CN206820750U - A kind of the near-field communication demodulator circuit and safety chip of rear end matching - Google Patents
A kind of the near-field communication demodulator circuit and safety chip of rear end matching Download PDFInfo
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- CN206820750U CN206820750U CN201720300729.XU CN201720300729U CN206820750U CN 206820750 U CN206820750 U CN 206820750U CN 201720300729 U CN201720300729 U CN 201720300729U CN 206820750 U CN206820750 U CN 206820750U
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- 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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Abstract
The utility model is applied to near-field communication field, there is provided and a kind of the near-field communication demodulator circuit and safety chip of rear end matching, the circuit are connected between near field antenna and processing unit, including：Rear end matching is carried out to the interface signal that the near field antenna receives, and it is sent to the rear end matching unit that the processing unit carries out back-end processing, the input of the rear end matching unit is connected with the near field antenna, and the output end of the rear end matching unit is connected with the processing unit.The utility model is built into the near-field communication demodulator circuit with backend arrangement using a small amount of discrete component, low in energy consumption, and debugging is simple, and the waveform of former modulation intelligence is extracted by way of comparing to determine, and easy and effective, cost is low.
Description
Technical field
The utility model belongs to near-field communication field, more particularly to the near-field communication demodulator circuit and peace of a kind of matching of rear end
Full chip.
Background technology
NFC (Near Field Communication, near-field communication technology) is a kind of radio communication of short distance high frequency
Technology, near-field communication is by as the international standards of ISO/IEC IS 18092, ECMA-340 standards and ETSI TS 102 at present
190 standards.NFC in the passive mode, starts the equipment of near-field communication, also referred to as using actively and passively two kinds of read modes
Initiating equipment (main equipment), radiofrequency field (RF-field) is provided in whole communication process.It can select a kind of transmission speed,
Transmit data to another equipment.Another equipment is referred to as target device (slave unit), it is not necessary to produces radiofrequency field, and uses negative
Modulation (load modulation) technology is carried, data is passed back initiating equipment, completes information exchange.
It is most of using NFC communication chip generally in the case where needing passive near field communication, but currently
NFC communication chip interacts complexity with external reader, and power consumption is larger, and rear end matching effect can not also meet customer need.
Utility model content
The purpose of the utility model embodiment is to provide a kind of near-field communication demodulator circuit of rear end matching, it is intended to solves
It is existing that the problem of circuit power consumption is big, cost is high, rear end matching effect difference is caused by the communication of marching into the arena of NFC communication chip.
The utility model embodiment is achieved in that a kind of near-field communication demodulator circuit of rear end matching, is connected near
Between field antenna and processing unit, the circuit is located at the tab end of near-field communication, and the circuit includes：
Rear end matching is carried out to the interface signal that the near field antenna receives, and is sent to the processing unit and carries out rear end
The rear end matching unit of processing, the input of the rear end matching unit are connected with the near field antenna, and the rear end matching is single
The output end of member is connected with the processing unit.
In said structure, the rear end matching unit includes：
Conversion is made decisions to the envelope waveform according to amplitude threshold, and is sent to the processing unit and carries out rear end
The comparison judgement unit of reason, the first input end of the relatively judgement unit is the input of the rear end matching unit, described
The output end for comparing judgement unit connects for the output end of the rear end matching unit and the first input and output of the processing unit
Mouth connection；
The amplitude threshold setting unit of the amplitude threshold is set, the input of the amplitude threshold setting unit with it is described
The second input/output interface connection of processing unit, the output end of the amplitude threshold setting unit judgement unit compared with described
The second input connection.
In said structure, the relatively judgement unit is comparator, and the positive input of the comparator is the comparison
The first input end of judgement unit, the reverse input end of the comparator connect for the second input of the relatively judgement unit
The amplitude threshold setting unit, the output end of the comparator connect the processing for the output end of the relatively judgement unit
Chip, the power end connection supply voltage of the comparator, the earth terminal ground connection of the comparator.
In said structure, the amplitude threshold setting unit includes：
Resistance R2 and resistance R3；
One end of the resistance R3 connects processing unit, the resistance R3 for the input of the amplitude threshold setting unit
The other end for the amplitude threshold setting unit output end connection it is described relatively judgement unit, the other end of the resistance R3
Also it is grounded by the resistance R2.
In said structure, the rear end matching unit is：
The envelope waveform is sampled by AD and carries out rear end matching, and the voltage amplitude value generation read according to sampling is adopted
Sample value is sent to the sampling unit that the processing unit carries out back-end processing, and the input of the sampling unit is the rear end
Input with unit, the output end of the sampling unit are the output end of the rear end matching unit.
