CN206541324U - A kind of demodulator circuit suitable for RFID tag - Google Patents
A kind of demodulator circuit suitable for RFID tag Download PDFInfo
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- CN206541324U CN206541324U CN201720091800.8U CN201720091800U CN206541324U CN 206541324 U CN206541324 U CN 206541324U CN 201720091800 U CN201720091800 U CN 201720091800U CN 206541324 U CN206541324 U CN 206541324U
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Abstract
The utility model embodiment discloses a kind of demodulator circuit suitable for RFID tag, including：Envelope detection circuit, sends to the two-way aerial signal (In1, In2) of RFID tag, and obtain antenna envelope signal (Out1) for extracting；Average generation circuit, is connected to the envelope detection circuit, for producing two-way comparison signal (Out2, Out3) according to the antenna envelope signal (Out1)；Comparison circuit, is connected to the average generation circuit, is compared for the two-way comparison signal (Out2, Out3) to input, and then produces comparative result (Out4)；And shaping circuit, the comparison circuit is connected to, for carrying out shaping to the comparative result (Out4), so as to export demodulated signal (Out).The dynamic range for improving demodulation that the utility model is provided, and small power consumption, stability are good, sensitivity is high.
Description
Technical field
The utility model is related to technical field of RFID, more particularly to a kind of demodulator circuit suitable for RFID tag.
Background technology
Radio frequency identification (Radio Frequency Identification, RFID) is a kind of without contact, passes through near field
Inductive or the Electromagnetic Wave Propagation in far field realize the technology of object identification and data communication.Passive ultra-high frequency RFID technology energy
A large amount of low cost, Large Copacity, small size, the labels of high-speed are provided, are widely used in retail, medical treatment ＆ health, Internet of Things, money
The field such as production management and consumer electronics.
In RFID technique, the communication between reader and label is as follows：Reader passes through after first data are modulated
Electromagnetic wave is sent, and RFID tag enters needs that modulated data is demodulated to come behind the launching site of reader, is read so as to receive
Read data and instruction that device is sent.
At present, the demodulator circuit of RFID tag is small in the presence of demodulation dynamic range, it is impossible to handle lacking for wide variation signal
Fall into.
Utility model content
The utility model embodiment technical problem to be solved is, is demodulated for the demodulator circuit of existing RFID tag
There is provided a kind of demodulation that demodulation dynamic range is big, low in energy consumption, sensitivity is high suitable for RFID tag for the small defect of dynamic range
Circuit.
In order to solve the above-mentioned technical problem, the utility model embodiment provides a kind of demodulation electricity suitable for RFID tag
Road, including：Envelope detection circuit, sends to the two-way aerial signal of RFID tag, and obtain antenna envelope signal for extracting；
Average generation circuit, is connected to the envelope detection circuit, for producing two-way comparison signal according to the antenna envelope signal；
Comparison circuit, is connected to the average generation circuit, is compared for the two-way comparison signal to input, and then produces
Comparative result；And shaping circuit, the comparison circuit is connected to, for carrying out shaping to the comparative result, so as to export
Demodulated signal.
Preferably, the envelope detection circuit includes：Four diode D1~D4, electric capacity C1 and C2, PMOS MP1,
NMOS tube MN1 and resistance R1；Diode D1 and D3 anode are respectively connecting to aerial signal all the way, diode D1 negative electrode connection
To electric capacity C1 one end, diode D3 negative electrode is connected to the other end and the ground connection of electric capacity；Diode D2 and D4 anode difference
Another road aerial signal is connected to, diode D2 negative electrode is connected to diode D1 negative electrode, and diode D4 negative electrode is connected to
Diode D3 negative electrode；PMOS MP1 drain electrode is connected to diode D1 negative electrode, PMOS MP1 grid and source electrode connection
And it is connected to resistance R1 one end, the grid of NMOS tube, resistance R1 other end ground connection；NMOS tube MN1 drain electrode is connected to two
Pole pipe D1 negative electrode, NMOS tube source ground；Electric capacity C2 one end is connected to NMOS tube MN1 drain electrode, the electric capacity C2 other end
Ground connection；NMOS tube MN1 drain electrode exports antenna envelope signal (Out1) to the average generation circuit.
