CN103326669A - Electronic tag demodulation circuit, demodulation method and electronic tag - Google Patents
Electronic tag demodulation circuit, demodulation method and electronic tag Download PDFInfo
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- CN103326669A CN103326669A CN2012100755623A CN201210075562A CN103326669A CN 103326669 A CN103326669 A CN 103326669A CN 2012100755623 A CN2012100755623 A CN 2012100755623A CN 201210075562 A CN201210075562 A CN 201210075562A CN 103326669 A CN103326669 A CN 103326669A
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Abstract
The invention discloses an electronic tag demodulation circuit which comprises an enveloping wave detection module, a demodulation module and an output shaping module. An enveloping wave signal in radio frequency is converted into a direct current voltage signal through the enveloping wave detection module. The signal is demodulated by means of current comparison in the demodulation module. A current standard is generated by means of dynamic adaptation, so that the structure of the demodulation circuit is effectively simplified, the power consumption is reduced, the excessive dependence on a standard circuit is avoided, and the demodulation flexibility is effectively improved. Meanwhile, the invention discloses an electronic tag which comprises the electronic tag demodulation circuit and a demodulation method.
Description
Technical field
The present invention relates to a kind of demodulator circuit and demodulation method, relate in particular to a kind of demodulator circuit, demodulation method and electronic tag of electronic tag.
Background technology
Electronic tag adopts the RF acquisition technology, is widely used in ticketing service, logistics, the field such as false proof.Electronic tag is read efficiently, be unable to do without demodulator circuit.At present, the demodulator circuit of electronic tag is realized decoding by voltage or current ratio method mainly based on rectification.Utilize voltage ratio method to realize demodulation, its electric current complex structure, power consumption is larger.
Summary of the invention
The main technical problem to be solved in the present invention is to simplify the structure of electronic tag demodulation circuit, reduces power loss, avoids demodulating process to the dependence of reference current, improves demodulation accuracy.
For solving the problems of the technologies described above, the technical program provides a kind of electronic tag demodulation circuit, comprise envelope detection module and demodulation module, the envelope ripple signal in the described envelope detection module received RF signal, described demodulation module receive the output signal of described envelope detection module and carry out demodulation; Described envelope ripple detection module converts the described envelope ripple signal that receives to d. c. voltage signal and outputs in the described demodulation module; Described demodulation module carries out demodulation and exports restituted signal described d. c. voltage signal by current ratio mode.
Described envelope ripple detection module comprises: individual the first electric capacity of n, 2n the first diode, n the second electric capacity, m the second diode, n, m are the positive integer greater than 1, described the first diode successively forward is serially connected in the first branch road, the positive terminal ground connection of described the first branch road, the negative pole end of described the first branch road are the output of envelope ripple detection module; Along described the first branch road positive terminal to the 1st, 3,5 of negative pole end direction ... the negative pole of 2n-1 described the first diode connects respectively an end of described the first electric capacity; The other end of described the first electric capacity connects antenna reception envelope ripple signal; Along described the first branch road positive terminal to the 2nd, 4,6 of negative pole end direction ... the negative pole of 2n described the first diode connects respectively an end of described the second electric capacity; The other end of described the second electric capacity is ground connection respectively.Described the second diode forward is serially connected in the second branch road, and the positive terminal of described the second branch road connects the negative pole end of described the first branch road, the negative pole end ground connection of described the second branch road.
Further, described electronic tag demodulation circuit can also comprise the output signal that connects demodulation module, is used for the output Shaping module that the output signal of demodulation module is carried out shaping.
Described demodulation module can comprise current reference generation unit and comparison demodulating unit, and wherein, described current reference generation unit is used for by dynamically adapting mode generation current benchmark; Described relatively demodulating unit is used for demodulating by current ratio mode signal and the output of electronic tag.
