CN206819380U - A kind of near-field communication modulation-demodulation circuit, safety chip and dynamic token - Google Patents
A kind of near-field communication modulation-demodulation circuit, safety chip and dynamic token Download PDFInfo
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- CN206819380U CN206819380U CN201720301027.3U CN201720301027U CN206819380U CN 206819380 U CN206819380 U CN 206819380U CN 201720301027 U CN201720301027 U CN 201720301027U CN 206819380 U CN206819380 U CN 206819380U
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Abstract
The utility model is applied to near-field communication field, there is provided a kind of near-field communication modulation-demodulation circuit, safety chip, dynamic token, contact type intelligent card, Non-contact Media Reader, digital signature device and near field communication tag, the circuit include detection unit；The input of detection unit is connected near field coil, and the output end of detection unit and the reception signal end of process chip connect.The utility model is built into near-field communication modulation-demodulation circuit using a small amount of discrete component, encapsulation is small, cost is low for it, communication mode is simplified on the premise of retention property, debugging is simple, and antenna does not produce power consumption when not communicating, other antenna communications are nor affected on, there is jamproof beneficial effect low in energy consumption.
Description
Technical field
The utility model belongs to near-field communication field, more particularly to a kind of near-field communication modulation-demodulation circuit, safety chip,
Dynamic token, contact type intelligent card, Non-contact Media Reader, digital signature device and near field communication tag.
Background technology
NFC (Near Field Communication, near-field communication technology) is a kind of radio communication of short distance high frequency
Technology, using actively and passively two kinds of read modes.In the passive mode, start the equipment of near-field communication, also referred to as initiate to set
Standby (main equipment), radiofrequency field (RF-field) is provided in whole communication process.It can select a kind of transmission speed, by data
It is sent to another equipment.Another equipment is referred to as target device (slave unit), it is not necessary to produces radiofrequency field, and uses load modulation
(load modulation) technology, pass data back initiating equipment, complete information exchange.
But the modulation-demodulation technique of near field communication is completed usually using integrated NFC communication chip at present, still
Because the production cycle of NFC communication chip is longer, chip interface is also more, so as to result in the process interface of near-field communication realization
The problem of method is complicated, and product power consumption is big.
Utility model content
The purpose of the utility model embodiment is to provide a kind of near-field communication modulation-demodulation circuit, it is intended to which solution currently makes
Carrying out near-field communication with integrated NFC communication chip causes the problem of product power consumption is big, cost is high.
The utility model embodiment is achieved in that a kind of near-field communication modulation-demodulation circuit, is connected near field antenna
Between process chip, the near field antenna, which includes near field coil and matching capacitance C1, the circuit, to be included：
Retain the detection unit of the envelope waveform of modulation intelligence by detection；
The input of the detection unit is connected with the near field coil, the output end of the detection unit and the processing
The reception signal end connection of chip, demodulated signal is sent to the process chip.
In said structure, the detection unit includes filter unit, and the input of the filter unit is the detection list
The input of member, the output end of the filter unit are the output end of the detection unit.
In said structure, the detection unit also includes one-way conduction unit；
The input of the one-way conduction unit is connected with the near field coil, the output end of the one-way conduction unit with
The filter unit connection；
Or, the input of the one-way conduction unit is connected with the output end of the filter unit, the one-way conduction list
The output end of member is connected with the process chip.
In said structure, the filter unit includes：
Resistance R2 and electric capacity C2；
One end of the resistance R2 is connected for the input of the filter unit with one end of the electric capacity C2, the electric capacity
C2 one end is the output end of the filter unit, and the other end of the other end of the resistance R2 and the electric capacity C2 connects simultaneously
Ground；
The resistance R2 is multiplexed with the resistance in the process chip, or the resistance R2 and electric capacity C2 and the place
Manage the resistance in chip, electric capacity is multiplexed；
Or, the filter unit includes：
Resistance R5, electric capacity C4 and inductance L1；
One end of the electric capacity C4 is the input of the filter unit, and the other end of the electric capacity C4 is single for the filtering
The output end of member is grounded by the resistance R5, and the inductance L1 is in parallel with the electric capacity C4；
The resistance R5 and/or electric capacity C4 is multiplexed with the resistance in the process chip and/or electric capacity.
