CN104156760B - Electronic tag and detuner thereof - Google Patents
Electronic tag and detuner thereof Download PDFInfo
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- CN104156760B CN104156760B CN201410356573.8A CN201410356573A CN104156760B CN 104156760 B CN104156760 B CN 104156760B CN 201410356573 A CN201410356573 A CN 201410356573A CN 104156760 B CN104156760 B CN 104156760B
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Abstract
The invention discloses a kind of electronic tag and detuner thereof, described detuner comprises: the first signal branch, its input end as RF signal input part for receiving RF signal; Secondary signal branch road, its input end is connected with the input end of the first signal branch; Comparer, it is positive and negative is connected with the output terminal of second, one signal branch respectively to input end, and its output terminal exports the data of demodulation; Wherein, be serially connected with successively in the first signal branch: first detector, the first preliminary filter, two-stage filter; Wherein, first detector is made up of electric capacity and one-way conduction element; Be serially connected with successively in secondary signal branch road: second detector, the second preliminary filter; Wherein, second detector is made up of capacitive divider network and one-way conduction element.Application the present invention, can improve demodulation sensitivity.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of electronic tag and detuner thereof.
Background technology
RFID (Radiofrequencyidentification, radio-frequency (RF) identification) system is a kind of contactless automatic recognition system, and it at least comprises a read write line and an electronic tag; Read write line sends to electronic tag the signal that ASK (amplitudeshiftkeying, amplitude shift keying) modulates mainly through modulation external electromagnetic field; Then, electronic tag carries out demodulation by the detuner of its inside to the ASK signal received, thus obtains data.
At present, the existing detuner existed in a kind of electronic tag, as shown in Figure 1, comprises wave detector 01, one-level wave filter 02, two-stage filter 03 and hysteresis comparator 04.Wherein, the input end of wave detector 01 is as RF signal input part, and its output terminal is connected with the input end of one-level wave filter 02; The output terminal of one-level wave filter is connected with the input end of two-stage filter 03, the positive input of hysteresis comparator 04 respectively; The output terminal of two-stage filter 03 is connected with the negative input of hysteresis comparator 04; The output terminal of hysteresis comparator 04 exports the data of demodulation.
Like this, when RF signal is after the detection of wave detector 01 multiplication of voltage, through one-level wave filter 02, obtain the first base band low frequency envelope signal (A point signal), input from the positive input of hysteresis comparator 04; And the first base band low frequency envelope signal is after two-stage filter 03, obtains the second base band low frequency envelope signal (B point signal), and input from the negative input of hysteresis comparator 04.In practical application, bandwidth due to two-stage filter 03 is slightly less than the bandwidth of one-level wave filter 02, so, when RF signal is from dying down by force, or during from weak grow, the change in voltage of the second base band low frequency envelope signal is slightly slower than the change in voltage of the first base band low frequency envelope signal, and compare the voltage of first, second base band low frequency envelope signal through hysteresis comparator 04, demodulation obtains data.
But in fact, due to when RF signal is continuously height or is continuously low, the voltage of first, second base band low frequency envelope signal is equal; When the retarding window of hysteresis comparator RF signal that is certain, RF signal input part is more weak, the voltage difference of first, second base band low frequency envelope signal may not reach retarding window, and hysteresis comparator 04 also just cannot demodulate data; And when the conversion of RF signal is slow, due to the voltage of the voltage follow first base band low frequency envelope signal of the second base band low frequency envelope signal, both differences are less, may be less than the retarding window of hysteresis comparator 04, also just cannot demodulate data.
As can be seen here, when RF signal converts slow or more weak, existing detuner possibly cannot demodulate data, and sensitivity is not high.Therefore, the electronic tag being necessary to provide a kind of sensitivity higher and detuner thereof.
Summary of the invention
For the defect that above-mentioned prior art exists, embodiments provide a kind of electronic tag and detuner thereof, in order to realize RF signal more weak when demodulation, improve demodulation sensitivity.
