CN1275840A - Radio frequency circuit for identifying mark - Google Patents
Radio frequency circuit for identifying mark Download PDFInfo
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- CN1275840A CN1275840A CN 99107822 CN99107822A CN1275840A CN 1275840 A CN1275840 A CN 1275840A CN 99107822 CN99107822 CN 99107822 CN 99107822 A CN99107822 A CN 99107822A CN 1275840 A CN1275840 A CN 1275840A
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- 238000007493 shaping process Methods 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 abstract 4
- 238000009966 trimming Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000006698 induction Effects 0.000 description 7
- 230000005389 magnetism Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 230000005672 electromagnetic field Effects 0.000 description 2
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Abstract
The radio-frequency circuit for identifying mark includes a resonance device; a rectification charging circuit connected with the resonance device; a signal regulating circuit electricall-connected with resonance device for trimming the signal output by antenna to the sequence signal; a control computing circuit respectively connected with rectification charging circuit and signal regulating circuit; a frequency divider which is connected with signal regulating circuit and its input end is connected with control computing circuit; a shift temporary memory respectively connected with frequency divider, control computing circuit and signal regulating circuit, after having been modulated said signal can be transmitted by antenna of resonance device. It is large in signal modulation amplitude long in transmission distance and accurate for fetching data.
Description
The relevant a kind of radio circuit that is used for identification mark of the present invention, particularly a kind of decipherment distance is long, it is accurate to read data, and the radio circuit of the stable identification mark of operating characteristic.
The radio circuit product of identification mark in the prior art, the check card system, storage check system, kinds of goods of gate inhibition's control system, occurrences in human life that extensively applied to gradually transports management system, animal identification recognition system or the like.More be widely used in the identification of the bar code of automobile key, commodity in recent years, therefore have commercial application potential.But existing radio-frequency (RF) identification mark mainly is the load impedance variation by control antenna, to transmit 01 corresponding data, whether appropriate this load impedance coupling is can influence the efficient that the radio frequency electromagnetic that receives arrives the DC power supply rectification charging, and card reader can only less than ten centimeters closely with the variation of the correct sensing load impedance of interior ability, very inconvenience of the actual use operation of user.
See also Fig. 1, it is the circuit block diagram that uses the radio-frequency (RF) identification mark of close induction type in the prior art, the circuit of the close induction type radio-frequency (RF) identification mark of Fig. 1 comprises the resonator 32 that is made of antenna 31, be connected with a rectifier charging circuit 121, rectifier charging circuit 121 is connected with a control logic circuit 62 again, afterwards, but the logical circuit 65 of connection one storage data, and rectifier charging circuit 121 is connected with a clock signal shaping circuit 61 and a modulation circuit 64 simultaneously.Wherein, rectifier charging circuit 121 connects a voltage limitator 12 and a charging capacitor 21 by a rectifier diode 11; Voltage limitator 12 is a Zener diode.In addition, control logic circuit 62 is connected with demodulator circuit 63 or the like, and then forms a close induction type identification mark circuit.
The identification mark circuit, behind the read range that enters card reader (sign is not arranged among the figure) (general about about ten centimeters), 31 on the antenna of its identification mark begins to receive the radiofrequency signal f by the card reader emission
0, and charging to the sustaining voltage of Zener diode (being voltage limitator 12) via 121 pairs of charging capacitors 21 of rectifier charging circuit, this voltage promptly forms voltage source Vcc, and the power supply of whole identification mark circuit is provided; Sequential shaping circuit 61 is with the radiofrequency signal f that receives simultaneously
0Amplified, and be shaped to digital clock signal, and then provide whole identification mark circuit required clock signal.
In addition, 65 of the logical circuits of storage data are delivered to modulation circuit 64 according to the control of certain time sequence signal in regular turn with the numerical data of a buffer or a memory body (indicating among the figure), and be emitted to a card reader from antenna 31, card reader desires to write data to identification mark, deliver to demodulator circuit 63 after receiving by the antenna in the identification mark circuit 31, and the running of the whole radio-frequency (RF) identification mark circuit of control logic circuit 62 controls.