Preferably, the average generation circuit includes:Electric capacity C3 and resistance R2；The antenna envelope signal (Out1) is defeated
Enter to resistance R2 one end, the resistance R2 other end is connected to electric capacity C3 one end, electric capacity C3 other end ground connection；The two-way
Comparison signal (Out2, Out3) is exported from resistance R2 two ends respectively.
Preferably, the comparison circuit includes comparator chip, and the input of comparator chip receives the two-way respectively
Comparison signal (Out2, Out3), the output signal (Out4) of comparator chip is inputted to the input of the shaping circuit.
Preferably, the shaping circuit includes：PMOS MP2 and MP3, NMOS tube MN2 and MN3；PMOS MP2 and NMOS
Pipe MN2 grid receives the output signal (Out4) of comparator respectively, and PMOS MP2 and MP3 drain electrode are connected to supply voltage
(VDD), PMOS MP2 source electrode is respectively connecting to the grid of NMOS tube MN2 drain electrode, MN3 grid and PMOS MP3,
NMOS tube MN2 and MN3 source ground, NMOS tube MN3 drain electrode are connected to PMOS MP3 source electrode；Demodulated signal (Out) from
MNOS pipes MN3 drain electrode output.
Implement the utility model embodiment, have the advantages that：The utility model is extracted by envelope detection circuit
Circuit obtains envelope signal from two-way antenna voltage signals, obtains two-way envelope signal using average generation circuit, then be input to
Envelope signal change edge is obtained in comparison circuit, shaping finally is carried out to modulated signal by shaping circuit, has prevented antenna bag
Influence of the overshoot of network signal to demodulator circuit, improves the precision of demodulation, obtains more preferable modulated signal waveform, and relatively more electric
Road uses the comparator chip of HDR so that the dynamic range of demodulation is big.The utility model demodulator circuit also has work(
The consumption advantage that low, sensitivity is high, stability is good.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the first embodiment demodulator circuit block diagram that the utility model is provided；
Fig. 2 is the envelope detection circuit structure chart that the utility model is provided；
Fig. 3 is the average generation circuit structure chart that the utility model is provided；
Fig. 4 is the shaping circuit structure chart that the utility model is provided.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
As shown in figure 1, the demodulator circuit 100 that the first embodiment that the utility model is provided is applied to RFID tag includes：
Envelope detection circuit 10, average generation circuit 20, comparison circuit 30 and shaping circuit 40.
Envelope detection circuit 10, which is used to extract, to be sent to two-way aerial signal In1, In2 of RFID tag, and obtains antenna
Envelope signal Out1.Average generation circuit 20 is connected to envelope detection circuit 10, for being produced according to antenna envelope signal Out1
Two-way comparison signal Out2, Out3.Comparison circuit 30 is connected to average generation circuit 20, for the two-way comparison signal to input
Out2, Out3 are compared, and then produce comparative result Out4.Shaping circuit 40 is connected to comparison circuit 30, for comparing
As a result Out4 carries out shaping, so as to export demodulated signal Out.
Specifically, as shown in Fig. 2 envelope detection circuit 10 includes：Four diode D1~D4, electric capacity C1 and C2, PMOS
Pipe MP1, NMOS tube MN1 and resistance R1.Diode D1 and D3 anode are respectively connecting to aerial signal In2 all the way, diode D1
Negative electrode be connected to electric capacity C1 one end, diode D3 negative electrode is connected to the other end and the ground connection of electric capacity.Diode D2 and D4
Anode be respectively connecting to another road aerial signal In1, diode D2 negative electrode is connected to diode D1 negative electrode, diode D4
Negative electrode be connected to diode D3 negative electrode.PMOS MP1 drain electrode is connected to diode D1 negative electrode, PMOS MP1 grid
Pole and source electrode connect and are connected to resistance R1 one end, the grid of NMOS tube, resistance R1 other end ground connection.NMOS tube MN1's
Drain electrode is connected to diode D1 negative electrode, NMOS tube source ground；Electric capacity C2 one end is connected to NMOS tube MN1 drain electrode, electricity
Hold C2 other end ground connection.NMOS tube MN1 drain electrode exports antenna envelope signal (Out1) to average generation circuit 20.