Embodiments provide the detuner in a kind of electronic tag, comprising:
First signal branch, include the first detector, the first preliminary filter and the two-stage filter that are connected in series successively, first detector is made up of electric capacity and one-way conduction element, the input end of the first signal branch as radio frequency rf signal input end for receiving RF signal;
Secondary signal branch road, include the second detector that is connected in series successively and, the second preliminary filter, second detector is made up of capacitive divider network and one-way conduction element, and the input end of secondary signal branch road is connected with the input end of the first signal branch;
First signal branch exports the first baseband signal in response to described RF signal, secondary signal branch road exports the second baseband signal in response to described RF signal, and the bandwidth of the second baseband signal is less than the bandwidth of the first baseband signal and the change of the second baseband signal lags behind the change of the first baseband signal;
Comparer, its positive input is connected to receive the second baseband signal with the output terminal of secondary signal branch road, the negative input of described comparer is connected to receive the first baseband signal with the output terminal of the first signal branch, and described comparer exports the data of demodulation in response to the first baseband signal and the second baseband signal from output terminal.
Preferably, described first detector specifically comprises: electric capacity C1a and the field effect transistor M2 as one-way conduction element; Wherein,
One end of electric capacity C1a is as the input end of first detector; The other end of electric capacity C1a is connected with the drain electrode of field effect transistor M2, as the output terminal of first detector;
The source ground of field effect transistor M2, the grid access setting voltage of field effect transistor M2; Described setting voltage is greater than the cut-in voltage of field effect transistor M2.
Preferably, the first preliminary filter specifically comprises: electric capacity C3a and resistance R3a; Wherein,
One end of resistance R3a is connected with the drain electrode of field effect transistor M2, is connected with the output terminal of first detector as the input end of the first preliminary filter; The other end of resistance R3a is connected with one end of electric capacity C3a, as the output terminal of the first preliminary filter; The other end ground connection of electric capacity C3a.
Preferably, described secondary filter implement body comprises: electric capacity C4 and resistance R4; Wherein,
One end of resistance R4 is connected with the output terminal of the first preliminary filter as the input end of two-stage filter; The other end of resistance R4 is connected with one end of electric capacity C4, and the output terminal as two-stage filter is connected with the negative input of described comparer; The other end ground connection of electric capacity C4.
Preferably, described second detector specifically comprises: capacitive divider network and the field effect transistor M1 as one-way conduction element; Wherein,
Described capacitive divider network specifically comprises: electric capacity C1b and electric capacity C2; Wherein,
One end of electric capacity C1b is connected with the input end of first detector as the input end of second detector; The other end of electric capacity C1b is connected with electric capacity C2, as the output terminal of described capacitive divider network; The other end ground connection of electric capacity C2;
The output terminal of described capacitive divider network is connected with the drain electrode of field effect transistor M1, as the output terminal of second detector;
The source ground of field effect transistor M1, the grid access setting voltage of field effect transistor M1; Described setting voltage is greater than the cut-in voltage of field effect transistor M1.
Preferably, the second preliminary filter specifically comprises: electric capacity C3b and resistance R3b; Wherein,
One end of resistance R3b is connected with the drain electrode of field effect transistor M1, is connected with the output terminal of second detector as the input end of the second preliminary filter; The other end of resistance R3b is connected with one end of electric capacity C3b, as the output terminal of the second preliminary filter; The other end ground connection of electric capacity C3b.
Preferably, the electric capacity C3b in the second preliminary filter is equal with the capacitance of the electric capacity C3a in the first preliminary filter; And second resistance R3b in preliminary filter equal with the resistance value of the resistance R3a in the first preliminary filter.
Preferably, electric capacity C1a is equal with the capacitance of electric capacity C1b.
Preferably, the grid of field effect transistor M2 is connected with the grid of field effect transistor M1.