Further, described current reference generation unit comprises the first current mirroring circuit and the second current mirroring circuit; The source electrode of PMOS pipe connects supply power voltage by Signal-controlled switch in described the first current mirroring circuit, and the input end grounding of described the first current mirroring circuit is for generation of reference current, and output connects the source electrode of PMOS pipe in described the second current mirroring circuit.Described relatively demodulating unit can comprise NMOS pipe, the 2nd NMOS pipe and RC unit; Wherein, described the second current mirroring circuit inputs or outputs the drain electrode that an end wherein connects a described NMOS pipe, and the other end connects the drain electrode of described the 2nd NMOS pipe; The grid of a described NMOS pipe receives the output signal of described envelope detection module, source ground; Described RC unit receives the output signal of described envelope detection module; The grid of described the 2nd NMOS pipe receives the output signal of described RC unit, source ground; Draw the lead-out terminal of restituted signal from the output of described the second current mirror.
Described RC unit comprises resistance and electric capacity, and a termination of wherein said resistance is received the output signal of described envelope ripple detection module, and the other end is connected with an end of electric capacity; The other end ground connection of described electric capacity; The lead-out terminal of drawing the RC unit from the tie point of electric capacity and resistance is connected to the grid of described the 2nd NMOS pipe.
The present invention also provides a kind of electronic tag, and it comprises antenna, power module, rectification module, modulation /demodulation module, control module, memory module and aforesaid electronic tag demodulation circuit.
The present invention also provides a kind of method that electronic labeling information is carried out demodulation of the demodulator circuit based on above-mentioned electronic tag, may further comprise the steps:
Envelope ripple signal in the received RF signal;
The envelope ripple signal of described reception is changed into d. c. voltage signal;
Adopt current ratio mode that described d. c. voltage signal is carried out demodulation;
The output restituted signal.
Further, adopt current ratio mode that the step that described d. c. voltage signal carries out demodulation is comprised the current reference that produces comparison by current mirroring circuit by the dynamically adapting mode.
The beneficial effect of the technical program is: adopt the envelope detection module that envelope signal is converted to d. c. voltage signal, then adopt current ratio mode that signal is carried out demodulation, structure that can the simplified solution demodulation circuit reduces power consumption; Adopt the mode of dynamically adapting to produce the current reference of comparison, can change the dynamic adjustments reference with input voltage, avoid too relying on reference current, more the Effective Raise demodulation sensitivity.
Description of drawings
Fig. 1 is electronic tag demodulation circuit structural representation among the technical program embodiment one;
Fig. 2 is output Shaping modular structure schematic diagram among the technical program embodiment one;
Fig. 3 is envelope detection modular circuit structure chart among the technical program embodiment one;
Fig. 4 is demodulation module circuit structure diagram among the technical program embodiment one;
Fig. 5 is RC element circuit structure chart among Fig. 4;
Fig. 6 is demodulation module circuit structure diagram among the technical program embodiment two.
Fig. 7 is output Shaping modular structure schematic diagram among the technical program embodiment two;
Fig. 8 is the structural representation of electronic tag among the technical program embodiment three;
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Main inventive concept of the present invention is: by envelope signal is converted to d. c. voltage signal, adopt current ratio method that signal is carried out demodulation again, simplify circuit structure, reduce power consumption; Adopt dynamically adapting mode generation current benchmark, avoid relying on reference current, improve demodulation sensitivity.
Embodiment one:
Please refer to Fig. 1, Fig. 1 is electronic tag demodulation circuit structural representation in the present embodiment; Electronic tag demodulation circuit comprises envelope detection module 1 and demodulation module 2.Envelope ripple signal in described envelope ripple detection module 1 received RF signal and an envelope ripple signal that receives convert d. c. voltage signal to and output in the described demodulation module 2; Described demodulation module 2 carries out demodulation and exports restituted signal described d. c. voltage signal by current ratio mode.Further, described electronic tag demodulation circuit also comprises output Shaping module 3; The output signal of described output Shaping module 3 receiving demodulation modules can be carried out Shape correction to the signal after the demodulation; Demodulation module 2 demodulated output signals generally are not ideal signals, and signal power is more weak, in order better to output to rear level system, generally demodulated output signal is carried out Shape correction, please refer to Fig. 2, Fig. 2 is output Shaping modular structure schematic diagram in the present embodiment, and described output Shaping module 3 can adopt inverter that signal is processed simply, adopts 31 pairs of demodulated output signals of Si Mite inverter to carry out Shape correction in the present embodiment; Certainly, be not that all electronic tag demodulation circuits all need the output Shaping module, some system requirements are not very high, and perhaps the rear class treatment system is enough to the signal that described demodulation module 2 demodulates is carried out identifying processing, with regard to not needing to increase the output Shaping module restituted signal are carried out shaping.