In said structure, the circuit also includes：
Resistance R3, one end of the resistance R3 are connected with the one-way conduction unit, the other end of the resistance R3 and institute
State filter unit connection.
In said structure, the circuit also includes：
By controlling the load change of the near field coil to carry out load modulation and sending the load modulation list of modulated signal
Member, the first end of the load modulating unit are connected with the output end of the one-way conduction unit, the load modulating unit
Second end is connected with the input/output interface of the process chip, the 3rd end of the load modulating unit and the process chip
Transmission signal end connection.
In said structure, the load modulating unit is on-off circuit module；
The current input terminal of the on-off circuit module for it is described load modulating unit first end, the on-off circuit mould
The current output terminal ground connection of block, the first control terminal of the on-off circuit module are the second end of the load modulating unit, institute
The second control terminal for stating on-off circuit module is the 3rd end of the load modulating unit.
In said structure, the load modulating unit also includes：
Load control module, the first end of the load control module is the first end for loading modulating unit, described
Second end of load control module is connected with the current input terminal of the on-off circuit module.
In said structure, the on-off circuit module includes：
First switch pipe and resistance R1；
The current input terminal of the first switch pipe be the on-off circuit module current input terminal, the first switch
The current output terminal of pipe is the current output terminal of the on-off circuit module, and the control terminal of the first switch pipe is the switch
First control terminal of circuit module is connected with one end of the resistance R1, and the other end of the resistance R1 is the on-off circuit mould
Second control terminal of block.
Or, the on-off circuit module includes：
Second switch pipe and the 3rd switching tube；
The current input terminal of the second switch pipe be the on-off circuit module current input terminal, the second switch
The current output terminal of pipe be the on-off circuit module current output terminal, the control terminal of the second switch pipe and the described 3rd
The current output terminal connection of switching tube, the current input terminal of the 3rd switching tube control for the first of the on-off circuit module
End, the control terminal of the 3rd switching tube are the second control terminal of the on-off circuit module；
Or, the on-off circuit module includes：
4th switching tube, the current input terminal of the 4th switching tube input for the electric current of the on-off circuit module simultaneously
End and the first control terminal, the control terminal of the 4th switching tube are the second control terminal of the on-off circuit module, the described 4th
The current output terminal of switching tube is the current output terminal of the on-off circuit module；
The switching tube is multiplexed with the switching tube in the process chip.
In said structure, the load control module is that resistance R4, the resistance R4 both ends are respectively the load control
The first end of molding block and the second end；
Or, the load control module includes：
Resistance R6 and electric capacity C3；
The resistance R6 is in parallel with the electric capacity C3, and two common ports in parallel are respectively the first of the load control module
End and the second end；
Resistance and/or electric capacity in the load control module are multiplexed with the electric capacity in the process chip.
In said structure, the circuit is realized by discrete device.
The another object of the utility model embodiment is, there is provided one kind integrate above-mentioned near-field communication modulation-demodulation circuit and
The safety chip of the process chip.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Dynamic token.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Contact type intelligent card.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Non-contact Media Reader.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Digital signature device.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Near field communication tag.
The utility model embodiment is built into near-field communication modulation-demodulation circuit using a small amount of discrete component, and it is encapsulated
It is small, cost is low, simplifies communication mode on the premise of retention property, debugging is simple, and antenna does not produce when not communicating
Power consumption, other antenna communications are nor affected on, there is jamproof beneficial effect low in energy consumption.
Brief description of the drawings
Fig. 1 is the structure chart for the near-field communication modulation-demodulation circuit that the utility model first embodiment provides；
Fig. 2 is the exemplary circuit figure for the near-field communication modulation-demodulation circuit that the utility model second embodiment provides；
Fig. 3 is the exemplary circuit figure for the near-field communication modulation-demodulation circuit that the utility model 3rd embodiment provides；
Fig. 4 is the exemplary circuit figure for the near-field communication modulation-demodulation circuit that the utility model fourth embodiment provides；
Fig. 5-1 to Fig. 5-4 is that the near-field communication modulation-demodulation circuit that the utility model embodiment provides is each in modulation /demodulation
The oscillogram of step.