About existing foreign patent technical elements, for existing close induction type radio-frequency (RF) identification mark circuit such as United States Patent (USP) 4,786, No. 907 " Transponder useful in a system foridentifying objects " a cases, when the modulation signal of its identification mark is sent from an antenna, be directly by switch of signal controlling, use the load impedance that changes antenna.The close induction type radio-frequency (RF) identification sign technology that this kind technology is disclosed as aforesaid existing radio-frequency (RF) identification mark circuit (as shown in Figure 1), wherein card reader sensing identification mark can go out corresponding " 0 ", " 1 " data because of antenna load impedance changes the electromagnetic field variation interpretation that is caused.
Yet, there are some shortcomings in this design, whether can influence the amplitude size of aerial coil induced electromotive force mainly due to the coupling of antenna load impedance, therefore, when the modulator of identification mark circuit sent data, the opening of control switch 51 (ON) closed (OFF), produce amplitude input signal not of uniform size, this characteristic will increase the complexity of sequential shaping circuit 61.And utilize control switch 51 to cause load impedance to change the micro-variation effect that often can only cause electromagnetic field merely, make card reader be difficult for sensing the variation of these trace, therefore the mode of utilizing control switch 51 load variations that causes to transmit data traditionally can only be applied in extremely short distance, for example less than ten centimeters, so use inconvenient, and accuracy rate is lower, remains to be improved.
Main purpose of the present invention be to provide a kind of data read accuracy high exempt from battery identification mark radio circuit.
Another object of the present invention is to provide the long angle of a kind of decipherment distance big identification mark radio circuit.
Another purpose of the present invention is to provide the radio circuit of the high identification mark of a kind of circuit working stability.
For achieving the above object, the present invention takes following measure:
One of characteristic of the radio circuit of identification mark of the present invention is respectively to be connected in series an opposite polarity rectifier diode respectively at the two ends of an antenna, and respectively with the other end of two diodes overlap joint to the positive terminal of a charging capacitor be connected an earth terminal.The positive terminal of one of them diode also connects a backward diode that is connected to ground, and the negative pole end of another diode then and connect one and can control ground connection whether switch by modulation signal.
The present invention takes following concrete structure:
The radio circuit of identification mark of the present invention comprises:
One resonator comprises an antenna;
One rectifier charging circuit connects resonator, in order to the in addition rectification of antenna institute acknowledge(ment) signal, and charges to a charge storage device;
One signal adjustment circuit is electrically connected resonator, is trimmed to clock signal in order to the signal with antenna output, with the demodulation and the modulation treatment of carrying out signal;
One control counting circuit connects rectifier charging circuit and signal adjustment circuit respectively, in order to control the clock signal that shaping is handled;
One frequency divider connects the output of signal adjustment circuit, and in order to clock signal frequency division in addition, the input of frequency divider connects the control counting circuit, accepts the control of control counting circuit;
One shift registor connects frequency divider and control counting circuit respectively, carries out the temporary action of signal, transmits signals to signal adjustment circuit, signal is launched by antenna through after the modulation treatment.
Wherein, also comprise a radio frequency amplitude limiter, the one end connects described rectifier charging circuit, and the other end connects described resonator.
Wherein, also comprise a modulation switch, the one end connects described resonator and described signal adjustment circuit, other end ground connection.
Wherein, described resonator is by an antenna and connect a capacitor and form.
Wherein, described signal adjustment circuit comprises:
One sequential shaping circuit, it connects an end of described resonator respectively, in order to the radiofrequency signal that resonator received is amplified and be shaped to digital clock signal, an output connects described control counting circuit, to provide the control counting circuit required clock signal;
One demodulator circuit connects an output of sequential shaping circuit, in order to the signal that antenna is received, via amplifying after the shaping in addition demodulation, signal is transferred to the control counting circuit;
One modulation circuit, an output of connection sequential shaping circuit in order to being modulated from the signal of a shift registor, is gone out by antenna transmission again.
Wherein, described control counting circuit comprises:
One control logic circuit, one input end connect the output of described signal adjustment circuit and rectifier charging circuit, and reception antenna is via the digital clock signal that amplifies after the shaping, and accept via the signal after the demodulation, to carry out the logical calculated operation;
The logical circuit of one storage data is connected with control logic circuit, in order to storing via the data after the logical calculated, and is connected with described shift registor, can store via the data after the computing.
Wherein, described rectifier charging circuit comprises at least two diodes, wherein the positive terminal of first diode connects the negative pole end of second diode, the positive terminal ground connection of second diode, the negative pole end of first diode connects a voltage limitator and a charging capacitor respectively, charging capacitor other end ground connection.
