CN203590255U - Modulation device with active tag capable of sending subcarrier directly - Google Patents
Modulation device with active tag capable of sending subcarrier directly Download PDFInfo
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- CN203590255U CN203590255U CN201320738641.8U CN201320738641U CN203590255U CN 203590255 U CN203590255 U CN 203590255U CN 201320738641 U CN201320738641 U CN 201320738641U CN 203590255 U CN203590255 U CN 203590255U
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- 239000000919 ceramic Substances 0.000 claims description 3
- 239000000969 carrier Substances 0.000 abstract 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 6
- 230000035515 penetration Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The utility model discloses a modulation device with an active tag capable of sending a subcarrier directly, and relates to the technical field of mobile payment. The modulation device comprises a subcarrier generation module, a signal modulation module, a driving module and a matching network, wherein the output of the matching network is connected to an antenna; baseband signals are inputted into the signal modulation module; subcarrier generation module generates 848KHz subcarrier signals; the signal modulation module carries out amplitude modulation on the subcarrier and the baseband signal to obtain amplitude-modulated waves; the driving module carries out adjustment on output power of the amplitude-modulated waves; and the matching network matching impedance of the antenna with output impedance of the driving module at the same time, and enables the maximum efficiency of output power to be transmitted to both ends of the antenna. The modulation device sends the 848KHz modulation subcarrier directly, thereby avoiding a problem that local carriers and external carriers are synchronous, enhancing the penetrating power of signals, and being better in adaptability.
Description
Technical field
The utility model relates to mobile payment technical field, and the active label that is particularly applied to mobile payment field directly sends the modulating device of subcarrier.
Background technology
In recent years, mobile payment industry development is also really come into people's life.So-called mobile payment refers to a kind of mode that user carries out account payment by individual mobile terminal (normally mobile phone) to the commodity of consuming or service.At home, it is 13.56MHz that mobile payment regulation is used frequency range, based on this frequency range, existing mobile payment scheme mainly contains three kinds, a kind of is NFC(near field communication) technology, this scheme needs embedded in mobile phone to have special-purpose NFC chip, so the popularization of this scheme is comparatively slow.First scheme is SIM Pass technology, and this scheme does not need existing mobile phone to change, but by the needed chip package of radio communication in SIM cards of mobile phones or SD card, thereby improved ease for use and the popularized type of scheme.But this scheme still needs one at SIM card or the external larger antenna of SD card, and antenna is subject to the particular accessories of mobile phone as battery, and the impact of metal shell etc. is larger, so cause the handset compatibility of this scheme poor.The third scheme is full card technique, this scheme has been continued to use the thought of SIM Pass technology, and improves, and radio communication chip and antenna are fully integratible on SIM card or SD card, no longer add external antenna, whole SIM card or SD card are equivalent to an active label.The high integration of full card scheme has all proposed higher specification requirement to links such as chip design, encapsulation.Whole scheme is in ease for use, and the comprehensive advantage that the aspects such as generalization and handset compatibility show, therefore also becomes a kind of scheme that is concerned most and has an optimistic view of.
In full card scheme, most crucial technological difficulties are exactly by antenna miniaturization, to can seal in SIM card or SD card.What miniature antenna the most directly affected is exactly communication capacity (communication distance).Particularly, when receiving signal, small size antenna can cause the external signal receiving to die down, and this can solve by improving the sensitivity of receiver.But when transmitting, there is inborn fan-out capability restriction in the load-modulate mode that traditional passive label adopts.