Concrete, please refer to Fig. 3, Fig. 3 is envelope detection modular circuit structure chart in the present embodiment; Described envelope ripple detection module 1 can comprise n the first capacitor C q1 to Cqn, 2n the first diode D1 to D2n, n the second capacitor C p1 to Cpn and m the second diode Da1 to Dam; Wherein, described the first diode D1 to D2n successively forward is serially connected in the first branch road, the positive terminal of described the first branch road is the positive terminal ground connection of first diode D1, and the negative pole end of described the first branch road i.e. negative pole end of 2n the first diode D2n is drawn the lead-out terminal VA of module; Along described the first branch road positive terminal to the 1st, 3,5 of negative pole end direction ... 2n-1 described the first diode (is D1, D3, D5 ... D2n-1, i.e. the first diode of all odd indexed) negative pole connect respectively the end of described the first capacitor C q1 to Cqn; The other end of described the first capacitor C q1 to Cqn connects envelope ripple signal Vrf in the antenna reception radiofrequency signal, along described the first branch road positive terminal to the 2nd, 4,6 of negative pole end direction ... 2n described the first diode (is D2, D4, D6 ... D2n, i.e. the first diode of all even number sequence numbers) negative pole connect respectively the end of described the second capacitor C p1 to Cpn; The other end ground connection of described the second capacitor C p1 to Cpn; Described the second diode Da1 to Dam forward is serially connected in the second branch road, the positive terminal of described the second branch road is the negative pole end (being the negative pole end of D2n) that the positive terminal of Dam connects described the first branch road, the negative pole end of described the second branch road (being the negative pole end of Da1) ground connection.The envelope detection module 1 that connects by foregoing circuit, d. c. voltage signal that envelope ripple signal is converted to that can precise and high efficiency is exported from the VA end.
Please refer to Fig. 4 and Fig. 5, wherein, Fig. 4 is demodulation module circuit structure diagram in the present embodiment, and Fig. 5 is RC element circuit structure chart among Fig. 4; Described demodulation module 2 can comprise current reference generation unit 21, and described current reference generation unit 21 comprises the first current mirroring circuit and the second current mirroring circuit by dynamically adapting mode generation current benchmark.Described the first current mirroring circuit comprises PMOS pipe PM1 and the 2nd PMOS pipe PM2, described PMOS pipe PM1 source electrode is connected with the source electrode of described the 2nd PMOS pipe PM2, and the end of connection Signal-controlled switch K1, the other end of described Signal-controlled switch K1 connects supply power voltage; The drain electrode of described PMOS pipe PM1 is the input of described the first current mirroring circuit, and its connection meets reference current Iref, and reference power source Iref is provided by current source; The grid of described PMOS pipe PM1 connects drain electrode and connects the grid of described the 2nd PMOS pipe PM2; The drain electrode of described the 2nd PMOS pipe PM2 is the output of described the first current mirroring circuit; The drain electrode end of described the 2nd PMOS pipe PM2 can go out the equal-sized output current of input current of managing the drain electrode end of PM1 with a described PMOS by mirror image.Described the second current mirroring circuit comprises the 3rd PMOS pipe PM3 and the 4th PMOS pipe PM4, the source electrode of described the 3rd PMOS pipe PM3 is connected with the source electrode of described the 4th PMOS pipe PM4 and is connected with the output (being the drain electrode end of described the 2nd PMOS pipe PM2) of described the first current mirroring circuit, the drain electrode of described the 3rd PMOS pipe PM3 is the input of described the second current mirror, connects the output signal of described envelope ripple detection module 1; The grid of described the 3rd PMOS pipe PM3 is connected with the grid of described the 4th PMOS pipe PM4 and is connected with the drain electrode of described the 4th PMOS pipe PM4; The drain electrode of described the 4th PMOS pipe PM4 is the output of described the second current mirroring circuit.