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 near-field communication modulation-demodulation circuit using a small amount of discrete component, and it is encapsulated
It is small, cost is low, simplifies communication mode on the premise of retention property, debugging is simple, and antenna does not produce when not communicating
Power consumption, other antenna communications are nor affected on, there is jamproof beneficial effect low in energy consumption.
Fig. 1 shows the structure for the near-field communication modulation-demodulation circuit that the utility model first embodiment provides, in order to just
In explanation, the part related to the utility model illustrate only.
As the embodiment of the utility model one, the near-field communication modulation-demodulation circuit can apply to various near-field communication electricity
Lu Zhong, the safety chip that is particularly suitable for use in, dynamic token, contact type intelligent card, Non-contact Media Reader, digital signature device
And near field communication tag, the near-field communication modulation-demodulation circuit is connected between near field antenna and process chip MCU, near field day
Line includes near field coil 2 and matching capacitance C1, and the best match frequency of near field coil 2 matches with the carrier frequency chosen, and this is near
Field communication modulation demodulator circuit includes：
Detection unit 100, for by detection detection, the carrier wave in modulated signal being filtered out, to retain the bag of modulation intelligence
Network waveform；
The input of detection unit 100 is connected near field coil 2, and the output end of detection unit 100 is with process chip MCU's
The RX connections of reception signal end, demodulated signal is sent to process chip MCU.
Alternatively, with reference to Fig. 2, detection unit 100 can include filter unit 12, and the input of filter unit 12 is detection
The input of unit 100, the output end of filter unit 12 are the output end of detection unit 100.
Preferably, detection unit 100 also includes one-way conduction unit 11；
The input of one-way conduction unit 11 is connected near field coil 2, and the output end of one-way conduction unit 11 and filtering are single
Member 12 connects；
Or, the input of one-way conduction unit 11 is connected with the output end of filter unit 12, one-way conduction unit 11 it is defeated
Go out end to be connected with process chip.
What deserves to be explained is detection unit 100 can also only include filter unit 12, need unidirectionally to believe in filter unit 12
Number when, one-way conduction unit 11 can be set in detection unit 100, signal is first passed through one-way conduction unit 11 and export unidirectionally
Filter unit 12 is given to after signal.
It is of course also possible to use itself is the filter unit 12 containing one-way conduction function, now can in detection unit 100
Not include one-way conduction unit 11.
Or the realization of filter unit 12 need not limit polarity, now, can not also be set in detection unit 100
Put one-way conduction unit 11.
When being not provided with one-way conduction unit 11, if 12 filtered waveform of filter unit has positive negative part, can pass through
Rear end matching unit or MCU interface handle positive-negative polarity or reception are matched by way of Differential Input.
In the utility model embodiment, one-way conduction unit 11 can again diode or other can play and unidirectionally lead
The equivalent devices or circuit realiration that the components such as the logical metal-oxide-semiconductor acted on, triode are formed.
Preferably, the near-field communication modulation-demodulation circuit can also include：
Modulating unit is loaded, referring to Fig. 2, for by controlling the load of near field coil change to carry out to load modulation and to mark
Sign and issue and send modulated signal, the single first end of load modulation is connected with the output end of one-way conduction unit 11, loads modulating unit
Second end is connected with process chip MCU input/output interface, loads the 3rd end of modulating unit and process chip MCU transmission
Signal end TX connections.
As the embodiment of the utility model one, the second end and the 3rd end for loading modulating unit can be connect by communications pins
Mouth TX, RX and process chip MCU connections, can also be connected by rear end match circuit with process chip MCU.
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.