The embodiment of the present invention additionally provides a kind of electronic tag, comprising: above-mentioned detuner.
In technical scheme of the present invention, after the same RF signal that detuner in electronic tag utilizes the first signal branch, secondary signal branch road to receive RF signal input part respectively carries out detection, filtering, produce first, second baseband signal of different bandwidth, voltage difference between two-way baseband signal regulates automatically according to the power of RF signal, the change of the second baseband signal simultaneously lags behind the change of the first baseband signal, like this, through comparer relatively after, the data in RF signal can be demodulated.And, in technical scheme of the present invention, by adopting different intrinsic standoff ratios, the voltage extent between the first baseband signal of comparer two input end inputs and the second baseband signal can be controlled, when making RF signal more weak, comparer also can identify the voltage difference between two-way baseband signal, improves the sensitivity of detuner.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the detuner of existing electronic tag;
Fig. 2 is the block diagram of the detuner of the electronic tag of the embodiment of the present invention;
Fig. 3 is the circuit theory diagrams of the detuner of the electronic tag of the embodiment of the present invention;
Fig. 4 a be the RF signal of the embodiment of the present invention more weak time detuner demodulation schematic diagram;
Fig. 4 b be the RF signal of the embodiment of the present invention stronger time detuner demodulation schematic diagram.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in instructions are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
The term such as " module " used in this application, " system " is intended to comprise the entity relevant to computing machine, such as but not limited to hardware, firmware, combination thereof, software or executory software.Such as, module can be, but be not limited in: the thread of the process that processor runs, processor, object, executable program, execution, program and/or computing machine.For example, application program computing equipment run and this computing equipment can be modules.One or more module can be positioned at an executory process and/or thread.
In technical scheme of the present invention, detuner in electronic tag can carry out difference detection, filtering to the RF signal received from two signal branch, forms bandwidth difference, pace of change difference and the two-way baseband signal that automatically regulates according to the power of RF signal of pressure reduction with this.Like this, comparer also can compare the two-way baseband signal of input when RF signal is more weak, demodulates data, avoids the None-identified when the voltage amplitude of RF signal is more weak to go out pressure reduction and then cannot the problem of demodulation, improves the demodulation sensitivity of detuner.
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawing.
A kind of electronic tag that the embodiment of the present invention provides, the inner structure of the detuner that this electronic tag comprises, as shown in Figure 2, specifically comprises: the first signal branch 10, secondary signal branch road 20 and comparer 30.
Wherein, the input end of the first signal branch 10 as RF signal input part for receiving RF signal; The input end of secondary signal branch road 20 is connected with the input end of the first signal branch 10, and namely the input end of secondary signal branch road 20 and the input end of the first signal branch 10 are for receiving same RF signal.
The positive input of comparer 30 is connected with the output terminal of secondary signal branch road 20, and its negative input is connected with the output terminal of the first signal branch 10, and output terminal exports the data of demodulation.
In practical application, be serially connected with successively in the first signal branch 10: first detector 101, first preliminary filter 102, two-stage filter 103; Be serially connected with successively in secondary signal branch road 20: second detector 201, second preliminary filter 202; Wherein, the first detector 101 in the first signal branch 10 is made up of electric capacity and one-way conduction element; Second detector 201 is made up of capacitive divider network and one-way conduction element.
In the embodiment of the present invention, as shown in Figure 3, the first detector 101 in the first signal branch 10 specifically can comprise: electric capacity C1a and the field effect transistor M2 as one-way conduction element.Wherein, one end of electric capacity C1a is as the input end of first detector 101; The other end of electric capacity C1a is connected with the drain electrode of field effect transistor M2, as the output terminal of first detector 101.The source ground of field effect transistor M2, the grid access setting voltage of field effect transistor M2.In practical application, this setting voltage is greater than the cut-in voltage of field effect transistor M2, is specially bias voltage.Like this, after receiving RF signal by the input end of first detector 101, by electric capacity C1a and field effect transistor M2, detection is carried out to RF signal, export the first rectified signal of high frequency from the output terminal of first detector 101.
