CN104156760A - Electronic tag and demodulator thereof - Google Patents
Electronic tag and demodulator thereof Download PDFInfo
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- CN104156760A CN104156760A CN201410356573.8A CN201410356573A CN104156760A CN 104156760 A CN104156760 A CN 104156760A CN 201410356573 A CN201410356573 A CN 201410356573A CN 104156760 A CN104156760 A CN 104156760A
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Abstract
The invention discloses an electronic tag and a demodulator thereof. The demodulator comprises a first signal branch circuit, a second signal branch circuit and a comparator, wherein the input end of the first signal branch circuit is taken as the an RF signal input end, and used for receiving RF signals; the input end of the second signal branch circuit is connected with the input end of the first signal branch circuit; the positive input end and the negative input end are respectively connected with the output ends of the second signal branch circuit and the first signal branch circuit; the output ends of the positive input end and the negative input end are used for outputting demodulated data; the first signal branch circuit is connected with a first wave detector, a first primary wave filter and a secondary wave filter in series in sequence; the first wave detector consists of a capacitor and a one-way conducting element I; the second signal branch circuit is connected with a second wave detector and a second primary wave filter; the second wave detector consists of a capacitor partial pressure network and a one-way conducting element II. Through the application of the electronic tag and the demodulator thereof, the sensitivity of the demodulation can be improved.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of electronic tag and detuner thereof.
Background technology
RFID (Radio frequency identification, 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 mainly sends the signal of ASK (amplitude shift keying, amplitude shift keying) modulation by modulation external electromagnetic field to electronic tag; Then, electronic tag carries out demodulation by its inner detuner to the ASK signal receiving, thus the data of obtaining.
At present, the existing detuner existing 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 data of the output terminal output demodulation of hysteresis comparator 04.
Like this, when RF signal is after wave detector 01 multiplication of voltage detection, through one-level wave filter 02, obtain the first base band low frequency envelope signal (A point signal), from the positive input input of hysteresis comparator 04; And first base band low frequency envelope signal after two-stage filter 03, obtain the second base band low frequency envelope signal (B point signal), and from the negative input input of hysteresis comparator 04.In practical application, because the bandwidth of 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, compares the voltage of first, second base band low frequency envelope signal through hysteresis comparator 04, and demodulation obtains data.
Yet in fact, owing to being continuously height at RF signal or being continuously when low, the voltage of first, second base band low frequency envelope signal equates; When the retarding window of hysteresis comparator is certain, the RF signal of RF signal input part is when weak, the voltage difference of first, second base band low frequency envelope signal may not reach retarding window, hysteresis comparator 04 also just cannot demodulate data; And when RF signal converts when 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 slowly or be weak, existing detuner possibly cannot demodulate data, and sensitivity is not high.Therefore, be necessary to provide the higher electronic tag of a kind of sensitivity and detuner thereof.
Summary of the invention
The defect existing for above-mentioned prior art, the embodiment of the present invention provides a kind of electronic tag and detuner thereof, in order to realize the demodulation in the weak situation of RF signal, improves demodulation sensitivity.
The embodiment of the present invention provides the detuner in a kind of electronic tag, comprising:
First signal branch road, its input end is used for receiving RF signal as RF signal input part;
Secondary signal branch road, its input end is connected with the input end of first signal branch road;
Comparer, it is positive and negative is connected with the output terminal of second, one signal branch respectively to input end, the data of its output terminal output demodulation;
Wherein, in first signal branch road, be serially connected with successively: first detector, the first elementary wave filter, two-stage filter; Wherein, first detector is comprised of electric capacity and one-way conduction element;
In secondary signal branch road, be serially connected with successively: second detector, the second elementary wave filter; Wherein, second detector is comprised of capacitance partial pressure network and one-way conduction element.
Preferably, described first detector specifically comprises: capacitor C 1a and as the field effect transistor M2 of one-way conduction element; Wherein,
One end of capacitor C 1a is as the input end of first detector; The other end of capacitor C 1a 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 elementary wave filter specifically comprises: capacitor C 3a and resistance R 3a; Wherein,
One end of resistance R 3a is connected with the drain electrode of field effect transistor M2, as the input end of the first elementary wave filter and the output terminal of first detector, is connected; The other end of resistance R 3a is connected with one end of capacitor C 3a, as the output terminal of the first elementary wave filter; The other end ground connection of capacitor C 3a.
Preferably, described secondary filter implement body comprises: capacitor C 4 and resistance R 4; Wherein,
One end of resistance R 4 is connected with the output terminal of the first elementary wave filter as the input end of two-stage filter; The other end of resistance R 4 is connected with one end of capacitor C 4, as the output terminal of two-stage filter and the negative input of described comparer, is connected; The other end ground connection of capacitor C 4.