Read write line A reads information from label B.Read write line A is in communication, there is provided carrier signal.It is non-to meet front end B when reading information,
Coil equivalent load is modulated by ASK (amplitude shift key modulation) or OOK (on-off keying) according to information is sent.Send
Information can be existing standard interface signal, such as UART, IIC, SPI, single wire transmission agreement etc. or customized low
Frequency modulation, the signal of the modulation format such as amplitude modulation of speed, can be square wave, sine wave, triangular wave or waveform customization.If modulation
Signal is existing standard interface signal, and such as UART signal, the hardware UART interface TX signals of the circuit such as rear end MCU can be straight
The TX of label B front end is connected to, so as to simplify communication mode, reaches the effect of transparent transmission.
The change of each step waveform of modulation /demodulation and the waveform conversion of penetration transmission scheme referring to Fig. 5-1 to Fig. 5-4, wherein Fig. 5-
1 is that the carrier signal of the generation at read write line A ends is high_frequency sine wave, and Fig. 5-2 is the UART signal that modulated signal is standard, Fig. 5-
3 be the signal modulated by read write line OOK or ASK, and then label B termination receives the signal modulated, and original is obtained after filtering
Beginning modulation waveform, can export the waveform such as Fig. 5-4 by rear end match circuit, and the UART that can also be directly connected to MCU connects
Mouthful, reach transparent transmission effect.
The utility model embodiment is built into near-field communication modulation-demodulation circuit using a small amount of discrete component, and it is encapsulated
It is small, cost is low, simplifies communication mode on the premise of retention property, debugging is simple, and antenna does not produce when not communicating
Power consumption, other antenna communications are nor affected on, there is jamproof beneficial effect low in energy consumption.
Fig. 2 shows the exemplary circuit knot for the near-field communication modulation-demodulation circuit that the utility model second 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, one-way conduction unit 11 is diode D1, and diode D1 anode is unidirectional
The input of onunit 11, diode D1 negative electrode are the output end of one-way conduction unit 11.
Filter unit 12 includes：
Resistance R2 and electric capacity C2；
Resistance R2 one end is connected for the input of filter unit 12 with electric capacity C2 one end, and electric capacity C2 one end is filtering
The output end of unit 12, the resistance R2 other end are grounded simultaneously with the electric capacity C2 other end.
What deserves to be explained is the resistance in resistance R2 and electric capacity C2 and process chip MCU, electric capacity can be multiplexed, or
Same equivalent resistance, equivalent capacity are set in process chip MCU.
Alternatively, the near-field communication modulation-demodulation circuit can also include：
For controlling the resistance R3 of load, resistance R3 one end is connected with the output end of one-way conduction unit 11, resistance R3
The other end be connected with the input of filter unit 12.
As the embodiment of the utility model one, load modulating unit is on-off circuit module 131；
The current input terminal of on-off circuit module 131 for load modulating unit first end, the electricity of on-off circuit module 131
Flow output head grounding, the first control terminal GPIO of on-off circuit module 131 is the second end of load modulating unit, on-off circuit mould
Second control terminal TX of block 131 is the 3rd end of load modulating unit 13.
Alternatively, load modulating unit also includes：
Load control module 132, the first end of load control module 132 is the first end of load modulating unit, loads control
Second end of molding block 132 is connected with the current input terminal of on-off circuit module 131.
Specifically, on-off circuit module 131 includes：
First switch pipe Q1 and resistance R1；
First switch pipe Q1 current input terminal is the current input terminal of on-off circuit module 131, first switch pipe Q1's
Current output terminal is the current output terminal of on-off circuit module 131, and first switch pipe Q1 control terminal is on-off circuit module 131
The first control terminal be connected with resistance R1 one end, the resistance R1 other end is the second control terminal of on-off circuit module 131.
What deserves to be explained is the first switch pipe Q1 and resistance R1 in on-off circuit module 131 can be in process chips
It is multiplexed in MCU.
In the utility model embodiment, process chip MCU GPIO port can be arranged to open-drain output, by handling
The switch of chip MCU controlling switch pipes, the load of near field coil can be changed by the switch switching of switching tube, near field coil is born
The transmit coil at read write line end can be coupled to by carrying change, and the transmit coil load change that read write line passes through can demodulate modulation letter
Breath.