In envelope detection circuit 10, diode D1-D4 is all-wave shaping circuit, and two-way aerial signal In1, In2 are entered
Row AC-DC is changed, then by electric capacity C1, PMOS MP1 and resistance R1 filtering process, then by electric capacity C2 secondary filter
Ripple, the good first via antenna envelope signal Out1 (or Out2) of output performance to comparison circuit 30.
Specifically, as shown in figure 3, average generation circuit 20 includes:Electric capacity C3 and resistance R2.First via antenna envelope is believed
Number Out1 is inputted to resistance R2 one end, and the resistance R2 other end is connected to electric capacity C3 one end, electric capacity C3 other end ground connection；
The two-way comparison signal (Out2, Out3) exports from resistance R2 two ends respectively.
Average generation circuit 20 is a low pass filter.First via antenna envelope signal Out1 produces electricity by average again
Road 20 obtains No. second antenna envelope signal Out3 after filtering.First via antenna envelope signal Out1 is than No. second antenna envelope letter
Number one-stage low-pass filter is undergone less, so first via antenna envelope signal Out1 relatively quickly can follow aerial voltage to believe
The change of number envelope, and one-stage low-pass filter processing is experienced No. second antenna envelope signal Out3 more, therefore envelope signal
Change is more slow.Antenna envelope signal carries the data message sent, shows as the change of envelope signal, when antenna bag
When network level declines, the voltage of the voltage ratio first via antenna envelope signal of No. second antenna envelope signal is high, when antenna envelope
When level rises, the voltage of the voltage ratio first via envelope signal of No. second antenna envelope signal is low, utilizes the first via and second
The voltage difference that road two-way antenna envelope signal is produced in antenna envelope variation, it is possible to detect the data letter that reader is sent
Number.
Specifically, comparison circuit 30 includes comparator chip.The input of comparator chip receives two-way and compares letter respectively
Number Out2, Out3, the output signal Out4 of comparator chip are inputted to the input of shaping circuit 40.That is, the first via
Antenna envelope signal Out1 (or Out2) and No. second antenna envelope signal Out3 are input to two inputs of comparison circuit 30
End, comparison circuit 30 detects the data-signal that reader is sent, and then produce according to the voltage difference of two-way antenna envelope signal
Comparative result Out4.Comparator chip can select the comparator chip of the available chip of in the market, preferably HDR.
Specifically, as shown in figure 4, shaping circuit 30 includes：PMOS MP2 and MP3, NMOS tube MN2 and MN3.PMOS
MP2 and NMOS tube MN2 grid receive the output signal Out4 of comparator respectively, and PMOS MP2 and MP3 drain electrode are connected to confession
Piezoelectric voltage (VDD), PMOS MP2 source electrode is respectively connecting to NMOS tube MN2 drain electrode, MN3 grid and PMOS MP3
Grid, NMOS tube MN2 and MN3 source ground, NMOS tube MN3 drain electrode is connected to PMOS MP3 source electrode.Demodulated signal
Out is exported from MNOS pipes MN3 drain electrode.
In shaping circuit 30, metal-oxide-semiconductor MP2, MP3, MN2 and MN3 constitute phase inverter, the demodulation by phase inverter to output
Signal carries out shaping.
The utility model extracts circuit by envelope detection circuit and obtains envelope signal from two-way antenna voltage signals, utilizes
Average generation circuit obtains two-way envelope signal, then be input in comparison circuit obtain envelope signal change edge, finally by whole
Shape circuit carries out shaping to modulated signal, has prevented influence of the overshoot to demodulator circuit of antenna envelope signal, improves demodulation
Precision, obtains more preferable modulated signal waveform, and comparison circuit uses the comparator chip of HDR so that demodulation
Dynamic range is big.The utility model demodulator circuit also has the advantage that low in energy consumption, sensitivity is high, stability is good.
Above disclosed is only a kind of preferred embodiment of the utility model, can not limit this practicality with this certainly
New interest field, one of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to
The equivalent variations that the utility model claim is made, still fall within the scope that utility model is covered.