Preferably, described second detector specifically comprises: capacitance partial pressure network and as the field effect transistor M1 of one-way conduction element; Wherein,
Described capacitance partial pressure network specifically comprises: capacitor C 1b and capacitor C 2; Wherein,
One end of capacitor C 1b is connected as the input end of second detector and the input end of first detector; The other end of capacitor C 1b is connected with capacitor C 2, as the output terminal of described capacitance partial pressure network; The other end ground connection of capacitor C 2;
The output terminal of described capacitance partial pressure 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 elementary wave filter specifically comprises: capacitor C 3b and resistance R 3b; Wherein,
One end of resistance R 3b is connected with the drain electrode of field effect transistor M1, as the input end of the second elementary wave filter and the output terminal of second detector, is connected; The other end of resistance R 3b is connected with one end of capacitor C 3b, as the output terminal of the second elementary wave filter; The other end ground connection of capacitor C 3b.
Preferably, the capacitor C 3b in the second elementary wave filter equates with the capacitance of capacitor C 3a in the first elementary wave filter; And second resistance R 3b in elementary wave filter equate with the resistance value of resistance R 3a in the first elementary wave filter.
Preferably, capacitor C 1a equates with the capacitance of capacitor C 1b.
Preferably, the grid of field effect transistor M2 is connected with the grid of field effect transistor M1.
The embodiment of the present invention also provides a kind of electronic tag, comprising: above-mentioned detuner.
In technical scheme of the present invention, the same RF signal that detuner in electronic tag utilizes first signal branch road, secondary signal branch road respectively RF signal input part to be received carries out after 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 variation of the first baseband signal simultaneously lags behind the variation of the second baseband signal, like this, through comparer relatively after, can demodulate the data in RF signal.And, in technical scheme of the present invention, by adopting different intrinsic standoff ratios, can control the first baseband signal of two input end inputs of comparer and the voltage extent between the second baseband signal, while making RF signal weak, comparer also can identify the voltage difference between two-way baseband signal, has improved 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 detuner of the electronic tag of the embodiment of the present invention;
Fig. 3 is the circuit theory diagrams of detuner of the electronic tag of the embodiment of the present invention;
Fig. 4 a is the demodulation schematic diagram of the RF signal of embodiment of the present invention detuner when weak;
Fig. 4 b is the demodulation schematic diagram of the RF signal of embodiment of the present invention detuner when stronger.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, it should be noted that, many details of listing in instructions are only used to make reader to have a thorough understanding to one or more aspects of the present invention, even if do not have these specific details also can realize these aspects of the present invention.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant to computing machine, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on processor, processor, object, executable program, execution, program and/or computing machine.For instance, the application program of moving on computing equipment and this computing equipment can be modules.One or more modules can be positioned at an executory process and/or thread.
In technical scheme of the present invention, detuner in electronic tag can be distinguished detection, filtering from two signal branch to the RF signal receiving, and with this, forms the two-way baseband signal that bandwidth difference, pace of change difference and pressure reduction regulate automatically according to the power of RF signal.Like this, comparer also can compare the two-way baseband signal of input when RF signal is weak, demodulates data, avoid when the voltage amplitude of RF signal a little less than time None-identified go out pressure reduction and then problem that cannot demodulation, improved the demodulation sensitivity of detuner.
Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail.
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: first signal branch road 10, secondary signal branch road 20 and comparer 30.
Wherein, the input end of first signal branch road 10 is used for receiving RF signal as RF signal input part; The input end of secondary signal branch road 20 is connected with the input end of first signal branch road 10, and the input end of the input end of secondary signal branch road 20 and first signal branch road 10 is used 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 first signal branch road 10, the data of output terminal output demodulation.
In practical application, in first signal branch road 10, be serially connected with successively: the elementary wave filter 102 of first detector 101, first, two-stage filter 103; In secondary signal branch road 20, be serially connected with successively: the elementary wave filter 202 of second detector 201, second; Wherein, the first detector 101 in first signal branch road 10 is comprised of electric capacity and one-way conduction element; Second detector 201 is comprised of capacitance partial pressure network and one-way conduction element.
In the embodiment of the present invention, as shown in Figure 3, the first detector 101 in first signal branch road 10 specifically can comprise: capacitor C 1a and as the field effect transistor M2 of one-way conduction element.Wherein, one end of capacitor C 1a is as the input end of first detector 101; The other end of capacitor C 1a 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 the input end reception RF signal by first detector 101, by capacitor C 1a and field effect transistor M2, RF signal is carried out to detection, from the output terminal of first detector 101, export the first rectified signal of high frequency.
As shown in Figure 3, the first elementary wave filter 102 in first signal branch road 10 specifically can comprise: capacitor C 3a and resistance R 3a.Wherein, one end of resistance R 3a is connected with the drain electrode of field effect transistor M2, as the input end of the first elementary wave filter 102, is connected with the output terminal of first detector 101; The other end of resistance R 3a is connected with one end of capacitor C 3a, as the output terminal of the first elementary wave filter 102; The other end ground connection of capacitor C 3a.Like this, after the first rectified signal of the input end of the first elementary wave filter 102 access first detector 101 outputs, through capacitor C 3a and resistance R 3a, can carry out elementary filtering processing to the first rectified signal of input.
As shown in Figure 3, the two-stage filter 103 in first signal branch road 10 specifically can comprise: capacitor C 4 and resistance R 4.Wherein, one end of resistance R 4 is connected with the output terminal of the first elementary wave filter 102 as the input end of two-stage filter 103; The other end of resistance R 4 is connected with one end of capacitor C 4, as the output terminal of two-stage filter 103, is connected with the negative input of comparer 30; The other end ground connection of capacitor C 4.Like this, the signal of processing through elementary filtering of the first elementary wave filter 102 outputs carries out secondary filtering through capacitor C 4 and resistance R 4 in two-stage filter 103, 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: capacitance partial pressure network and as the field effect transistor M1 of one-way conduction element; Wherein, capacitance partial pressure network specifically comprises: capacitor C 1b and capacitor C 2.Particularly, one end of capacitor C 1b is connected with the input end of first detector 101 as the input end of second detector 201; The other end of capacitor C 1b is connected with capacitor C 2, as the output terminal of capacitance partial pressure network; The other end ground connection of capacitor C 2; And the output terminal of capacitance partial pressure 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 the grid of field effect transistor M1 and the access of the grid of field effect transistor M2 be connected, access identical setting voltage.Capacitor C 1a in first detector 101 equates with the capacitance of capacitor C 1b in second detector 201.
Like this, input end by second detector 201 receives after the identical RF signal receiving with first detector 101, by capacitor C 1b, capacitor C 2 and field effect transistor M1, the RF signal receiving is carried out to dividing potential drop detection, from the output terminal of second detector 201, export the second rectified signal of high frequency.In practical application, due to the dividing potential drop of capacitor C 1b and capacitor C 2, 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 elementary wave filter 202 in secondary signal branch road 20 specifically can comprise: capacitor C 3b and resistance R 3b.Wherein, one end of resistance R 3b is connected with the drain electrode of field effect transistor M1, as the input end of the second elementary wave filter 202, is connected with the output terminal of second detector 201; The other end of resistance R 3b is connected with one end of capacitor C 3b, as the output terminal of the second elementary wave filter 202; The other end ground connection of capacitor C 3b.Like this, after the second rectified signal of the input end of the second elementary wave filter 202 access second detector 201 outputs, through capacitor C 3b and resistance R 3b, can carry out filtering processing to the second rectified signal of input, obtain the second baseband signal of low frequency.
In the embodiment of the present invention, the capacitor C 3b in the second elementary wave filter 202 equates with the capacitance of capacitor C 3a in the first elementary wave filter 102; And second resistance R 3b in elementary wave filter 202 equate with the resistance value of resistance R 3a in the first elementary wave filter 102.Like this, because the amplitude of oscillation of the second rectified signal of the second elementary wave filter 202 accesses is less than the amplitude of oscillation of the first rectified signal of the first elementary wave 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 of the second elementary wave filter 202 outputs is from the positive input input of comparer 30; The first baseband signal of the first elementary wave filter 202 outputs is from the negative input input of comparer 30; Like this, comparer 30 can, according to the first baseband signal of input and the voltage difference between the second baseband signal, demodulate data.
In practical application, when RF signal input part sustainable existence radio-frequency carrier, the 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 first baseband signal and the voltage difference between the second baseband signal are proportional to the intrinsic standoff ratio of capacitor C 1b in first detector 101 (capacitor C 1b equates with the value of capacitor C 1a in second detector 201) and capacitor C 2.That is to say, the voltage difference between the first baseband signal and the second baseband signal will regulate automatically according to the power of the RF signal of RF signal input part.
As shown in Fig. 4 a, 4b, when the RF of RF signal input part signal is weak, detuner provided by the invention can demodulate data according to voltage difference less between the first baseband signal and the second baseband signal, has greatly improved highly sensitive.When the RF of RF signal input part signal 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, because the variation of the second baseband signal lags behind the variation of the first baseband signal, and the bandwidth of the second baseband signal is lower than the bandwidth of the first baseband signal, and it has larger antijamming capability.
In technical scheme of the present invention, the same RF signal that detuner in electronic tag utilizes first signal branch road, secondary signal branch road respectively RF signal input part to be received carries out after 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 variation of the first baseband signal simultaneously lags behind the variation of the second baseband signal, like this, through comparer relatively after, can demodulate the data in RF signal.And, in technical scheme of the present invention, by adopting different intrinsic standoff ratios, can control the first baseband signal of two input end inputs of comparer and the voltage extent between the second baseband signal, while making RF signal weak, comparer also can identify the voltage difference between two-way baseband signal, has improved the sensitivity of detuner.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, 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 road, its input end is used for receiving RF signal as radio frequency rf signal input end;
Secondary signal branch road, its input end is connected with the input end of first signal branch road;
Comparer, it is positive and negative is connected with the output terminal of second, one signal branch respectively to input end, the data of its output terminal output demodulation;
Wherein, in first signal branch road, be serially connected with successively: first detector, the first elementary wave filter, two-stage filter; Wherein, first detector is comprised of electric capacity and one-way conduction element;
In secondary signal branch road, be serially connected with successively: second detector, the second elementary wave filter; Wherein, second detector is comprised of capacitance partial pressure network and one-way conduction element.
2. detuner as claimed in claim 1, is characterized in that, described first detector specifically comprises: capacitor C 1a and as the field effect transistor M2 of one-way conduction element; Wherein,
One end of capacitor C 1a is as the input end of first detector; The other end of capacitor C 1a 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, is characterized in that, the first elementary wave filter specifically comprises: capacitor C 3a and resistance R 3a; Wherein,
One end of resistance R 3a is connected with the drain electrode of field effect transistor M2, as the input end of the first elementary wave filter and the output terminal of first detector, is connected; The other end of resistance R 3a is connected with one end of capacitor C 3a, as the output terminal of the first elementary wave filter; The other end ground connection of capacitor C 3a.
4. detuner as claimed in claim 3, is characterized in that, described secondary filter implement body comprises: capacitor C 4 and resistance R 4; Wherein,
One end of resistance R 4 is connected with the output terminal of the first elementary wave filter as the input end of two-stage filter; The other end of resistance R 4 is connected with one end of capacitor C 4, as the output terminal of two-stage filter and the negative input of described comparer, is connected; The other end ground connection of capacitor C 4.
5. detuner as claimed in claim 1, is characterized in that, described second detector specifically comprises: capacitance partial pressure network and as the field effect transistor M1 of one-way conduction element; Wherein,
Described capacitance partial pressure network specifically comprises: capacitor C 1b and capacitor C 2; Wherein,
One end of capacitor C 1b is connected as the input end of second detector and the input end of first detector; The other end of capacitor C 1b is connected with capacitor C 2, as the output terminal of described capacitance partial pressure network; The other end ground connection of capacitor C 2;
The output terminal of described capacitance partial pressure 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, is characterized in that, the second elementary wave filter specifically comprises: capacitor C 3b and resistance R 3b; Wherein,
One end of resistance R 3b is connected with the drain electrode of field effect transistor M1, as the input end of the second elementary wave filter and the output terminal of second detector, is connected; The other end of resistance R 3b is connected with one end of capacitor C 3b, as the output terminal of the second elementary wave filter; The other end ground connection of capacitor C 3b.
7. detuner as claimed in claim 6, is characterized in that, the capacitor C 3b in the second elementary wave filter equates with the capacitance of capacitor C 3a in the first elementary wave filter; And second resistance R 3b in elementary wave filter equate with the resistance value of resistance R 3a in the first elementary wave filter.
8. detuner as claimed in claim 6, is characterized in that, capacitor C 1a equates with the capacitance of capacitor C 1b.
9. detuner as claimed in claim 6, 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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| CN107735990A (en) * | 2015-06-15 | 2018-02-23 | 意法半导体国际有限公司 | Demodulator circuit and the method for demodulation |
| CN113489165A (en) * | 2021-05-26 | 2021-10-08 | 广东高标电子科技有限公司 | Non-contact type rotating body electric energy transmission and communication device and electric moped |
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| 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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| CN107735990A (en) * | 2015-06-15 | 2018-02-23 | 意法半导体国际有限公司 | Demodulator circuit and the method for demodulation |
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| CN113489165A (en) * | 2021-05-26 | 2021-10-08 | 广东高标电子科技有限公司 | Non-contact type rotating body electric energy transmission and communication device and electric moped |
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