Specifically, load control module 132 includes：
Resistance R6 and electric capacity C3；
Resistance R6 is in parallel with electric capacity C3, and two common ports in parallel are respectively the first end and second of load control module 132
End；
What deserves to be explained is resistance R6 and electric capacity C3 can be with the resistance and electric capacity in multiplexing process chip MCU, Huo Zhe
Its equivalent resistance and equivalent capacity are set in process chip MCU.
Fig. 3 shows the exemplary circuit knot for the near-field communication modulation-demodulation circuit that the utility model 3rd 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, filter unit 12 can also include：
Resistance R5, electric capacity C4 and inductance L1；
Electric capacity C4 one end is the input of filter unit 12, and the electric capacity C4 other end leads to for the output end of filter unit 12
Resistance R5 ground connection is crossed, inductance L1 is in parallel with electric capacity C4；
Resistance and/or electric capacity in resistance R5 and/or electric capacity C4 and process chip MCU are multiplexed, can also by rear end etc.
Impedance, capacitive reactance, induction reactance etc. is imitated to substitute.
Specifically, on-off circuit module 131 includes：
Second switch pipe Q2 and the 3rd switching tube Q3；
Second switch pipe Q2 current input terminal is the current input terminal of on-off circuit module 131, second switch pipe Q2's
Current output terminal is the current output terminal of on-off circuit module 131, and second switch pipe Q2 control terminal is with the 3rd switching tube Q3's
Current output terminal connects, and the 3rd switching tube Q3 current input terminal is the first control terminal of on-off circuit module 131, and the 3rd switchs
Pipe Q3 control terminal is the second control terminal of on-off circuit module 131；
What deserves to be explained is the second switch pipe Q2 and the 3rd switching tube Q3 in on-off circuit module 131 can locate
It is multiplexed in reason chip MCU.
In the utility model embodiment, in order to prevent false triggering, load switch is controlled by TX and GPIO simultaneously, and adopt
With two switching tubes, pass through two on off state control load modulation.
Fig. 4 shows the exemplary circuit knot for the near-field communication modulation-demodulation circuit that the utility model 3rd 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 electric capacity in filter unit 12 is multiplexed with the electric capacity in process chip MCU.
On-off circuit module 131 can also only include：
4th switching tube Q4, the 4th switching tube Q4 current input terminal input for the electric current of on-off circuit module 131 simultaneously
End and the first control terminal, the 4th switching tube Q4 control terminal are the second control terminal of on-off circuit module 131, the 4th switching tube Q4
Current output terminal be on-off circuit module 131 current output terminal；
Switching tube in on-off circuit module 131 can be multiplexed with the switching tube in process chip MCU.
Load control module 132 includes：
Resistance R4；
Resistance R4 both ends are respectively first end and the second end of load control module 132.
In the utility model embodiment, on-off circuit module 131 is made up of metal-oxide-semiconductor Q4, is formed on-off circuit, is passed through
The switch switching of metal-oxide-semiconductor can change the load of coil, and coil load changes the transmit coil that can be coupled to read write line end, read-write
The transmit coil load change that device passes through can demodulate modulation intelligence.
What deserves to be explained is the near-field communication modulation-demodulation circuit in above-described embodiment can be realized by discrete device,
It can also be either partially or completely integrated in chip and realize.
Read write line A is toward label B write information；
Read write line A is in communication, there is provided carrier signal.During transmission, GPIO is arranged to export low level, keeps the 4th switch
Pipe Q4 off states, read write line modulated signal are the UART signals of standard, are modulated by OOK.The non-front end B that connects is filtering carrier wave
Afterwards, the waveform of former modulated signal is obtained, the processing of circuit such as rear end MCU are output to by communication interface pin.Modulated signal is mark
Accurate UART signal, the hardware UART interface of the circuits such as rear end MCU is directly connected to, reaches the effect of transparent transmission.