As shown in Figure 3, the first preliminary filter 102 in the first signal branch 10 specifically can comprise: electric capacity C3a and resistance R3a.Wherein, one end of resistance R3a is connected with the drain electrode of field effect transistor M2, and the input end as the first preliminary filter 102 is connected with the output terminal of first detector 101; The other end of resistance R3a is connected with one end of electric capacity C3a, as the output terminal of the first preliminary filter 102; The other end ground connection of electric capacity C3a.Like this, after the first rectified signal of input end access first detector 101 output of the first preliminary filter 102, elementary filtering process can be carried out to the first rectified signal of input through electric capacity C3a and resistance R3a.
As shown in Figure 3, the two-stage filter 103 in the first signal branch 10 specifically can comprise: electric capacity C4 and resistance R4.Wherein, one end of resistance R4 is connected with the output terminal of the first preliminary filter 102 as the input end of two-stage filter 103; The other end of resistance R4 is connected with one end of electric capacity C4, and the output terminal as two-stage filter 103 is connected with the negative input of comparer 30; The other end ground connection of electric capacity C4.Like this, the electric capacity C4 of the signal through elementary filtering process in two-stage filter 103 that the first preliminary filter 102 exports and resistance R4 carries out secondary filtering, obtains the first baseband signal of low frequency.
As shown in Figure 3, the second detector 201 in secondary signal branch road 20 specifically can comprise: capacitive divider network and the field effect transistor M1 as one-way conduction element; Wherein, capacitive divider network specifically comprises: electric capacity C1b and electric capacity C2.Particularly, one end of electric capacity C1b is connected with the input end of first detector 101 as the input end of second detector 201; The other end of electric capacity C1b is connected with electric capacity C2, as the output terminal of capacitive divider network; The other end ground connection of electric capacity C2; And the output terminal of capacitive divider network is connected with the drain electrode of field effect transistor M1, as the output terminal of second detector 201; The source ground of field effect transistor M1, the grid access setting voltage of field effect transistor M1.In practical application, this setting voltage is greater than the cut-in voltage of field effect transistor M1, is specially bias voltage.
More preferably, can access with the grid of field effect transistor M2 and be connected by the grid of field effect transistor M1, access identical setting voltage.Electric capacity C1a in first detector 101 is equal with the capacitance of the electric capacity C1b in second detector 201.
Like this, after receiving by the input end of second detector 201 the identical RF signal received with first detector 101, by electric capacity C1b, electric capacity C2 and field effect transistor M1, dividing potential drop detection is carried out to the RF signal received, export the second rectified signal of high frequency from the output terminal of second detector 201.In practical application, due to the dividing potential drop of electric capacity C1b and electric capacity C2, the amplitude of oscillation of the second rectified signal is less than the amplitude of oscillation of the first rectified signal.
As shown in Figure 3, the second preliminary filter 202 in secondary signal branch road 20 specifically can comprise: electric capacity C3b and resistance R3b.Wherein, one end of resistance R3b is connected with the drain electrode of field effect transistor M1, and the input end as the second preliminary filter 202 is connected with the output terminal of second detector 201; The other end of resistance R3b is connected with one end of electric capacity C3b, as the output terminal of the second preliminary filter 202; The other end ground connection of electric capacity C3b.Like this, after the second rectified signal of input end access second detector 201 output of the second preliminary filter 202, filtering process can be carried out to the second rectified signal of input through electric capacity C3b and resistance R3b, obtain the second baseband signal of low frequency.
In the embodiment of the present invention, the electric capacity C3b in the second preliminary filter 202 is equal with the capacitance of the electric capacity C3a in the first preliminary filter 102; And second resistance R3b in preliminary filter 202 equal with the resistance value of the resistance R3a in the first preliminary filter 102.Like this, the amplitude of oscillation due to the second rectified signal of the second preliminary filter 202 access is less than the amplitude of oscillation of the first rectified signal that the first preliminary filter 102 accesses, so, the voltage swing of the second baseband signal is also less than the voltage swing of the first baseband signal, and the voltage max of the second baseband signal is lower than the voltage max of the first baseband signal.