In said structure, the sampling unit is analog-to-digital conversion module, and the analog input end of the analog-to-digital conversion module is
The input of the sampling unit, the digital output end of the analog-to-digital conversion module are the output end of the sampling unit.
In said structure, the circuit also includes：
Filter out the carrier wave in the modulated signal that the near field antenna receives, with retain the envelope waveform of modulation intelligence for
The detection unit of rear end matching, the input of the detection unit are connected with the near field antenna, the output of the detection unit
End is connected with the input of the rear end matching unit.
In said structure, the detection unit includes：
One-way conduction module and filtration module；
The input of the one-way conduction module connects the near field antenna, the list for the input of the detection unit
It is connected to the output end of conduction module with the input of the filtration module, the output end of the filtration module is the detection list
The output end of member connects the rear end matching unit.
In said structure, the detection unit also includes：
Resistance R4, one end of the resistance R4 are connected with the output end of the one-way conduction module, and the resistance R4's is another
One end is connected with the input of the filtration module.
In said structure, the circuit is realized by discrete device or the circuit is integrated in chip with the processing unit
In.
The another object of the utility model embodiment is, there is provided a kind of safety chip, the safety chip are integrated with
State the near-field communication demodulator circuit and processing unit of rear end matching.
The utility model embodiment is built into the near-field communication with backend arrangement using a small amount of discrete component and demodulates electricity
Road, low in energy consumption, debugging is simple, and the waveform of former modulation intelligence, easy and effective, cost are extracted by way of comparing to determine
It is low.
Brief description of the drawings
Fig. 1 is the structure chart of the near-field communication demodulator circuit for the rear end matching that the utility model embodiment provides；
Fig. 2 is the example of the near-field communication demodulator circuit for the comparison discriminate rear end matching that the utility model embodiment provides
Circuit diagram；
Fig. 3 is the exemplary circuit of the near-field communication demodulator circuit for the sampling type rear end matching that the utility model embodiment provides
Figure.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not form conflict each other, can is mutually combined.
The utility model embodiment is built into the near-field communication with backend arrangement using a small amount of discrete component and demodulates electricity
Road, low in energy consumption, debugging is simple, and the waveform of former modulation intelligence, easy and effective, cost are extracted by way of comparing to determine
It is low.
Fig. 1 shows the structure of the near-field communication demodulator circuit for the rear end matching that the utility model embodiment provides, in order to
It is easy to illustrate, illustrate only the part related to the utility model.
As the embodiment of the utility model one, the near-field communication demodulator circuit of rear end matching can apply to various near fields
In telecommunication circuit, it is particularly suitable for use near field communication tag, the near-field communication demodulator circuit of rear end matching is connected near field day
Between line 2 and processing unit MCU, including：
Rear end matching unit 10, the interface signal for being received near field antenna 2 carries out rear end matching, and is sent to processing
Unit MCU carries out back-end processing, and the input of rear end matching unit 10 is connected near field antenna 2, rear end matching unit 10 it is defeated
Go out end to be connected with processing unit MCU.
Illustrated below by way of specific embodiment.
Fig. 2 shows the near-field communication demodulator circuit for the comparison discriminate rear end matching that the utility model embodiment provides
Structure, for convenience of description, it illustrate only the part related to the utility model.
As the embodiment of the utility model one, the near-field communication demodulator circuit of rear end matching can also include：
Detection unit 11, the carrier wave in the modulated signal received for filtering out near field antenna 2, to retain modulation intelligence
Envelope waveform is matched for rear end, and the input of detection unit 11 is connected near field antenna 2；
Preferably, detection unit 11 includes：
One-way conduction module 111 and filtration module 112；
The input of one-way conduction module 111 be detection unit 11 input, the output end of one-way conduction module 111 with
The input connection of filtration module 112, the output end of filtration module 112 are the output end of detection unit 11.
More preferably, detection unit 11 can also include：
Resistance R4, resistance R4 one end are connected with the output end of one-way conduction module 111, the resistance R4 other end and filtering
The input connection of module 112.
Specifically, one-way conduction module 111 is diode D1, and diode D1 anode is the input of one-way conduction module
End, diode D1 negative electrode are the output end of one-way conduction module.
Certainly, one-way conduction module 111 can also use triode or metal-oxide-semiconductor and its equivalent circuit to realize.