Read write line A reads information from label B；
Read write line A is in communication, there is provided carrier signal.When reading information, label B passes through OOK modulation lines according to information is sent
Enclose equivalent load.Modulated signal is that the hardware UART interface TX signals of the circuit such as the UART signal of standard, rear end MCU can be direct
The non-TX for meeting front end B is connected to, reaches the effect of transparent transmission.GPIO is arranged to input and does not control the 4th switching tube Q4, is controlled completely by TX
Make the 4th switching tube Q4 break-make.TX sends high level and turns on the 4th switching tube Q4, antenna ends voltage by diode D1 and
Resistance R4 discharges, and reduces voltage amplitude.TX sends low level and turns off the 4th switching tube Q4, and antenna ends can only pass through diode
D1, resistance R2, resistance R3 loops, resistance R2 and resistance R3 resistance values are very big, antenna ends voltage amplitude value are kept, so as to form
One ohmic load modulation circuit.
The utility model embodiment is built into near-field communication modulation-demodulation circuit using a small amount of discrete component, and it is encapsulated
It is small, cost is low, simplifies communication mode on the premise of retention property, debugging is simple, and antenna does not produce when not communicating
Power consumption, other antenna communications are nor affected on, there is jamproof beneficial effect low in energy consumption.
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 one kind integrate above-mentioned near-field communication modulation-demodulation circuit and
The safety chip of the process chip.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Dynamic token.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Contact type intelligent card.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Non-contact Media Reader.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Digital signature device.
The another object of the utility model embodiment is, there is provided a kind of including above-mentioned near-field communication modulation-demodulation circuit
Near field communication tag.
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 (17)
1. a kind of near-field communication modulation-demodulation circuit, is connected between near field antenna and process chip, the near field antenna includes
Near field coil and matching capacitance C1, it is characterised in that the circuit includes：
Retain the detection unit of the envelope waveform of modulation intelligence by detection；
The input of the detection unit is connected with the near field coil, the output end of the detection unit and the process chip
Reception signal end connection, to the process chip send demodulated signal.
2. circuit as claimed in claim 1, it is characterised in that the detection unit includes filter unit, the filter unit
Input be the detection unit input, the output end of the filter unit is the output end of the detection unit.
3. circuit as claimed in claim 2, it is characterised in that the detection unit also includes one-way conduction unit；
The input of the one-way conduction unit is connected with the near field coil, the output end of the one-way conduction unit with it is described
Filter unit connects；
Or, the input of the one-way conduction unit is connected with the output end of the filter unit, the one-way conduction unit
Output end is connected with the process chip.
4. circuit as claimed in claim 2, it is characterised in that the filter unit includes：
Resistance R2 and electric capacity C2；
One end of the resistance R2 is connected for the input of the filter unit with one end of the electric capacity C2, the electric capacity C2's
One end is the output end of the filter unit, and the other end of the other end of the resistance R2 and the electric capacity C2 is grounded simultaneously；
The resistance R2 is multiplexed with the resistance in the process chip, or the resistance R2 and electric capacity C2 and the processing core
Resistance, electric capacity multiplexing in piece；
Or, the filter unit includes：
Resistance R5, electric capacity C4 and inductance L1；
One end of the electric capacity C4 is the input of the filter unit, and the other end of the electric capacity C4 is the filter unit
Output end is grounded by the resistance R5, and the inductance L1 is in parallel with the electric capacity C4；
The resistance R5 and/or electric capacity C4 is multiplexed with the resistance in the process chip and/or electric capacity.
5. circuit as claimed in claim 3, it is characterised in that the circuit also includes：
Resistance R3, one end of the resistance R3 are connected with the one-way conduction unit, the other end and the filter of the resistance R3
Ripple unit connects.
6. circuit as claimed in claim 3, it is characterised in that the circuit also includes：
By controlling the load change of the near field coil to carry out loading modulation and sending the load modulating unit of modulated signal, institute
The first end for stating load modulating unit is connected with the output end of the one-way conduction unit, the second end of the load modulating unit
It is connected with the input/output interface of the process chip, the 3rd end of the load modulating unit and the transmission of the process chip
Signal end connects.
7. circuit as claimed in claim 6, it is characterised in that the load modulating unit is on-off circuit module；
The current input terminal of the on-off circuit module is the first end for loading modulating unit, the on-off circuit module
Current output terminal is grounded, and the first control terminal of the on-off circuit module is second end for loading modulating unit, described to open
The second control terminal for closing circuit module is the 3rd end of the load modulating unit.
