer has all carried out effective impedance matching.
The beneficial effects of the invention are as follows：Circuit structure is compact, and area occupied is small, can be identified over long distances, and works
Stable, adaptability is good, improves operating efficiency, reduces that circuit power consumption is low, has good anti-interference and reliability.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the controllable attenuation power amplifier of the present invention.
Fig. 2 is the power amplifier of the present invention.
Fig. 3 is the low-noise amplifier of the present invention.
Fig. 4 is the mixer of the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Such as Fig. 1, controllable attenuation power amplifier selects acp chips of the RF2878 as controllable attenuation power amplifier,
Its input/output port adds impedance matching circuit, and it is 50 ohm to make the characteristic impedance of radiofrequency signal input and output port.
RF2878 chip VPD pins connect base-band input signal (by information sequences of the DSP/ARM after encoded).Adding some must can not
Few shunt capacitance.
Such as Fig. 2, in power amplifier peripheral circuit, radiofrequency signal after the output amplification of RF2132 pins 10,11, output electricity
Road need to pass through impedance circuit and carry out impedance matching.In circuit debugging, match circuit device value should be adjusted according to actual requirement, made
Power amplifier output end VSWR minimums (output impedance is close to 50 ohm).Because power amplifier output power is high, therefore it is to dc source
Produce a large amount of High-frequency Interferences.Therefore RF2132 power ports connect decoupling inductor and shunt capacitance, its purpose is exactly to remove direct current signal
In high-frequency signal, so as to improve the service behaviour of chip.
Such as Fig. 3, the MAX2640 of low-noise amplifier selection MAXIM companies, MAX2640 is cheap and ultra-low noise small
Signal power amplifier, it is mainly used in cellular mobile communication, PCS, GPS and 2.4G ISM bands.Rf inputs and output
Impedance matching network is terminated with, debugging matching network is so that obtain desired gain, noise coefficient and return loss.To reduce core
Piece peripheral components number, inductance can be replaced with microstrip line in circuit.
Such as Fig. 4, the reception system of mixer uses binary channels zero-if architecture, and frequency mixer uses lower mixing, mixing
Device local oscillator port and prevention at radio-frequency port frequency requirement due to being that zero intermediate frequency receives, therefore require that intermediate frequency mouth is defeated in 902MHz~928MHz
Go out signal frequency minimum and arrive direct current signal；Due to direct current offset noise, each interport isolation of frequency mixer in zero intermediate frequency system be present
It is sufficiently large, reduces frequency mixer as far as possible from leakage signal；Frequency mixer should have high frequency conversion compression point and third order intermodulation point.
MC13143D is the high compression linear mixer of single-ended RF inputs, difference IF outputs and difference LO inputs, and its power only has 1.8m
The input impedance of W and RF ends is 50 ohm.MC13143D mixer outputs mouth exports for difference IF.For the double terminal conversions of difference
Into unit/terminal, from the T16-6T impedance transformers of Mini-Circuits companies.T16-6T frequency range be 0.03~
75MHz, low insertion loss.Output port impedance matching can either be realized, and can enough eliminates straight caused by zero intermediate frequency reception system
Flow deviation.Each port of frequency mixer has all carried out effective impedance matching.
Claims (9)
1. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit, it is characterized in that：Described radio circuit is by read write line sending module electricity
Road and reader receiving block circuit composition.
2. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The sending module bag
Include controllable attenuation power amplifier, power amplifier.
3. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：Described read write line connects
Receiving module includes low-noise amplifier, mixer, and reader receiving block includes low-noise amplifier, mixer.
4. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：Described controllable attenuation
Power amplifier selects acp chips of the RF2878 as controllable attenuation power amplifier, and its input/output port adds resistance
Anti- match circuit, it is 50 ohm to make the characteristic impedance of radiofrequency signal input and output port.
5. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The power amplifier
In peripheral circuit, radiofrequency signal after the output amplification of RF2132 pins 10,11, output circuit need to pass through impedance circuit and carry out impedance
Matching.
6. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The power amplifier
In circuit, RF2132 power ports connect decoupling inductor and shunt capacitance, the high-frequency signal in direct current signal are removed, so as to improve core
The service behaviour of piece.
7. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The low noise amplification
The MAX2640 of device selection MAXIM companies, rf inputs and output are terminated with impedance matching network.
8. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The mixer
Reception system use binary channels zero-if architecture, frequency mixer uses lower mixing.
9. a kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit according to claim 1, it is characterized in that：The mixer
In, MC13143D is the high compression linear mixer of single-ended RF inputs, difference IF outputs and difference LO inputs, and output port is poor
Divide IF outputs, be that the double terminals of difference are converted into unit/terminal, from the T16-6T impedance transformers of Mini-Circuits companies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610413314.3A CN107491707A (en) | 2016-06-13 | 2016-06-13 | A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610413314.3A CN107491707A (en) | 2016-06-13 | 2016-06-13 | A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit |
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| Publication Number | Publication Date |
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| CN107491707A true CN107491707A (en) | 2017-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610413314.3A Pending CN107491707A (en) | 2016-06-13 | 2016-06-13 | A kind of ultrahigh frequency radio frequency identification (RFID) reader radio circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787660A (en) * | 2019-03-20 | 2019-05-21 | 上海诺潇智能科技有限公司 | A kind of base band signal producing means of RFID transmit circuit |
-
2016
- 2016-06-13 CN CN201610413314.3A patent/CN107491707A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787660A (en) * | 2019-03-20 | 2019-05-21 | 上海诺潇智能科技有限公司 | A kind of base band signal producing means of RFID transmit circuit |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171219 |
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| WD01 | Invention patent application deemed withdrawn after publication |