Specifically, filtration module 112 includes：
Resistance R1 and electric capacity C1；
Resistance R1 one end is connected for the input of filtration module 112 with electric capacity C1 one end, and the electric capacity C1 other end is
The output end of filtration module 112, the resistance R1 other end are grounded simultaneously with the electric capacity C1 other end.
Certainly, filtration module 112 can also use other filter structures, such as RCL filter structures, wherein electric capacity and resistance
Both it can be realized by discrete device, its equivalent resistance or equivalent capacity can also be set to realize in processing unit.
What deserves to be explained is detection unit can also only include filtration module 112, need unidirectionally to believe in filtration module 112
Number when, one-way conduction module 111 can be set in detection unit, signal is first passed through one-way conduction module 111 and export unidirectionally
Filtration module 112 is given to after signal.
It is of course also possible to use i.e. filtration module 112 containing one-way conduction function itself, now can be with detection unit
Do not include one-way conduction module 111.
Or the realization of filtration module 112 need not limit polarity, now, can also be not provided with detection unit
One-way conduction module 111.When being not provided with one-way conduction module 111, if 112 filtered waveform of filtration module has positive and negative portion
Point, reception can be matched by way of rear end matching unit or MCU interface processing positive-negative polarity or by Differential Input.
As the embodiment of the utility model one, rear end matching unit 10 includes：
Compare judgement unit 101, for making decisions conversion to envelope waveform according to amplitude threshold, and it is single to be sent to processing
First MCU carries out back-end processing, and the first input end for comparing judgement unit 101 is the input and detection list of rear end matching unit 10
The output end connection of member 11, the output end for comparing judgement unit 101 are the output end and processing unit MCU of rear end matching unit 10
The first input/output interface connection；
More preferably, it is comparator U1 to compare judgement unit 101, and comparator U1 positive input is to compare judgement unit
101 first input end connection detection unit 11, comparator U1 the second input is the reverse input for comparing judgement unit 101
End connection amplitude threshold setting unit 102, comparator U1 output end are to compare the output end connection processing list of judgement unit 101
First MCU, comparator U1 power end connection supply voltage VCC, comparator U1 earth terminal ground connection.
What deserves to be explained is the connection of the positive input and reverse input end of comparator can be exchanged, it is defeated when exchanging
Enter the opposite in phase of signal, also or Differential Input can be used.
Amplitude threshold setting unit 102, the amplitude threshold of judgement unit 101 is compared for setting, and amplitude threshold sets single
First 102 input is connected with processing unit MCU the second input/output interface, the output end of amplitude threshold setting unit 102
The second input connection of judgement unit 101 compared with.
More preferably, amplitude threshold setting unit 102 includes：
Resistance R2 and resistance R3；
Resistance R3 one end connects processing unit MCU for the input of amplitude threshold setting unit 102, and resistance R3's is another
Hold and compare judgement unit 101 for the output end connection of amplitude threshold setting unit 102, the resistance R3 other end also passes through resistance R2
Ground connection.
In the utility model embodiment, resistance R2 and/or resistance R3 can use discrete device to realize, can also pass through
Equivalent resistance is set to realize in processing unit.
What deserves to be explained is the connection of the positive input and reverse input end of comparator can be exchanged, it is defeated when exchanging
Enter the opposite in phase of signal, also or Differential Input can be used.
In the utility model embodiment, comparator U1 differentiates to valid data, is set by resistance R2 and resistance R3
Put amplitude threshold, comparator U1 by current input value compared with amplitude threshold, if input value is more than amplitude threshold, comparator U1
High level signal is exported, if input value is less than amplitude threshold, comparator U1 exports low level signal, and the height of output is electric
Ordinary mail number is sent to processing unit and carries out back-end processing.
The utility model embodiment is built into the near-field communication with backend arrangement using a small amount of discrete component and demodulates electricity
Road, low in energy consumption, debugging is simple, and the waveform of former modulation intelligence, easy and effective, cost are extracted by way of comparing to determine
It is low.
Fig. 3 shows the example of the near-field communication demodulator circuit for the sampling type rear end matching that the utility model embodiment provides
Circuit structure, for convenience of description, it illustrate only the part related to the utility model.
As the embodiment of the utility model one, detection unit 11 includes：
One-way conduction module 111 and filtration module 112；
The input of filtration module 112 for detection unit 11 input connect near field antenna 2, filtration module 112 it is defeated
Go out end to be connected with the input of one-way conduction module 111, the output end of one-way conduction module 111 is the output end of detection unit 11
Connect sampling unit 12.