8. circuit as claimed in claim 7, it is characterised in that the load modulating unit also includes：
Load control module, the first end of the load control module are the first end of the load modulating unit, the load
Second end of control module is connected with the current input terminal of the on-off circuit module.
9. circuit as claimed in claim 7, it is characterised in that the on-off circuit module includes：
First switch pipe and resistance R1；
The current input terminal of the first switch pipe is the current input terminal of the on-off circuit module, the first switch pipe
Current output terminal is the current output terminal of the on-off circuit module, and the control terminal of the first switch pipe is the on-off circuit
First control terminal of module is connected with one end of the resistance R1, and the other end of the resistance R1 is the on-off circuit module
Second control terminal；
Or, the on-off circuit module includes：
Second switch pipe and the 3rd switching tube；
The current input terminal of the second switch pipe be the on-off circuit module current input terminal, the second switch pipe
Current output terminal be the on-off circuit module current output terminal, the control terminal of the second switch pipe opens with the described 3rd
The current output terminal connection of pipe is closed, the current input terminal of the 3rd switching tube controls for the first of the on-off circuit module
End, the control terminal of the 3rd switching tube are the second control terminal of the on-off circuit module；
Or, the on-off circuit module includes：
4th switching tube, the current input terminal of the 4th switching tube simultaneously the current input terminal for the on-off circuit module and
First control terminal, the control terminal of the 4th switching tube are the second control terminal of the on-off circuit module, the 4th switch
The current output terminal of pipe is the current output terminal of the on-off circuit module；
The switching tube is multiplexed with the switching tube in the process chip.
10. circuit as claimed in claim 8, it is characterised in that the load control module is resistance R4, the resistance R4's
Both ends are respectively first end and the second end of the load control module；
Or, the load control module includes：
Resistance R6 and electric capacity C3；
The resistance R6 is in parallel with the electric capacity C3, two common ports in parallel be respectively the load control module first end and
Second end；
Resistance and/or electric capacity in the load control module are multiplexed with the electric capacity in the process chip.
11. the circuit as described in any one of claim 1 to 10, it is characterised in that the circuit is realized by discrete device.
12. a kind of safety chip, it is characterised in that the safety chip is integrated near as described in any one of claim 1 to 10
Circuit in field communication modulation demodulator circuit and the process chip.
13. a kind of dynamic token, it is characterised in that the dynamic token includes near as described in any one of claim 1 to 10
Field communication modulation demodulator circuit.
14. a kind of contact type intelligent card, it is characterised in that the contact type intelligent card includes such as claim 1 to 10 times
Near-field communication modulation-demodulation circuit described in one.
15. a kind of Non-contact Media Reader, it is characterised in that the Non-contact Media Reader is included as claim 1 to 5 is any
Near-field communication modulation-demodulation circuit described in.
16. a kind of digital signature device, it is characterised in that the digital signature device is included such as any one of claim 1 to 10
Described near-field communication modulation-demodulation circuit.
17. a kind of near field communication tag, it is characterised in that the near field communication tag is included such as any one of claim 1 to 10
Described near-field communication modulation-demodulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720301027.3U CN206819380U (en) | 2017-03-24 | 2017-03-24 | A kind of near-field communication modulation-demodulation circuit, safety chip and dynamic token |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720301027.3U CN206819380U (en) | 2017-03-24 | 2017-03-24 | A kind of near-field communication modulation-demodulation circuit, safety chip and dynamic token |
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| Publication Number | Publication Date |
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| CN206819380U true CN206819380U (en) | 2017-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113962235A (en) * | 2021-10-27 | 2022-01-21 | 维沃移动通信有限公司 | RFID card reading circuit and electronic equipment |
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2017
- 2017-03-24 CN CN201720301027.3U patent/CN206819380U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113962235A (en) * | 2021-10-27 | 2022-01-21 | 维沃移动通信有限公司 | RFID card reading circuit and electronic equipment |
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