The content of the invention
The present invention solves the technical problem of a kind of mobile device is provided, can solve the problem that and easily felt using PLM patternsShould fail or sense time-consuming problem.
In order to solve the above technical problems, one aspect of the present invention is：A kind of mobile device, the shifting are providedDynamic device interior is integrated with load modulation circuit, and the load modulation circuit includes：Inductive antenna circuit, for sensing outside friendshipBecome electromagnetic signal to produce aerial signal；Modulation circuit, couples the inductive antenna circuit, for modulated signal and carrier wave to be believedNumber it is modulated, and the signal of modulation is transferred through to the inductive antenna circuit, causes that the inductive antenna circuit sendsThe signal through ovennodulation；Carrier circuit, the carrier circuit is coupled to the inductive antenna circuit with the modulation circuitBetween, for producing carrier signal；Wherein, when the modulated signal has the first logical value, the carrier circuit produce withThe synchronous first carrier signal of the aerial signal；When the modulated signal has the second logical value, the carrier circuit is producedThere is the second poor carrier signal of predetermined phase with the aerial signal in life.
Wherein, the load modulation circuit is further included：Signal generating circuit, couples the modulation circuit, for rootThe modulated signal is produced according to the identification information of the mobile device.
Wherein, the load modulation circuit is further included：Controller, is coupled to the signal generating circuit and the loadBetween wave circuit, for when the carrier circuit receives the aerial signal, controlling the signal generating circuit to produce instituteModulated signal is stated, and monitors the logical value of the modulated signal, and when the modulated signal has the first logical value, control instituteState carrier circuit and produce the first carrier signal synchronous with the aerial signal；There is the second logical value in the modulated signalWhen, control the carrier circuit to produce and there is the second poor carrier signal of predetermined phase with the aerial signal.
Wherein, the load modulation circuit is further included：Memory, couples the signal generating circuit, for storingThe identification information of the mobile device.
Wherein, the carrier circuit includes:Clock extracting circuit, couples the inductive antenna circuit, described for obtainingAerial signal simultaneously generates clock signal；Phaselocked loop, is coupled between the clock extracting circuit and the modulation circuit, for rootSinusoidal carrier signal and cosine carrier signal are generated according to the clock signal；The controller is coupled to the signal generating circuitAnd the phaselocked loop between, the logical value specifically for monitoring the modulated signal that the signal generating circuit is produced, andWhen the modulated signal has the first logical value, first synchronous with the aerial signal is sinusoidal to be carried to control the phaselocked loop to produceRipple signal and the first cosine carrier signal；When the modulated signal has the second logical value, control the phaselocked loop produce withThere is second sinusoidal carrier signal and the second cosine carrier signal of predetermined phase difference in the aerial signal.
Wherein, the predetermined phase difference is 180 degree.
Wherein, the load modulation circuit is further included：Demodulator circuit, is coupled to the clock extracting circuit and describedBetween inductive antenna circuit, for by aerial signal demodulation, to cause the clock extracting circuit according to the institute after demodulationState aerial signal and produce the clock signal.
Wherein, the modulation circuit includes：First digital analog converter, for the modulated signal to be converted into Sine ModulatedSignal；Second digital analog converter, for the modulated signal to be converted into cosine-modulation signal；First multiplier, for by instituteSinusoidal modulation signal is stated to be multiplied with the sinusoidal carrier signal；Second multiplier, for by the cosine-modulation signal with it is describedCosine carrier signal multiplication；Adder, for by first multiplier be added with the output signal of second multiplier withGenerate the signal through ovennodulation.
Wherein, the load modulation circuit is further included：Amplifier, is coupled to the modulation circuit with the sensing dayBetween line circuit, for the signal through ovennodulation to be amplified after transmit to the inductive antenna circuit.
Wherein, the inductive antenna circuit includes：Induction coil；First electric capacity, is parallel to the induction coil；Second electricityHold, one end is respectively coupled to the induction coil, first electric capacity and the carrier circuit, and the other end is coupled to the modulationCircuit.