Specifically, one-way conduction module 111 is diode D2, and diode D2 anode is the defeated of one-way conduction module 111
Enter end, diode D2 negative electrode is the output end of one-way conduction module 111.
Filtration module 112 can include：
Resistance R5, electric capacity C2 and inductance L1；
Inductance L1 is in parallel with electric capacity C2, and electric capacity C2 one end is the input end grounding of filtration module 112, and electric capacity C2's is another
Hold and be grounded for the output end of filtration module 112 by resistance R5, the electric capacity C2 other end is the output end of filtration module 112.
Wherein electric capacity and resistance can both be realized by discrete device, and its equivalent resistance can also be set in process chip
Or equivalent capacity is realized.
As the embodiment of the utility model one, rear end matching unit 10 can also use sampling unit to realize, sampling unit
Can be specially analog-to-digital conversion module ADC, analog-to-digital conversion module ADC analog input end is the input of sampling unit 10, mould
Number modular converter ADC digital output end is the output end of sampling unit.
In the utility model embodiment, by AD sampled sense voltage range values, voltage amplitude value meets or exceeds limit
When determining threshold value, sampling unit 10 exports high level, and when voltage amplitude value is less than threshold value is limited, sampling unit 10 exports low level,
When AD is sampled, modulation system is not limited to OOK, extracts the waveform of former modulation intelligence, can also use other modulation methods such as ASK
Method.
In the utility model embodiment, read write line A is toward label B write information.Read write line A is in communication, there is provided carrier wave is believed
Number.During transmission, carrier wave is modulated by ASK (amplitude shift key modulation) or OOK (on-off keying) according to information is sent, in addition
It is not exclusively by adjusting carrier frequency, by deviateing the matching frequency of coil, reaches the equivalent effect of amplitude modulation(PAM) indirectly.Send
Information can be existing standard interface signal, such as UART, IIC, SPI, single wire transmission agreement etc. or customized
The signal of the modulation formats such as the frequency modulation of low speed, amplitude modulation, can be square wave, sine wave, triangular wave or waveform customization.
Label B obtains the waveform of former modulated signal after carrier wave is filtered, and rear end MCU is output to by communications pins interface
The chips such as MCU are connected to etc. processing of circuit, or by rear end match circuit.If modulated signal is existing standard interface
Signal, such as UART signal, the hardware UART interface of the circuits such as rear end MCU can be directly connected to, so as to simplify communication mode,
Reach the effect of transparent transmission.
The utility model embodiment is built into the near-field communication with backend arrangement using a small amount of discrete component and demodulates electricity
Road, low in energy consumption, debugging is simple, and the waveform of former modulation intelligence, easy and effective, cost are extracted by way of comparing to determine
It is low.
What deserves to be explained is the near-field communication demodulator circuit of the rear end matching in above-described embodiment, can be by discrete
Device is realized, or partly or entirely circuit can be integrated in chip together with processing unit MCU.
What deserves to be explained is the near-field communication modulation-demodulation circuit in above-described embodiment can be real by discrete device
It is existing, it can also be either partially or completely integrated in process chip.
Individually it is physically present, can also separates in addition, the unit or device in above-described embodiment can be units
Set, can partly be realized using discrete device, be partly integrated in chip, or multiplexing part resistance, electric capacity, electricity in the chips
Sense, switching device etc..For example, the resistance in above-described embodiment can pass through MCU interfaces or the equivalent inpnt of rear end part circuit
Impedance is substituted, and electric capacity can be caused by equivalent input capacitance or PCB (circuit board) wiring of MCU interfaces or rear end part circuit
Distribution capacity, or component parasitic capacitance (body capacitance between such as metal-oxide-semiconductor grid drain electrode) in itself substitutes.Inductance is also possible to
There is equivalent inductance caused by PCB (circuit board) wirings, component substitutes in the equivalent inductive reactance that some frequency range is presented.
And above-mentioned functional unit can both be realized by the way of hardware, the form of SFU software functional unit can also be used
Realize.
The another object of the utility model embodiment is, there is provided a kind of near-field communication demodulation of integrated above-mentioned rear end matching
The safety chip of circuit and processing unit.
Preferred embodiment of the present utility model is these are only, it is all in this practicality not to limit the utility model
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (11)
1. a kind of near-field communication demodulator circuit of rear end matching, is connected between near field antenna and processing unit, it is characterised in that
The circuit is located at the tab end of near-field communication, and the circuit includes：
Rear end matching is carried out to the interface signal that the near field antenna receives, and is sent to the processing unit and carries out back-end processing
Rear end matching unit, the input of the rear end matching unit is connected with the near field antenna, the rear end matching unit
Output end is connected with the processing unit.