Claims (5)
1. a kind of demodulator circuit suitable for RFID tag, it is characterised in that including：
Envelope detection circuit, sends to the two-way aerial signal (In1, In2) of RFID tag, and obtain antenna envelope for extracting
Signal (Out1)；
Average generation circuit, is connected to the envelope detection circuit, for producing two according to the antenna envelope signal (Out1)
Road comparison signal (Out2, Out3)；
Comparison circuit, is connected to the average generation circuit, enters for the two-way comparison signal (Out2, Out3) to input
Row compares, and then produces comparative result (Out4)；And
Shaping circuit, is connected to the comparison circuit, for carrying out shaping to the comparative result (Out4), so as to export demodulation
Signal (Out).
2. the demodulator circuit according to claim 1 suitable for RFID tag, it is characterised in that the envelope detection circuit
Including：Four diode D1~D4, electric capacity C1 and C2, PMOS MP1, NMOS tube MN1 and resistance R1；Diode D1 and D3 sun
Pole is respectively connecting to aerial signal all the way, and diode D1 negative electrode is connected to electric capacity C1 one end, diode D3 negative electrode connection
The other end and ground connection to electric capacity；Diode D2 and D4 anode are respectively connecting to another road aerial signal, diode D2 the moon
Pole is connected to diode D1 negative electrode, and diode D4 negative electrode is connected to diode D3 negative electrode；PMOS MP1 drain electrode connection
To diode D1 negative electrode, PMOS MP1 grid and source electrode connect and are connected to resistance R1 one end, the grid of NMOS tube,
Resistance R1 other end ground connection；NMOS tube MN1 drain electrode is connected to diode D1 negative electrode, NMOS tube source ground；Electric capacity C2
One end be connected to NMOS tube MN1 drain electrode, electric capacity C2 other end ground connection；NMOS tube MN1 drain electrode is by antenna envelope signal
(Out1) export to the average generation circuit.
3. the demodulator circuit according to claim 2 suitable for RFID tag, it is characterised in that the average generation circuit
Including:Electric capacity C3 and resistance R2；The antenna envelope signal (Out1) is inputted to resistance R2 one end, the resistance R2 other end
It is connected to electric capacity C3 one end, electric capacity C3 other end ground connection；The two-way comparison signal (Out2, Out3) is respectively from resistance R2
Two ends output.
4. the demodulator circuit according to claim 3 suitable for RFID tag, it is characterised in that the comparison circuit includes
Comparator chip, the input of comparator chip receives the two-way comparison signal (Out2, Out3) respectively, comparator chip
Output signal (Out4) is inputted to the input of the shaping circuit.
5. the demodulator circuit according to claim 4 suitable for RFID tag, it is characterised in that the shaping circuit bag
Include：PMOS MP2 and MP3, NMOS tube MN2 and MN3；PMOS MP2 and NMOS tube MN2 grid receive the defeated of comparator respectively
Go out signal (Out4), PMOS MP2 and MP3 drain electrode are connected to supply voltage (VDD), and PMOS MP2 source electrode is connected respectively
The grid of drain electrode, MN3 to NMOS tube MN2 and PMOS MP3 grid, NMOS tube MN2 and MN3 source ground, NMOS
Pipe MN3 drain electrode is connected to PMOS MP3 source electrode；The demodulated signal (Out) exports from MNOS pipes MN3 drain electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720091800.8U CN206541324U (en) | 2017-01-22 | 2017-01-22 | A kind of demodulator circuit suitable for RFID tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720091800.8U CN206541324U (en) | 2017-01-22 | 2017-01-22 | A kind of demodulator circuit suitable for RFID tag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206541324U true CN206541324U (en) | 2017-10-03 |
Family
ID=59939774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720091800.8U Active CN206541324U (en) | 2017-01-22 | 2017-01-22 | A kind of demodulator circuit suitable for RFID tag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206541324U (en) |
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2017
- 2017-01-22 CN CN201720091800.8U patent/CN206541324U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 511458 Nansha District, Guangzhou, Guangdong Province, No. 2 Huanshi Avenue South, Software South Building 3003, Guangzhou Nansha Information Technology Park Patentee after: Guangzhou Xinshiwu Technology Co., Ltd. Address before: 511458 Nansha District, Guangzhou, Guangdong Province, No. 2 Huanshi Avenue South, Software South Building 3003, Guangzhou Nansha Information Technology Park Patentee before: Guangzhou World Heritage Mdt InfoTech Ltd |
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| CP01 | Change in the name or title of a patent holder |