The beneficial effects of the invention are as follows：It is different from the situation of prior art, the load that mobile device inside of the present invention usesModulation circuit produces the first carrier signal synchronous with aerial signal when modulated signal has the first logical value, believes in modulationNumber have the second logical value when, produce with aerial signal exist predetermined phase difference the second carrier signal so that through ovennodulationSignal amplitude changes greatly, so as in the case where antenna area is not increased, the signal intensity of enhancing inductive antenna circuit output is enteredAnd distance of reaction and sensitivity are improved, reduce the probability of induced failure.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completeSite preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based onEmbodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not madeEmbodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, Fig. 1 is the structural representation of the implementation method of mobile device of the present invention.As shown in figure 1, of the inventionMobile device 10 has been internally integrated load modulation circuit 101.
Wherein, mobile device 10 can be the equipment with NFC function such as mobile phone, panel computer, not do specific limit hereinIt is fixed.Load modulation circuit 101 includes：Inductive antenna circuit 1011, modulation circuit 1012 and carrier circuit 1013.
Inductive antenna circuit 1011, for sensing outside alternating electromagnetism signal to produce aerial signal；
Specifically, as shown in Fig. 2 inductive antenna circuit 1011 includes：Induction coil L1, the first electric capacity C1 and the second electric capacityC2；Wherein, the first electric capacity C1 is parallel to induction coil L1, and second electric capacity C2 one end is respectively coupled to induction coil L1, the first electricityHold C1 and carrier circuit 1013, the other end is coupled to modulation circuit 1012.
In an application examples, induction coil L1 is NFC antenna, is operated in 13.56MHz frequencies, and communication distance is less than 20Centimetre.When mobile device 10 and external card reader (not shown) distance are less than 20 centimetres, based on inductively principle, the line of inductionCircle L1 can sense the alternating electromagnetism signal of external card reader transmission, produce alternation aerial signal.First electric capacity C1 and induction coilL1 composes in parallel LC resonance circuits, by setting the impedance of the first electric capacity C1 and induction coil L1, can cause that resonant frequency is13.56MHz, i.e. NFC antenna working frequency.Second electric capacity C2 is coupled between modulation circuit 1012 and LC resonance circuits, can be withThe signal of the output of modulation circuit 1012 is filtered due to the DC component of the generations such as interference, it is reduced to inductive antenna circuit 1011Influence.
Modulation circuit 1012, couples inductive antenna circuit 1011, for modulated signal to be modulated with carrier signal, andThe signal of modulation is transferred through to inductive antenna circuit 1011, to cause that inductive antenna circuit 1011 is sent through the letter of ovennodulationNumber；
Carrier circuit 1013, is coupled between inductive antenna circuit 1011 and modulation circuit 1012, for producing carrier wave to believeNumber；
Wherein, when modulated signal has the first logical value, carrier circuit 1013 produces first synchronous with aerial signalCarrier signal；When modulated signal has the second logical value, to there is predetermined phase in the generation of carrier circuit 1013 poor with aerial signalThe second carrier signal.
Specifically, in above-mentioned application examples, the coupling inductive antenna circuit 1011 of modulation circuit 1012, the coupling of carrier circuit 1013It is connected between inductive antenna circuit 1011 and modulation circuit 1012, outside alternating electromagnetism letter is sensed in inductive antenna circuit 1011Number, after producing aerial signal, carrier circuit 1013 receives the aerial signal, produces carrier signal, and modulation circuit 1012 will be adjustedSignal processed is modulated with carrier signal, and the signal of modulation, inductive antenna circuit are transferred through to inductive antenna circuit 10111011 send receive this through ovennodulation signal, with cause external card reader obtain the signal through ovennodulation.
Fig. 1 is further regarded to, load modulation circuit 101 is further included：Signal generating circuit 1014, the and of memory 1015Controller 1016.
Wherein, the coupling of signal generating circuit 1014 modulation circuit 1011, for being produced according to the identification information of mobile device 10Raw modulated signal；
Memory 1015 couples signal generating circuit 1014, the identification information for storing mobile device 10；
Controller 1016 is coupled between signal generating circuit 1014 and carrier circuit 1013, in carrier circuit 1013When receiving aerial signal, the generation modulated signal of control signal generative circuit 1014, and the logical value of modulated signal is monitored, andWhen modulated signal has the first logical value, control carrier circuit 1013 produces the first carrier signal synchronous with aerial signal；When modulated signal has the second logical value, control carrier circuit 1013 produces the second load that there is predetermined phase difference with aerial signalRipple signal.Wherein, predetermined phase difference is 180 degree.
Specifically, in above-mentioned application examples, the identification information at least identity including mobile device 10 of mobile device 10 is believedThe information such as breath, such as device id or password；The tune that signal generating circuit 1014 is produced according to the identification information of mobile device 10Signal processed is data signal, including two logical values, is respectively the first logical value 1 and the second logical value 0；Controller 1016 can be withIt is IC chip, when carrier circuit 1013 receives aerial signal, controller 1016 sends first to signal generating circuit 1014Control signal, after signal generating circuit 1014 receives the first control signal, according to the identification information stored in memory 1015Modulated signal is produced, controller 1016 monitors the logic value changes of modulated signal, when modulated signal has the first logical value 1,Controller 1016 sends the second control signal to carrier circuit 1013, after carrier circuit 1013 receives the second control signal, producesThe life first carrier signal synchronous with aerial signal, i.e. frequency and phase with aerial signal identical first carrier signal,When modulated signal has the second logical value 0, controller 1016 sends the 3rd control signal, carrier circuit to carrier circuit 1013After 1013 receive the 3rd control signal, the second carrier signal that there is 180 degree phase difference with aerial signal is produced；Wherein, adjustSignal processed is low frequency signal, and first carrier signal and the second carrier signal are high-frequency signals, are modulated through overmodulated circuit 1012Afterwards, it is also high-frequency signal through the signal of ovennodulation such that it is able to transmitted by inductive antenna circuit 1011, and due to the second loadThere is 180 degree phase difference in ripple signal so that with aerial signal when modulated signal has the second logical value, through the signal of ovennodulationIt is negative value, through the signal of ovennodulation during relative to modulated signal with the first logical value, changes in amplitude is big, so as to not increase dayIn the case of line area, the signal intensity of enhancing inductive antenna circuit output reduces the probability of induced failure.
Further, as shown in Fig. 2 carrier circuit 1013 includes:
Clock extracting circuit CKT, couples inductive antenna circuit 1011, for obtaining aerial signal and generating clock signal；
Phaselocked loop OS, is coupled between clock extracting circuit CKT and modulation circuit 1011, for being generated according to clock signalSinusoidal carrier signal and cosine carrier signal；
Controller 1016 is coupled between signal generating circuit 1014 and phaselocked loop OS, and electricity is generated specifically for monitoring signalsThe logical value of the modulated signal that road 1014 produces, and when modulated signal has the first logical value, control phaselocked loop OS produce withAerial signal synchronous the first sinusoidal carrier signal and the first cosine carrier signal；When modulated signal has the second logical value,Control phaselocked loop OS produces the second sinusoidal carrier signal and the second cosine carrier signal that there is predetermined phase difference with aerial signal.
Modulation circuit 1012 includes：
First digital analog converter DAC1, for modulated signal to be converted into sinusoidal modulation signal；
Second digital analog converter DAC2, for modulated signal to be converted into cosine-modulation signal；
First multiplier MUP1, for sinusoidal modulation signal to be multiplied with sinusoidal carrier signal；
Second multiplier MUP2, for by cosine-modulation signal and cosine carrier signal multiplication；
Adder ADD, for the output signal of the first multiplier MUP1 and the second multiplier MUP2 to be added to generate warpThe signal of ovennodulation.
Specifically, with reference to shown in Fig. 2 and Fig. 3, inductive antenna circuit 1011 senses outside alternating electromagnetism signal and produces antennaAfter signal, the clock extracting circuit CKT being coupled with it obtains the aerial signal, and the clock signal CK of generation is transferred into lock phaseRing OS；When modulated signal has the first logic 1, controller 1016 sends the second control signal, phaselocked loop OS to phaselocked loop OSThe second control signal is received, the first sinusoidal carrier signal sinA and first synchronous with aerial signal is produced according to clock signal CKCosine carrier signal cosA, wherein, the first sinusoidal carrier signal sinA passes through the first multiplier MUP1 and the first digital analog converterThe sinusoidal modulation signal sinB of DAC1 outputs is multiplied, and the first cosine carrier signal cosA is by the numbers of the second multiplier MUP2 and secondThe cosine-modulation signal cosB of weighted-voltage D/A converter DAC2 outputs is multiplied, and then, adder ADD multiplies the first multiplier MUP1 and secondThe output signal of musical instruments used in a Buddhist or Taoist mass MUP2 is generated through the signal cos (A-B) of ovennodulation after being added；When modulated signal has the second logical zero,Controller 1016 sends the 3rd control signal to phaselocked loop OS, and phaselocked loop OS receives the 3rd control signal, according to clock signal CKProduce the second sinusoidal carrier signal sin (A-180 °) and the second cosine carrier signal that there is 180 degree phase difference with aerial signalCos (A-180 °), wherein, the second (A-180 °) of sinusoidal carrier signal sin passes through the first multiplier MUP1 and the first digital-to-analogue conversionThe sinusoidal modulation signal sinB of device DAC1 outputs is multiplied, and the second (A-180 °) of cosine carrier signal cos passes through the second multiplierThe cosine-modulation signal cosB that MUP2 is exported with the second digital analog converter DAC2 is multiplied, and then, adder ADD is by the first multiplierThe output signal of MUP1 and the second multiplier MUP2 is generated through the signal-cos (A-B) of ovennodulation after being added；Wherein, it is specific to calculateProcess refers to equation below (1) and formula (2)：
SinAsinB+cosAcosB=cos (A-B) (1)
Sin (A-180 °) sinB+cos (A-180 °) cosB=-sinAsinB-cosAcosB=-cos (A-B) (2)
Thus, by above-mentioned modulated process, the high frequency sinusoidal carrier signal and high-frequency cosine carrier wave letter of phaselocked loop OS outputsNumber the modulated signal of low frequency is modulated to high-frequency signal, and signal through ovennodulation only accounts for a frequency range, so as to save frequency domainResource.
Fig. 3 is further regarded to, is received by modulated signal MS and card reader and the signal DS contrasts after demodulating is as can be seen that warpAbove-mentioned modulated process is crossed, the signal amplitude difference through ovennodulation that mobile device 10 sends is big, i.e., signal intensity is big, so as to reduceThe probability of induced failure.
Fig. 1 and Fig. 2 is further regarded to, load modulation circuit 101 is further included：Demodulator circuit 1017 and amplifier1018。
Demodulator circuit 1017 is coupled between clock extracting circuit CKT and inductive antenna circuit 1011, for antenna to be believedNumber demodulation, with cause clock extracting circuit CKT according to after demodulation aerial signal produce clock signal.
Amplifier 1018 is coupled between modulation circuit 1012 and inductive antenna circuit 1011, for by through the letter of ovennodulationTransmitted to inductive antenna circuit 1011 after number being amplified.
Specifically, the outside alternating electromagnetism signal of the sensing of inductive antenna circuit 1011 can be external card reader through ovennodulationThe signal for sending afterwards, therefore sense after the aerial signal produced after the signal needs demodulated circuit 1017 to be demodulated, whenClock extracts circuit CKT and could produce clock signal according to the aerial signal after demodulation；Amplifier 1018 is power amplifier, can be withTransmitted to inductive antenna circuit 1011 after being amplified through the signal of ovennodulation, can be easier to feel in order to external card readerThe signal of the transmission of inductive antenna circuit 1011 should be arrived, it is to avoid occur sensing less than letter due to the too low card reader of the signal amplitude for sendingNumber problem.Wherein, the gain amplifier of amplifier 1018 can be set in advance, or can be with by controller 1016Adjustment, it is not specifically limited herein.
In the above-described embodiment, the load modulation circuit that mobile device inside uses has the first logic in modulated signalDuring value, the first carrier signal synchronous with aerial signal is produced, when modulated signal has the second logical value, produced and antenna letterNumber there is the second carrier signal of predetermined phase difference so that through ovennodulation signal amplitude change greatly, so as to not increase antennaIn the case of area, the signal intensity of enhancing inductive antenna circuit output, and then distance of reaction and sensitivity are improved, reduce sensingThe probability of failure.
Embodiments of the present invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every using thisEquivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlationsTechnical field, is included within the scope of the present invention.