Wherein, described radio frequency amplitude limiter is a Zener diode.
Wherein, described voltage limitator is a Zener diode, is the direct current voltage limiter on the rectifier charging circuit.
Compared with prior art, the present invention has following effect:
Main characteristic of the present invention is that the electromotive force that produces by the coil-induced AC magnetism place of antenna can not be subjected to the modulation switch influence that data transmit when positive half cycle, therefore during transmitting data, can keep certain rectification charging efficient, and amplify the interference that the system sequence signal that takes out also can not be subjected to modulation signal by positive half cycle signal shaping, and the transmission of data modulated signal is to realize by the pressure drop size of controlling the negative half period antenna ends, signal variation ratio increases, therefore the transmitting range of the comparable aforementioned prior art of transmitting range is longer, and this circuit is without balancing cell.
Brief Description Of Drawings:
Fig. 1: be the calcspar of the close induction type identification mark radio circuit that uses in the prior art.
Fig. 2: be the calcspar of the identification mark radio circuit that the embodiment of the invention proposed.
Fig. 3: for cooperating the further circuit block diagram of Fig. 2 identification mark radio circuit in the embodiment of the invention.
Fig. 4 A: be the front end signal over the ground of antenna in the embodiment of the invention clock pulse waveform schematic diagram to time shaft.
Fig. 4 B: for antenna front end signal being carried out the waveform schematic diagram of the direct voltage source of the resulting stabilised efficiency of halfwave rectifier.
Fig. 4 C: for the antenna high-frequency signal being carried out the waveform schematic diagram of the system sequence signal that the sequential integer produced.
Fig. 4 D: be the pressure drop VL at aerial coil two ends, wherein negative half period part only when switch conduction ground connection amplitude be suppressed the waveform schematic diagram of state.
Reaching embodiment in conjunction with the accompanying drawings is described in detail as follows circuit of the present invention:
Identification mark radio circuit of the present invention, main feature is respectively to be connected in series an opposite polarity rectifier diode respectively in antenna ends, and respectively with positive terminal and the earth terminal of the other end of two diodes overlap joint to a charging capacitor, the positive terminal of one of them diode also connects a backward diode to ground, and the negative pole end of another diode also connects one and can control ground connection whether switch by modulation signal; And the principle of the present invention electromotive force that to be aerial coil induction AC magnetism place produce can not be subjected to the modulation switch influence that data transmit when positive half cycle, therefore during transmitting data, can keep certain rectification efficiency, and amplify the interference that the system sequence signal that takes out also can not be subjected to modulation signal by positive half cycle signal shaping, and the modulation of the radio frequency identification signal of this identification mark transmission is to finish by the pressure drop size of control negative half period antenna ends, because of but the modulation range of signal increases, so the comparable prior art of transmitting range is longer.
See also Fig. 2, Fig. 2 is the radio circuit calcspar of the identification mark that present embodiment proposed, wherein mainly comprise a resonator 32, resonator 32 comprises an antenna 31 (being shown in Fig. 3), one end of resonator 32 is connected with a rectifier charging circuit 10, include a diode 11 (as shown in Figure 3) in the rectifier charging circuit 10, be connected in an end of the antenna 31 of resonator 32, in order to the signal rectification in addition that antenna 31 is accepted.Another output of resonator 32 is connected with a signal adjustment circuit 60, is repaired in order to the signal that antenna 31 is exported, and becomes demodulation and the treatable waveform of modulation circuit.
In addition, include a control counting circuit 625 among Fig. 2, be connected in rectifier charging circuit 10 and signal adjustment circuit 60 simultaneously, in order to controlling the signal of shaping, and the running of the circuit of control radio-frequency (RF) identification mark; One frequency divider 67 is connected in the output of signal adjustment circuit 60, and in order to clock signal frequency division in addition, frequency divider 67 1 ends are connected in control counting circuit 625, accept the control of control counting circuit 625; One shift registor 66 is connected in frequency divider 67 and control counting circuit 625 simultaneously, carries out the temporary and displacement of signal, afterwards, signal is sent back signal adjustment circuit 60, signal modulation back is launched by antenna 31 again.
In addition, include a radio frequency amplitude limiter 145 in the radio-frequency (RF) identification mark circuit as Fig. 2 institute formula, the one end is connected in rectifier charging circuit 10, and the other end connects resonator 32, as an interchange amplitude limiter, can improve rectification charging efficient at the signal of antenna 31.On the other hand, the present invention's modulation switch 51 that more is connected, the one end connects resonator 32, the direct ground connection of the other end, its switch motion (being ON/OFF), promptly whether ground connection to be, is controlled by signal adjustment circuit.
In order further to describe radio-frequency (RF) identification mark circuit of the present invention in detail, see also Fig. 3, Fig. 3 cooperates the further circuit block diagram of radio-frequency (RF) identification mark of Fig. 2 in the embodiment of the invention.Wherein mainly disclose resonator 32, by an antenna 31 again and connect a capacitor, form a resonance circuit, carry out signal resonance and handle.
As shown in Figure 3, rectifier charging circuit 10 wherein includes several diodes 11,13, and wherein the positive terminal of diode 11 connects the negative pole end of another diode 13, and the positive terminal ground connection of diode 13.The negative pole end of diode 11 connects a voltage limitator 12 and a charging capacitor 21 respectively, and voltage limitator 12 is a Zener diode; One end ground connection of charging capacitor 21.In addition, the radio frequency amplitude limiter 145 among Fig. 3, mainly by one exchange amplitude limiter 15 itself and be connected with a diode 14 and form, exchanging amplitude limiter is a Zener diode.
Principal character of the present invention, be respectively to be connected in series an opposite polarity rectifier diode 11,14 respectively at antenna 31 two ends, and respectively the other end of two diodes 11,14 is overlapped positive terminal and earth terminal to charging capacitor 21, the positive terminal of diode 11 and connect the diode 13 of one one end ground connection wherein, and the negative pole end of diode 14 and connect and can control ground connection whether switch 51 by modulation signal, so the electromotive force that produces of antenna 31 coil-induced AC magnetism places can not be subjected to the modulation switch influence that data transmit when positive half cycle.
For the effect that illustrates that the present invention can produce, cooperate the disclosed waveform correlation figure of Fig. 4 to be illustrated: at first, when card reader transmission radiofrequency signal is responded to reception by the antenna 31 of " identification mark circuit ", produce a high frequency HF signal, shown in Fig. 4 A, it is the end front end signal waveform schematic diagram over the ground of antenna in the present embodiment, no matter modulation signal is controlled at the state that opens or closes with modulation switch 51, all can not impact high frequency HF signal.Therefore, the halfwave rectifier that high frequency HF signal carries out is also charged, can obtain the direct voltage source of a stabilised efficiency, this voltage source Vcc is provided as the power supply of whole identification mark circuit, this power supply signal waveform is shown in Fig. 4 B, halfwave rectifier and the charging of Fig. 4 B for carrying out from front end HF, the oscillogram that obtains.
In addition, the radiofrequency signal f of 61 couples of front end HF of sequential shaping circuit
0Amplify and be shaped to digital clock signal, as the system sequence signal of whole identification mark circuit, this signal also can not be subjected to the influence of modulation signal, and the clock signal of system is shown in Fig. 4 C, as seen from the figure, it also can not be subjected to the influence of modulation signal.In addition, the logical circuit 65 of shift registor 66, frequency divider 67 and storage data, then the data of buffer or memory body are delivered to modulation circuit 64 in regular turn according to certain time sequence, through modulation switch 51, from antenna 31 emissions one radiofrequency signal, and give the card reader reception, if card reader desires to write data to identification mark, be to radiofrequency signal f
0Modulate the back emission, deliver to demodulator circuit 63 processing after antenna 31 receptions by the identification mark circuit, and control the running of whole " radio-frequency (RF) identification mark " by control logic circuit 62.
Shown in Fig. 4 D, it is the waveform schematic diagram of the pressure drop VL at antenna 31 coil two ends, and wherein only when modulation switch 51 conducting ground connection, amplitude can be suppressed the negative half period part, and wherein, also expression has the respective waveforms of modulation switch 51.The transmission of data modulated signal is that size by the negative half period of control antenna two ends pressure drop is to recently finishing among the present invention.In other words circuit of the present invention is to utilize electromagnetic negative half period to transmit signal, utilize positive half cycle to do rectification charging and generation system sequence signal, and the open and close of modulation switch 51 only can influence the signal of negative half period, can't influence the signal of positive half period, be the interference that rectification charging efficient or system sequence signal can not be subjected to modulation signal therefore.And can produce the antenna end voltage of contrast greatly because negative half period is influenced by modulation switch 51, therefore the transmissible distance of circuit of the present invention is longer.