2. circuit as claimed in claim 1, it is characterised in that the rear end matching unit includes：
Conversion is made decisions to envelope waveform according to amplitude threshold, and is sent to the comparison that the processing unit carries out back-end processing
Judgement unit, the first input end of the relatively judgement unit is the input of the rear end matching unit, described relatively to differentiate
The output end of unit is connected for the output end of the rear end matching unit with the first input/output interface of the processing unit；
The amplitude threshold setting unit of the amplitude threshold, input and the processing of the amplitude threshold setting unit are set
The second input/output interface connection of unit, the output end of the amplitude threshold setting unit compared with described judgement unit the
Two inputs connect.
3. circuit as claimed in claim 2, it is characterised in that the relatively judgement unit is comparator, the comparator
Positive input is the first input end of the relatively judgement unit, and the reverse input end of the comparator is the relatively differentiation
Second input of unit connects the amplitude threshold setting unit, and the output end of the comparator is the relatively judgement unit
Output end connect the processing unit, the power end connection supply voltage of the comparator, the ground connection termination of the comparator
Ground.
4. circuit as claimed in claim 2, it is characterised in that the amplitude threshold setting unit includes：
Resistance R2 and resistance R3；
One end of the resistance R3 connects processing unit for the input of the amplitude threshold setting unit, and the resistance R3's is another
One end connects the relatively judgement unit for the output end of the amplitude threshold setting unit, and the other end of the resistance R3 is also logical
Cross the resistance R2 ground connection.
5. circuit as claimed in claim 1, it is characterised in that the rear end matching unit is：
Envelope waveform is sampled by AD and carries out rear end matching, and the voltage amplitude value generation sampled value hair read according to sampling
The sampling unit that the processing unit carries out back-end processing is given, the input of the sampling unit is the rear end matching unit
Input connection, the output end of the sampling unit is the output end of the rear end matching unit.
6. circuit as claimed in claim 5, it is characterised in that the sampling unit is analog-to-digital conversion module, and the modulus turns
The analog input end for changing the mold block is the input of the sampling unit, and the digital output end of the analog-to-digital conversion module is adopted to be described
The output end of sample unit.
7. circuit as claimed in claim 1, it is characterised in that the circuit also includes：
The carrier wave in the modulated signal that the near field antenna receives is filtered out, to retain the envelope waveform of modulation intelligence for rear end
The detection unit of matching, the input of the detection unit are connected with the near field antenna, the output end of the detection unit with
The input connection of the rear end matching unit.
8. circuit as claimed in claim 7, it is characterised in that the detection unit includes：
One-way conduction module and filtration module；
The input of the one-way conduction module connects the near field antenna for the input of the detection unit, described unidirectionally to lead
The output end of logical module is connected with the input of the filtration module, and the output end of the filtration module is the detection unit
Output end connects the rear end matching unit.
9. circuit as claimed in claim 8, it is characterised in that the detection unit also includes：
Resistance R4, one end of the resistance R4 are connected with the output end of the one-way conduction module, the other end of the resistance R4
It is connected with the input of the filtration module.
10. the circuit as described in any one of claim 1 to 9, it is characterised in that the circuit is realized by discrete device or institute
Circuit is stated to be integrated in chip with the processing unit.
11. a kind of safety chip, it is characterised in that the safety chip is integrated just like after described in any one of claim 1 to 9
Hold the near-field communication demodulator circuit and processing unit of matching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720300729.XU CN206820750U (en) | 2017-03-24 | 2017-03-24 | A kind of the near-field communication demodulator circuit and safety chip of rear end matching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720300729.XU CN206820750U (en) | 2017-03-24 | 2017-03-24 | A kind of the near-field communication demodulator circuit and safety chip of rear end matching |
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| Publication Number | Publication Date |
|---|---|
| CN206820750U true CN206820750U (en) | 2017-12-29 |
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ID=60751782
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| CN201720300729.XU Active CN206820750U (en) | 2017-03-24 | 2017-03-24 | A kind of the near-field communication demodulator circuit and safety chip of rear end matching |
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| Country | Link |
|---|---|
| CN (1) | CN206820750U (en) |
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2017
- 2017-03-24 CN CN201720300729.XU patent/CN206820750U/en active Active
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