Further, described demodulation module 2 also comprises comparison demodulating unit 22, described relatively demodulating unit 22 is used for receiving the d. c. voltage signal of described envelope ripple detection module 1 output, and by current ratio mode described d. c. voltage signal demodulation is out also exported; Described relatively demodulating unit 22 comprises NMOS pipe NM1, the 2nd NMOS pipe NM2 and RC unit 221; Wherein, the output of described the second current mirroring circuit connects the drain electrode of described NMOS pipe NM1, and input connects the drain electrode of described the 2nd NMOS pipe NM2; The grid of described NMOS pipe NM1 receives the output signal VA of described envelope detection module, source ground; Described RC unit 221 receives the output signal VA of described envelope detection module; The grid of described the 2nd NMOS pipe NM2 receives the output signal VB of described RC unit 221, source ground; Draw the lead-out terminal VC of restituted signal from the output (being the drain electrode of described PMOS pipe PM3) of described the second current mirror.
Described RC unit 221 can also comprise resistance and electric capacity, and a termination of wherein said resistance is received the output signal of described envelope ripple detection module, and the other end is connected with an end of electric capacity; The other end ground connection of described electric capacity; The lead-out terminal VB that draws the RC unit from the tie point of electric capacity and resistance is connected to the grid of described the 2nd NMOS pipe.
In actual demodulation is used, by signal controlling closure signal control switch K1, demodulation module 2 is started working, produce reference current Iref from the input of described the first current mirroring circuit, the image current I0 that the output maximum of described the first current mirroring circuit can obtain to equate with reference current Iref exports, under normal circumstances, the magnitude of voltage of the signal VA that reads from envelope ripple detection module 1 equates with magnitude of voltage through the output signal VB of RC unit, the output end current I2 of described the second current mirror equates with input electric current I 1, i.e. I1=I2=(1/2) * I0; Because the output signal VA of envelope ripple detection module 1 can change, under the effect of RC unit, the grid voltage VB variation of described the 2nd NMOS pipe NM2 can lag behind the variation of the grid voltage VA of described NMOS pipe NM1 a little, the situation that VB is not equal to VA occurs:
When from high to low level saltus step appears in the change in voltage of VA, voltage on the VB is because the RC impact, descend slowlyer than VA terminal voltage, VB＞VA appears, therefore, the electric current I 2 that flows through described the 2nd NMOS pipe NM2 can keep larger, and the VA terminal voltage is lower, the electric current I 1 that flows through NMOS pipe NM1 can be smaller, cause I1＜I2, so demodulation module 2 output voltage V C＞(1/2) * VDD, described demodulation module 2 output voltages are input in the output Shaping module 3, since the effect of Si Mite inverter 31, output Shaping module 3 output output signals " 0 "; Same, when level saltus step from low to high appearred in the change in voltage of VA, the voltage on the VB was because the RC impact is risen to such an extent that VB＜VA slowly occurs than VA terminal voltage, therefore, the electric current I 2 that flows through described the 2nd NMOS pipe NM2 can keep smaller, and the VA terminal voltage is higher, and the electric current I 1 that flows through NMOS pipe NM1 can be larger, cause I1＞I2, so demodulation module 2 output voltage V C＜(1/2) * VDD, by the shaping of output Shaping module 3, output output signal " 1 "; Realization is to the demodulation of electronic tag.
By as can be known aforementioned, system produces is used for the curent change that reference current I2 relatively can control along with the change in voltage of the output VB of described RC unit described the 2nd NMOS pipe NM2, realized dynamically adapting, by the mode of image current I0, the output maximum power dissipation of timing is separated in control simultaneously.In addition, after demodulation is finished, by signal controlling cut-off signal control switch K1, disconnect the demodulation module power supply, can reduce static power consumption.
Adopt above-mentioned electronic tag demodulation circuit electronic labeling information to be carried out the method for demodulation, can comprise the steps:
The envelope ripple signal of radiofrequency signal in envelope detection module 1 reception antenna, and the envelope ripple signal that receives is transformed into d. c. voltage signal;
Demodulation module 2 receives the output signal of envelope ripple detection module 1, adopts current ratio mode that described d. c. voltage signal is carried out demodulation;
Signal after the output demodulation.
Further, receive the output signal of envelope ripple detection module 1 at demodulation module 2, adopt current ratio mode described d. c. voltage signal to be carried out in the step of demodulation, can also produce dynamically adapting current reference relatively by current mirroring circuit.
Embodiment two:
Please refer to Fig. 6, Fig. 6 is the present embodiment demodulation module circuit structure diagram; Compare with embodiment one described electronic tag demodulation circuit, in the present embodiment, the grid of described the 3rd PMOS pipe PM3 of demodulation module 2 and the drain electrode of described the 3rd PMOS pipe PM3 are connected to form the input of described the second current mirroring circuit; Draw lead-out terminal VD from the output (being the drain electrode of described the 4th PMOS pipe PM4) of described the second current mirror.
Further, please refer to Fig. 7, Fig. 7 is the present embodiment output Shaping modular structure schematic diagram; Described output Shaping module 3 comprises Si Mite inverter 31 and the plain inverter 32 that is connected in series with described Si Mite inverter 31, like this can be so that the output signal of output Shaping module 3 is consistent with the output signal of demodulation module 2.
In implementing the demodulation application, when from high to low level saltus step appears in the change in voltage of VA, voltage on the VB is because the RC impact, descend to such an extent that VB＞VA slowly occurs than VA terminal voltage, therefore, the maximum current I2 that flows through described the 2nd NMOS pipe NM2 can keep larger, and the VA terminal voltage is lower, the electric current I 1 that flows through described NMOS pipe NM1 can be smaller, cause I1＜I2, the image ratio by described the 3rd PMOS pipe PM3 and described the 4th PMOS pipe PM4 after, demodulation module 2 output voltage V D＜(1/2) * VDD, 3 couples of demodulated output signal VD carry out shaping by the output Shaping module, the output output signal " 0 " of described output Shaping module 3; Same, when level saltus step from low to high appears in the change in voltage of VA, voltage on the VB is because the RC impact, rise to such an extent that VB＜VA slowly occurs than VA terminal voltage, therefore, the electric current I 2 that flows through described the 2nd NMOS pipe NM2 can keep smaller, and the VA terminal voltage is higher, the electric current I 1 that flows through NMOS pipe NM1 can be larger, cause I1＞I2, the image ratio by described the 3rd PMOS pipe PM3 and described the 4th PMOS pipe PM4 after, described demodulation module 2 output voltage V D＞(1/2) * VDD, 3 couples of demodulated output signal VD carry out shaping by the output Shaping module, the output output signal " 1 " of described output Shaping module 3; Thereby realize the demodulation to electronic tag.
Same, the output Shaping module 3 in the present embodiment can require only to design to comprise Si Mite inverter 31 according to actual design, even omit the design of output Shaping module 3 according to the specific requirement of system.
Embodiment three:
Please refer to Fig. 8, Fig. 8 is Electronic Tag Structure schematic diagram in the present embodiment; Described electronic tag comprises antenna, rectification module 4, power module 5, modulation /demodulation module 6, control module 7 and memory module 8, described rectification module 4 reception antenna signals convert the battery ripple signal that receives in signal of telecommunication input modulation /demodulation module 6 and the power module 5 to; Described power module 5 can provide stable supply power voltage; Described modulation /demodulation module 6 includes said electronic tag demodulation circuit among above-described embodiment one or the embodiment two, can demodulate the signal that receives in the electronic labeling information input control module; Described control module 7 can be controlled communication system, and the electronic tag after the received demodulation is delivered in the memory module 8 and preserved, and the electronic labeling information that reads in the memory module 8 is processed.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (12)
1. an electronic tag demodulation circuit comprises envelope detection module and demodulation module, and the envelope ripple signal in the described envelope detection module received RF signal, described demodulation module receive the output signal of described envelope detection module and carry out demodulation; It is characterized in that, described envelope ripple detection module converts the envelope ripple signal that receives to d. c. voltage signal and outputs in the described demodulation module; Described demodulation module carries out demodulation and exports restituted signal described d. c. voltage signal by current ratio mode.
2. electronic tag demodulation circuit according to claim 1, it is characterized in that, described envelope ripple detection module comprises: individual the first electric capacity of n, 2n the first diode, n the second electric capacity, m the second diode, n, m are the positive integer greater than 1, described the first diode successively forward is serially connected in the first branch road, the positive terminal ground connection of described the first branch road, the negative pole end of described the first branch road are the output of envelope ripple detection module; Along described the first branch road positive terminal to the negative pole end direction the 1st, 3, the negative pole of 5...2n-1 described the first diode connects respectively an end of described the first electric capacity; The other end of described the first electric capacity connects antenna reception envelope ripple signal; Along described the first branch road positive terminal to the negative pole end direction the 2nd, 4, the negative pole of 6...2n described the first diode connects respectively an end of described the second electric capacity; The other end of described the second electric capacity is ground connection respectively; Described the second diode forward is serially connected in the second branch road, and the positive terminal of described the second branch road connects the negative pole end of described the first branch road, the negative pole end ground connection of described the second branch road.
3. electronic tag demodulation circuit according to claim 1 is characterized in that, described electronic tag demodulation circuit also comprises the output Shaping module, and described output Shaping module connects the output of demodulation module, is used for the output signal of demodulation module is carried out shaping.
4. electronic tag demodulation circuit according to claim 3 is characterized in that, described output Shaping module is the Si Mite inverter.
5. electronic tag demodulation circuit according to claim 4 is characterized in that, described output Shaping module also comprises the inverter that is connected to described Si Mite inverter output.
6. each described electronic tag demodulation circuit according to claim 1-5, it is characterized in that, described demodulation module comprises current reference generation unit and comparison demodulating unit, and wherein, described current reference generation unit is used for by dynamically adapting mode generation current benchmark; Described relatively demodulating unit is used for demodulating by current ratio mode signal and the output of electronic tag.
7. described electronic tag demodulation circuit according to claim 6 is characterized in that, described current reference generation unit comprises the first current mirroring circuit and the second current mirroring circuit; The source electrode of PMOS pipe connects supply power voltage by Signal-controlled switch in described the first current mirroring circuit, the input termination reference current of described the first current mirroring circuit, and the mirror image output connects the source electrode of PMOS pipe in described the second current mirroring circuit.
8. electronic tag circuit according to claim 6 is characterized in that, described relatively demodulating unit comprises NMOS pipe, the 2nd NMOS pipe and RC unit; Wherein, the wherein end that described the second current mirroring circuit inputs or outputs connects the drain electrode of a described NMOS pipe, and the other end connects the drain electrode of described the 2nd NMOS pipe; The grid of a described NMOS pipe receives the output signal of described envelope detection module, source ground; Described RC unit receives the output signal of described envelope detection module; The grid of described the 2nd NMOS pipe receives the output signal of described RC unit, source ground; Draw the lead-out terminal of restituted signal from the output of described the second current mirror.
9. electronic tag demodulation circuit according to claim 7 is characterized in that, described RC unit comprises resistance and electric capacity, and a termination of wherein said resistance is received the output signal of described envelope ripple detection module, and the other end is connected with an end of electric capacity; The other end ground connection of described electric capacity; The lead-out terminal of drawing the RC unit from the tie point of electric capacity and resistance is connected to the grid of described the 2nd NMOS pipe.
10. an electronic tag comprises antenna, power module, rectification module, modulation /demodulation module, control module and memory module, it is characterized in that, described modulation /demodulation module comprises each described electronic tag demodulation circuit of claim 1 to 9.
11. the demodulation method of an electronic tag carries out demodulation based on each described electronic tag demodulation circuit of claim 1-9 to electronic labeling information, may further comprise the steps:
Envelope ripple signal in the received RF signal;
The envelope ripple signal of described reception is changed into d. c. voltage signal;
Adopt current ratio mode that described d. c. voltage signal is carried out demodulation;
The output restituted signal.
12. demodulation method according to claim 11 is characterized in that, adopts current ratio mode that the step that described d. c. voltage signal carries out demodulation is comprised that the employing current mirroring circuit produces the current reference of comparison by the dynamically adapting mode.
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