More than narration is to borrow preferred embodiment that architectural feature of the present invention is described, is not to be used to limit protection scope of the present invention.
Claims (16)
1, a kind of radio circuit of identification mark comprises:
One resonator comprises an antenna; It is characterized in that, also comprise:
One rectifier charging circuit connects resonator, in order to the in addition rectification of antenna institute acknowledge(ment) signal, and charges to a charge storage device;
One signal adjustment circuit is electrically connected resonator, is trimmed to clock signal in order to the signal with antenna output, with the demodulation and the modulation treatment of carrying out signal;
One control counting circuit connects rectifier charging circuit and signal adjustment circuit respectively, in order to control the clock signal that shaping is handled;
One frequency divider connects the output of signal adjustment circuit, and in order to clock signal frequency division in addition, the input of frequency divider connects the control counting circuit, accepts the control of control counting circuit;
One shift registor connects frequency divider and control counting circuit respectively, carries out the temporary action of signal, transmits signals to signal adjustment circuit, signal is launched by antenna through after the modulation treatment.
2, circuit according to claim 1 is characterized in that, also comprises a radio frequency amplitude limiter, and the one end connects described rectifier charging circuit, and the other end connects described resonator.
3, circuit according to claim 1 is characterized in that, also comprises a modulation switch, and the one end connects described resonator and described signal adjustment circuit, other end ground connection.
4, circuit according to claim 1 is characterized in that, described resonator is by an antenna and connect a capacitor and form.
5, circuit according to claim 1 is characterized in that, described signal adjustment circuit comprises:
One sequential shaping circuit, it connects an end of described resonator respectively, in order to the radiofrequency signal that resonator received is amplified and be shaped to digital clock signal, an output connects described control counting circuit, to provide the control counting circuit required clock signal;
One demodulator circuit connects an output of sequential shaping circuit, in order to the signal that antenna is received, via amplifying after the shaping in addition demodulation, signal is transferred to the control counting circuit;
One modulation circuit, an output of connection sequential shaping circuit in order to being modulated from the signal of a shift registor, is gone out by antenna transmission again.
6, circuit according to claim 5 is characterized in that, described control counting circuit comprises:
One control logic circuit, one input end connect the output of described signal adjustment circuit and rectifier charging circuit, and reception antenna is via the digital clock signal that amplifies after the shaping, and accept via the signal after the demodulation, to carry out the logical calculated operation;
The logical circuit of one storage data is connected with control logic circuit, in order to storing via the data after the logical calculated, and is connected with described shift registor, can store via the data after the computing.
7, circuit according to claim 1, it is characterized in that, described rectifier charging circuit comprises at least two diodes, wherein the positive terminal of first diode connects the negative pole end of second diode, the positive terminal ground connection of second diode, the negative pole end of first diode connects a voltage limitator and a charging capacitor respectively, charging capacitor other end ground connection.
8, circuit according to claim 2 is characterized in that, described radio frequency amplitude limiter is a Zener diode.
9, circuit according to claim 7 is characterized in that, described voltage limitator is a Zener diode, is the direct current voltage limiter on the rectifier charging circuit.
10, a kind of radio circuit of identification mark includes:
One resonator comprises an antenna; It is characterized in that, also comprise:
The signal that antenna received can be carried out the processing of resonance;
One rectifier charging circuit connects resonator, is required power supply status in order to the signal rectification that antenna is accepted;
One signal adjustment circuit connects the output of resonator, is trimmed to clock signal in order to the signal with resonator output, export/modulating/demodulating of input signal handles;
One control counting circuit connects rectifier charging circuit and signal adjustment circuit respectively, has adjusted the signal of handling in order to calculation control, and the control entire circuit;
One frequency divider connects the output of signal adjustment circuit, and in order to clock signal frequency division in addition, the frequency divider other end connects the control counting circuit;
One shift registor connects frequency divider and control counting circuit respectively, carries out the temporary and shift motion of signal, transmits signals to signal adjustment circuit, and modulation is after launched by antenna;
One radio frequency amplitude limiter, the one end connects rectifier charging circuit, and the other end connects resonator, exchanges amplitude limiter as one;
One modulation switch, the one end connects resonator, other end ground connection, its switch motion is controlled by signal adjustment circuit.