In prior art, as shown in Figure 1, antenna ANT and load capacitance CL form resonance loop to load-modulate circuit, and RL is equivalent load impedance.Modulating subcarrier, by the break-make of control switch, can change the size of load impedance, thereby realizes the amplitude modulation(PAM) of the external subcarrier that antenna ends is sensed.This amplitude-modulated wave is reflected back transmitting terminal, carries out can obtaining transmitted signal after envelope demodulation.Referring to Fig. 2, it is the waveform schematic diagram in each stage of load-modulate mode.S1 is digital baseband signal, and S2 is subcarrier signal, with subcarrier S2, baseband signal S1 is carried out to amplitude modulation(PAM), obtains modulation signal S3.The break-make of this signal controlling open loop changes load resistance, thereby obtains amplitude-modulated wave S4.In the antenna end of card reader, the amplitude-modulated wave S4 receiving is carried out to envelope demodulation, finally can recover raw baseband signal S5.What load-modulate can be regarded utilization as is mutual inductance principle, and when antenna is less, when environment is poor, the large high attenuation of mutual inductance effect meeting, so can not be used in full card scheme.In order to solve the hypodynamic problem of emission energy, existing full card scheme adopts a kind of active carrier modulation mode.Be different from the load-modulate mode of passive label, entirely in card scheme, adopt active label technology, label is inner can produce local 13.56MHz carrier wave, after transmitting local carrier being modulated, outputs to antenna ends launch through driving stage.This active carrier modulation mode has strengthened emissivities by improving power output, but this scheme is still deposited problem both ways: one is need to local 13.56MHz carrier wave be synchronizeed and be processed with extraneous 13.56MHz carrier wave, otherwise the modulation signal of transmitting may correctly demodulation after card reader antenna receives.Another is to contain 13.56MHz high frequency carrier component in the modulation waveform sending, and high fdrequency component is poor to the penetrability of metal.Skin effect formula
, wherein d is penetration depth, f is wave frequency,
for magnetic permeability,
for conductivity.By formula, can be found out, frequency is higher, and penetration depth is less, is also that penetration capacity is poorer.Therefore for the mobile phone that contains metal shell, this scheme still has and may cannot be suitable for because signal penetration capacity is weak.
Summary of the invention
In order to overcome the deficiency existing in above-mentioned full card technique scheme, the purpose of this utility model provides a kind of active label directly to send the modulating device of subcarrier.It directly sends the modulating subcarrier of 848KHz, has avoided the stationary problem of local carrier and extraneous carrier wave, has strengthened the penetration capacity of signal, better adaptability simultaneously.
In order to reach foregoing invention object, the technical solution of the utility model realizes as follows:
A kind of active label directly sends the modulating device of subcarrier, its design feature is, it comprises subcarrier generation module, signal modulation module, driver module and the matching network connecting successively, and the output of matching network connects antenna, and baseband signal is input to signal modulation module.Subcarrier generation module produces 848KHz subcarrier signal, and signal modulation module carries out amplitude modulation(PAM) by subcarrier and digital baseband signal and obtains amplitude-modulated wave, and driver module is adjusted the power output of amplitude-modulated wave.Matching network mates the output impedance of the impedance of antenna and driver module simultaneously, makes the antenna ends that passes to of power output maximal efficiency.
In above-mentioned modulating device, described subcarrier generation module obtains the 848KHz subcarrier signal needing by phase-locked loop pll circuit and frequency divider.
In above-mentioned modulating device, described driver module is by changing the amplitude of signal or changing the driver output electric current of signal or the mode of both combinations realizes to the power output adjustment of amplitude-modulated wave.
In above-mentioned modulating device, described antenna adopts is convenient to be encapsulated in pcb antenna or the ceramic antenna in card.
The utility model is owing to having adopted said structure, compared with prior art, the beneficial effects of the utility model are not comprise 13.56MHz carrier component in transmitting modulation signal, thereby do not need to consider and the stationary problem of extraneous 13.56MHz carrier wave, make simplicity of design.In modulation signal, the highest frequency component is subcarrier 848KHz in addition, only has 1/16 of carrier wave 13.56MHz frequency, thereby stronger to the penetration capacity of metal, while using the active label of this scheme to be placed in the mobile phone with metal shell, the transmitted signal that penetrates out mobile phone is also stronger, is also that communication capacity is stronger.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is load-modulate mode circuit schematic diagram in prior art;
Fig. 2 is each stage signal oscillogram under load-modulate pattern in prior art;
Fig. 3 is structural representation of the present utility model;
Fig. 4 adopts each stage signal oscillogram under the utility model scheme in embodiment.
Embodiment
Referring to Fig. 3, the utility model comprises subcarrier generation module 1, signal modulation module 2, driver module 3 and the matching network 4 connecting successively, and the output of matching network 4 connects antenna 5, and baseband signal is input to signal modulation module 2.Subcarrier generation module 1 produces the 848KHz subcarrier signal needing by phase-locked loop pll circuit and frequency divider.Signal modulation module 2 carries out amplitude modulation(PAM) by subcarrier and digital baseband signal and obtains amplitude-modulated wave, and driver module 3 is by changing the amplitude of signal or changing the driver output electric current of signal or the mode of both combinations realizes the adjustment to amplitude-modulated wave power output.Matching network 4 mates the output impedance of the impedance of antenna 5 and driver module 3 simultaneously, and what make power output maximal efficiency passes to antenna 5 two ends.Antenna 5 adopts is convenient to be encapsulated in pcb antenna or the ceramic antenna in card.