Further, the second baseband signal that the second preliminary filter 202 exports inputs from the positive input of comparer 30; The first baseband signal that first preliminary filter 202 exports inputs from the negative input of comparer 30; Like this, comparer 30 according to the voltage difference between the first baseband signal of input and the second baseband signal, can demodulate data.
In practical application, when RF signal input part sustainable existence radio-frequency carrier, first baseband signal and the second baseband signal are continuously high level, the bandwidth of the second baseband signal is lower than the bandwidth of the first baseband signal, and the voltage difference between the first baseband signal with the second baseband signal is proportional to the intrinsic standoff ratio of electric capacity C1b in first detector 101 (electric capacity C1b is equal with the value of electric capacity C1a in second detector 201) and electric capacity C2.That is, the power of the RF signal according to RF signal input part regulates by voltage difference between the first baseband signal and the second baseband signal automatically.
As shown in Fig. 4 a, 4b, when the RF signal of RF signal input part is more weak, detuner provided by the invention can demodulate data according to voltage difference less between the first baseband signal and the second baseband signal, substantially increases highly sensitive.When the RF signal of RF signal input part is stronger, detuner provided by the invention can demodulate data according to voltage difference larger between the first baseband signal and the second baseband signal, change due to the second baseband signal lags behind the change of the first baseband signal, and the bandwidth of the second baseband signal is lower than the bandwidth of the first baseband signal, it has larger antijamming capability.
In technical scheme of the present invention, after the same RF signal that detuner in electronic tag utilizes the first signal branch, secondary signal branch road to receive RF signal input part respectively carries out detection, filtering, produce first, second baseband signal of different bandwidth, voltage difference between two-way baseband signal regulates automatically according to the power of RF signal, the change of the second baseband signal simultaneously lags behind the change of the first baseband signal, like this, through comparer relatively after, the data in RF signal can be demodulated.And, in technical scheme of the present invention, by adopting different intrinsic standoff ratios, the voltage extent between the first baseband signal of comparer two input end inputs and the second baseband signal can be controlled, when making RF signal more weak, comparer also can identify the voltage difference between two-way baseband signal, improves the sensitivity of detuner.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, this program can be stored in computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the detuner in electronic tag, is characterized in that, comprising:
First signal branch, include the first detector, the first preliminary filter and the two-stage filter that are connected in series successively, first detector is made up of electric capacity and one-way conduction element, the input end of the first signal branch as radio frequency rf signal input end for receiving RF signal;
Secondary signal branch road, include the second detector and the second preliminary filter that are connected in series successively, second detector is made up of capacitive divider network and one-way conduction element, and the input end of secondary signal branch road is connected with the input end of the first signal branch;
First signal branch exports the first baseband signal in response to described RF signal, secondary signal branch road exports the second baseband signal in response to described RF signal, and the bandwidth of the second baseband signal is less than the bandwidth of the first baseband signal and the change of the second baseband signal lags behind the change of the first baseband signal;
Comparer, its positive input is connected to receive the second baseband signal with the output terminal of secondary signal branch road, the negative input of described comparer is connected to receive the first baseband signal with the output terminal of the first signal branch, and described comparer exports the data of demodulation in response to the first baseband signal and the second baseband signal from output terminal.
2. detuner as claimed in claim 1, it is characterized in that, described first detector specifically comprises: electric capacity C1a and the field effect transistor M2 as one-way conduction element; Wherein,
One end of electric capacity C1a is as the input end of first detector; The other end of electric capacity C1a is connected with the drain electrode of field effect transistor M2, as the output terminal of first detector;
The source ground of field effect transistor M2, the grid access setting voltage of field effect transistor M2; Described setting voltage is greater than the cut-in voltage of field effect transistor M2.
3. detuner as claimed in claim 2, it is characterized in that, the first preliminary filter specifically comprises: electric capacity C3a and resistance R3a; Wherein,
One end of resistance R3a is connected with the drain electrode of field effect transistor M2, is connected with the output terminal of first detector as the input end of the first preliminary filter; The other end of resistance R3a is connected with one end of electric capacity C3a, as the output terminal of the first preliminary filter; The other end ground connection of electric capacity C3a.
4. detuner as claimed in claim 3, it is characterized in that, described secondary filter implement body comprises: electric capacity C4 and resistance R4; Wherein,
One end of resistance R4 is connected with the output terminal of the first preliminary filter as the input end of two-stage filter; The other end of resistance R4 is connected with one end of electric capacity C4, and the output terminal as two-stage filter is connected with the negative input of described comparer; The other end ground connection of electric capacity C4.
5. detuner as claimed in claim 3, it is characterized in that, described second detector specifically comprises: capacitive divider network and the field effect transistor M1 as one-way conduction element; Wherein,
Described capacitive divider network specifically comprises: electric capacity C1b and electric capacity C2; Wherein,
One end of electric capacity C1b is connected with the input end of first detector as the input end of second detector; The other end of electric capacity C1b is connected with electric capacity C2, as the output terminal of described capacitive divider network; The other end ground connection of electric capacity C2;
The output terminal of described capacitive divider network is connected with the drain electrode of field effect transistor M1, as the output terminal of second detector;
The source ground of field effect transistor M1, the grid access setting voltage of field effect transistor M1; Described setting voltage is greater than the cut-in voltage of field effect transistor M1.
6. detuner as claimed in claim 5, it is characterized in that, the second preliminary filter specifically comprises: electric capacity C3b and resistance R3b; Wherein,
One end of resistance R3b is connected with the drain electrode of field effect transistor M1, is connected with the output terminal of second detector as the input end of the second preliminary filter; The other end of resistance R3b is connected with one end of electric capacity C3b, as the output terminal of the second preliminary filter; The other end ground connection of electric capacity C3b.
7. detuner as claimed in claim 6, it is characterized in that, the electric capacity C3b in the second preliminary filter is equal with the capacitance of the electric capacity C3a in the first preliminary filter; And second resistance R3b in preliminary filter equal with the resistance value of the resistance R3a in the first preliminary filter.
8. detuner as claimed in claim 6, it is characterized in that, electric capacity C1a is equal with the capacitance of electric capacity C1b.
9. detuner as claimed in claim 6, it is characterized in that, the grid of field effect transistor M2 is connected with the grid of field effect transistor M1.
10. an electronic tag, is characterized in that, comprising: the detuner as described in as arbitrary in claim 1-9.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060186995A1 (en) * | 2005-02-22 | 2006-08-24 | Jiangfeng Wu | Multi-protocol radio frequency identification reader tranceiver |
| CN203520443U (en) * | 2013-11-08 | 2014-04-02 | 成都爪媒科技有限公司 | Demodulation circuit used for RFID tag chip |
| CN103927577A (en) * | 2014-04-15 | 2014-07-16 | 重庆西南集成电路设计有限责任公司 | Micropower high-sensitivity demodulator for forming RFID electronic tag and envelope detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060186995A1 (en) * | 2005-02-22 | 2006-08-24 | Jiangfeng Wu | Multi-protocol radio frequency identification reader tranceiver |
| CN203520443U (en) * | 2013-11-08 | 2014-04-02 | 成都爪媒科技有限公司 | Demodulation circuit used for RFID tag chip |
| CN103927577A (en) * | 2014-04-15 | 2014-07-16 | 重庆西南集成电路设计有限责任公司 | Micropower high-sensitivity demodulator for forming RFID electronic tag and envelope detector |
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