11, circuit according to claim 10 is characterized in that, the antenna in the described resonator also connects a capacitor.
12, circuit according to claim 10 is characterized in that, described signal adjustment circuit comprises:
One sequential shaping circuit connects resonator, in order to the radiofrequency signal that resonator received is amplified and be shaped to digital clock signal;
One demodulator circuit connects an output of sequential shaping circuit, in order to the signal that antenna received, via being delivered to described control counting circuit after the demodulation;
One modulation circuit, an output of connection sequential shaping circuit, in order to the signal of institute's desire emission is modulated, the antenna by resonator sends out again.
13, circuit according to claim 10 is characterized in that, described control counting circuit comprises:
One control logic circuit, one input end connects the output of signal adjustment circuit and rectifier charging circuit, receives the digital clock signal after shaping, and accepts via the signal after the demodulation, to carry out the logical calculated operation;
The logical circuit of one storage data is connected with control logic circuit, in order to storing via the data after the logical calculated, and is connected with described shift registor, can store via the data after the computing.
14, circuit according to claim 10, it is characterized in that, described rectifier charging circuit, include at least two diodes, wherein the positive terminal of first diode connects the negative pole end of second diode, the negative pole end ground connection of second diode, the negative pole end of first diode connect a voltage limitator and a charging capacitor respectively, an end ground connection of charging capacitor.
15, circuit according to claim 10 is characterized in that, described radio frequency amplitude limiter is a Zener diode, in order to the limiting AC signal.
16, circuit according to claim 14 is characterized in that, described voltage limitator is a Zener diode, is the direct current voltage limiter on the rectifier charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107822 CN1123986C (en) | 1999-05-31 | 1999-05-31 | Radio frequency circuit for identifying mark |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99107822 CN1123986C (en) | 1999-05-31 | 1999-05-31 | Radio frequency circuit for identifying mark |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1275840A true CN1275840A (en) | 2000-12-06 |
| CN1123986C CN1123986C (en) | 2003-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99107822 Expired - Fee Related CN1123986C (en) | 1999-05-31 | 1999-05-31 | Radio frequency circuit for identifying mark |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1123986C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309179C (en) * | 2002-04-17 | 2007-04-04 | 盛群半导体股份有限公司 | Recognition code transmission method and circuit arrangement |
| CN100428273C (en) * | 2006-07-31 | 2008-10-22 | 华为技术有限公司 | Decoder and radio frequency card |
| US7508305B2 (en) | 2003-12-26 | 2009-03-24 | Semiconductor Energy Laboratory Co., Ltd. | Packing material, tag, certificate, paper money, and securities |
| US7768405B2 (en) | 2003-12-12 | 2010-08-03 | Semiconductor Energy Laboratory Co., Ltd | Semiconductor device and manufacturing method thereof |
-
1999
- 1999-05-31 CN CN 99107822 patent/CN1123986C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309179C (en) * | 2002-04-17 | 2007-04-04 | 盛群半导体股份有限公司 | Recognition code transmission method and circuit arrangement |
| US7768405B2 (en) | 2003-12-12 | 2010-08-03 | Semiconductor Energy Laboratory Co., Ltd | Semiconductor device and manufacturing method thereof |
| CN1627518B (en) * | 2003-12-12 | 2012-09-05 | 株式会社半导体能源研究所 | Semiconductor device and its manufacture method |
| US7508305B2 (en) | 2003-12-26 | 2009-03-24 | Semiconductor Energy Laboratory Co., Ltd. | Packing material, tag, certificate, paper money, and securities |
| US7893837B2 (en) | 2003-12-26 | 2011-02-22 | Semiconductor Energy Laboratory Co., Ltd. | Packing material, tag, certificate, paper money, and securities |
| CN100428273C (en) * | 2006-07-31 | 2008-10-22 | 华为技术有限公司 | Decoder and radio frequency card |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1123986C (en) | 2003-10-08 |
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Addressee: Gao Longxin Document name: Notification of Termination of Patent Right |
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Granted publication date: 20031008 Termination date: 20110531 |