During the utility model work, the subcarrier signal sub_carr of digital baseband signal sig_base and 1 output of subcarrier generation module, after signal modulation module 2, obtains modulation signal sig_mod.This modulation signal sig_mod, after driver module 3 and matching network 4, outputs to antenna 5 ends, and launches.
This modulation signal arrives after the antenna end of card reader, can superpose with the outside 13.56MHz carrier wave sending in card reader antenna, and the demodulator circuit that the waveform after stack is delivered to card reader carries out demodulation coding.
Referring to Fig. 4, it is the waveform of each stage signal.
Modulation signal sig_base can be expressed as
Wherein
for subcarrier frequency 848KHz,
for initial phase,
for baseband signal, subcarrier is carried out to amplitude modulation(PAM).
External subcarrier signal indication is
Wherein B is carrier signal amplitude, and the frequency of signal is
, be also 13.56MHz,
for initial phase.
The waveform of card reader antenna end is the stack of the amplitude-modulated signal receiving and the carrier signal self outwards sending
For prior art sub-carrier modulation mode, the waveform of card reader antenna end is in figure
shown in.At card reader end, generally adopt the demodulation mode of envelope detection, so
signal and of the prior art
the same, the waveform obtaining after envelope detection is
thereby, reach being correctly decoded base band data.
Claims (4)
1. an active label directly sends the modulating device of subcarrier, it is characterized in that: it comprises the subcarrier generation module (1) connecting successively, signal modulation module (2), driver module (3) and matching network (4), the output of matching network (4) connects antenna (5), baseband signal is input to signal modulation module (2), subcarrier generation module (1) produces 848KHz subcarrier signal, signal modulation module (2) carries out amplitude modulation(PAM) by subcarrier and digital baseband signal and obtains amplitude-modulated wave, driver module (3) is adjusted the power output of amplitude-modulated wave, matching network (4) mates the output impedance of the impedance of antenna (5) and driver module (3) simultaneously, what make power output maximal efficiency passes to antenna (5) two ends.
2. active label according to claim 1 directly sends the modulating device of subcarrier, it is characterized in that: described subcarrier generation module (1) obtains the 848KHz subcarrier signal of needs by phase-locked loop pll circuit and frequency divider.
3. active label according to claim 1 and 2 directly sends the modulating device of subcarrier, it is characterized in that: described driver module (3) is by changing the amplitude of signal or changing the driver output electric current of signal or the mode of both combinations realizes to the power output adjustment of amplitude-modulated wave.
4. active label according to claim 3 directly sends the modulating device of subcarrier, it is characterized in that: described antenna (5) adopts is convenient to be encapsulated in pcb antenna or the ceramic antenna in card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738641.8U CN203590255U (en) | 2013-11-21 | 2013-11-21 | Modulation device with active tag capable of sending subcarrier directly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738641.8U CN203590255U (en) | 2013-11-21 | 2013-11-21 | Modulation device with active tag capable of sending subcarrier directly |
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| CN203590255U true CN203590255U (en) | 2014-05-07 |
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| CN201320738641.8U Expired - Lifetime CN203590255U (en) | 2013-11-21 | 2013-11-21 | Modulation device with active tag capable of sending subcarrier directly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660536A (en) * | 2013-11-21 | 2015-05-27 | 北京同方微电子有限公司 | A conditioning system for directly sending subcarrier with active tag |
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2013
- 2013-11-21 CN CN201320738641.8U patent/CN203590255U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660536A (en) * | 2013-11-21 | 2015-05-27 | 北京同方微电子有限公司 | A conditioning system for directly sending subcarrier with active tag |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 100083 Beijing City, Haidian District Wudaokou Wangzhuang Road No. 1 Tongfang Technology Plaza D floor 18 West Patentee after: BEIJING TONGFANG MICROELECTRONICS Co.,Ltd. Address before: 100083 Haidian District Tsinghua Tongfang Technology Plaza, block A, floor 29, Beijing Patentee before: BEIJING TONGFANG MICROELECTRONICS Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |