CN104506169A - Oscillator applied to radio frequency identification - Google Patents
Oscillator applied to radio frequency identification Download PDFInfo
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- CN104506169A CN104506169A CN201410737451.3A CN201410737451A CN104506169A CN 104506169 A CN104506169 A CN 104506169A CN 201410737451 A CN201410737451 A CN 201410737451A CN 104506169 A CN104506169 A CN 104506169A
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Abstract
The embodiment of the invention discloses an oscillator applied to radio frequency identification. The oscillator comprises a band-gap reference source module, a voltage control module, a charging discharging module, a first comparator, a second comparator and a logic processing module, wherein the band-gap reference source module is used for generating reference voltages VH and VL and reference currents Iref+ and Iref-; the voltage control module is used for supplying a control voltage and is used for controlling the switching on and off of a NMOS (N-channel Metal Oxide Semiconductor) tube and a PMOS (P-channel Metal Oxide Semiconductor) tube; the charging discharging module is used for charging or discharging according to the switching on and off conditions of the NMOS tube and the PMOS tube and supplying output voltage to the first comparator and the second comparator; the first comparator is used for comparing the output voltage with the reference voltage VH and outputting a first signal; the second comparator is used for comparing the output voltage with the reference voltage VL and outputting a second signal; the logic processing module is used for performing logic processing on the first signal and the second signal and outputting a control voltage. The triangular wave in random frequency is formed, so that the capability of generating high-randomness random number is increased.
Description
Technical field
The present invention relates to technical field of RFID, especially relate to a kind of oscillator being applied to radio-frequency (RF) identification.
Background technology
Radio-frequency (RF) identification (Radfo Frequency Identificatiom, RFID) technology is a kind of contactless automatic identification technology, and it is by electromagnetic wave or inductance misfortune conjunction mode transmission of signal, to complete the automatic identification to destination object.Compared with other automatic identification technology such as bar code, magnetic card, Contact Type Ic Card, namely RFID technique have identifying need not manual intervention, can identify that multiple target, information storage are large, can work in the advantages such as various adverse circumstances simultaneously.Therefore, RFID technique has been widely used in the fields such as fixed capital management, production line automation, animal and vehicle identification, highway toll, gate control system, storage, commodity counterfeit prevention, airline baggage management, container management.Typical radio-frequency recognition system can be divided into label, reader and Back end data treatment system three parts.
In technical field of RFID, carrying out anti-collision knowledge method for distinguishing to label has multiple.Wherein some method is as pure ALOHA algorithm, random slot algorithm etc., needs to produce in the label random number, carrys out the time slot of distributing labels according to the size of this random number.Due to the size that time slot allocation is based on produced random number, therefore the stochastic behaviour of this random number directly affects the quality of label anti-confliction performance, thus affects the recognition efficiency of radio-frequency recognition system.
In radio-frequency recognition system, in order to ensure the fail safe of the data that the data transmitted between card reader and label and inside tags are stored, all data transmitted between card reader and label all need to be encrypted.In the cryptographic algorithm used, in order to protect the key of safety certification, need generation certain length and meeting the random number of certain stochastic behaviour requirement.Equally, the stochastic behaviour of this random number is also relevant with the complete intensity of the data of this security certification system.
As can be seen here, some functions that reader chip needs frequency detecting and random number to produce, for the anti-collision of radio-frequency recognition system and the data security of the system of guarantee most important.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the invention provides a kind of oscillator being applied to radio-frequency (RF) identification, by forming the triangular wave of a random frequency, improve the ability of random number producing high randomness, have that circuit structure is simple, cost is little, low in energy consumption, area is little, be convenient to integrated advantage.
In order to solve the problem, the present invention proposes a kind of oscillator being applied to radio-frequency (RF) identification, described oscillator comprises:
Band-gap reference source module, for generation of reference voltage V H, VL and reference current Iref+, Iref-;
Voltage control module, for providing control voltage Vctrl, for conducting or the closedown of the conducting or closedown and PMOS that control NMOS tube;
Charging and discharging module, for according to the conducting of NMOS tube or the conducting of closedown and PMOS or the situation of closedown, carries out charge or discharge, and provides output voltage VO UT for the first comparator, the second comparator;
First comparator, for being compared by output voltage VO UT and reference voltage V H, exports the first signal;
Second comparator, for being compared by output voltage VO UT and reference voltage V L, exports secondary signal;
Logic processing module, for carrying out logical process to the first signal and secondary signal, exports control voltage Vctrl.
Preferably, described output voltage VO UT is the output voltage of a triangular wave.
Preferably, described reference voltage V H is the top level of triangular wave, and reference voltage V L is the end line voltages of the triangular wave of triangular wave.
Preferably, the absolute value equal direction of described reference current Iref+ and Iref-is contrary.
Preferably, described reference current Iref+ is charged to charging and discharging module C1 by R1.
Preferably, described reference current Iref-is discharged to charging and discharging module C1 by R1.
In embodiments of the present invention, by forming the triangular wave of a random frequency, triangular wave can be used for producing stabilized frequency square wave, conveniently compare with carrier frequency, be used for detecting frequency, or random distribution process is carried out to electric capacity C1, the ability of the random number producing high randomness can be improved, have that circuit structure is simple, cost is little, low in energy consumption, area is little, be convenient to integrated advantage; There is configurability, only need to adjust the bit wide of counter and pseudorandom number generator and pseudorandom number generator multinomial according to the figure place of produced random number, the random number of different bit wide can be produced; Utilize oscillator frequency of oscillation instability and reset signal generation time, retention time unfixed feature in different power up when powering on initial on sheet, produce the seed of pseudorandom number generator, the seed that same chip is produced in different power up presents higher randomness.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the composition schematic diagram being applied to the oscillator of radio-frequency (RF) identification of the embodiment of the present invention;
Fig. 2 is the triangular wave schematic diagram produced in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the composition schematic diagram being applied to the oscillator of radio-frequency (RF) identification of the embodiment of the present invention, and as shown in Figure 1, this oscillator comprises:
Band-gap reference source module, for generation of reference voltage V H, VL and reference current Iref+, Iref-;
Voltage control module, for providing control voltage Vctrl, for conducting or the closedown of the conducting or closedown and PMOS that control NMOS tube;
Charging and discharging module, for according to the conducting of NMOS tube or the conducting of closedown and PMOS or the situation of closedown, carries out charge or discharge, and provides output voltage VO UT for the first comparator, the second comparator;
First comparator, for being compared by output voltage VO UT and reference voltage V H, exports the first signal;
Second comparator, for being compared by output voltage VO UT and reference voltage V L, exports secondary signal;
Logic processing module, for carrying out logical process to the first signal and secondary signal, exports control voltage Vctrl.
Wherein, output voltage VO UT is the output voltage of a triangular wave; Reference voltage V H is the top level of triangular wave, and reference voltage V L is the end line voltages of the triangular wave of triangular wave.
The absolute value equal direction of reference current Iref+ and Iref-is contrary, and reference current Iref+ is charged to charging and discharging module C1 by R1; Reference current Iref-is discharged to charging and discharging module C1 by R1.
In the embodiment of the present invention, produce reference voltage V H, VL by band-gap reference source module, and reference current Iref+ and Iref-.
Workflow first controls NMOS tube conducting, PMOS closedown by control voltage Vctrl, and allow reference current Iref+ be charged to charging and discharging module C1 by R1, now, the voltage linear of output voltage VO UT rises; Until during output voltage VO UT> reference voltage V H, control voltage Vctrl controls NMOS tube closedown, PMOS conducting, is discharged by R1 by reference current Iref-to charging and discharging module C1, and the voltage linear of output voltage VO UT declines; Until during output voltage VO UT< reference voltage V L, control NMOS tube conducting by control voltage Vctrl, PMOS is closed, allow reference current Iref+ again be charged to charging and discharging module C1 by R1.Do not stop to follow the output that bad formation output voltage VO UT is a triangular wave according to this flow process, as shown in Figure 2.
In embodiments of the present invention, by forming the triangular wave of a random frequency, triangular wave can be used for producing stabilized frequency square wave, conveniently compare with carrier frequency, be used for detecting frequency, or random distribution process is carried out to electric capacity C1, the ability of the random number producing high randomness can be improved, have that circuit structure is simple, cost is little, low in energy consumption, area is little, be convenient to integrated advantage; There is configurability, only need to adjust the bit wide of counter and pseudorandom number generator and pseudorandom number generator multinomial according to the figure place of produced random number, the random number of different bit wide can be produced; Utilize oscillator frequency of oscillation instability and reset signal generation time, retention time unfixed feature in different power up when powering on initial on sheet, produce the seed of pseudorandom number generator, the seed that same chip is produced in different power up presents higher randomness.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, storage medium can comprise: read-only memory (ROM, Read OnlyMemory), random access memory (RAM, Random Access Memory), disk or CD etc.
In addition, above the oscillator being applied to radio-frequency (RF) identification that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. be applied to an oscillator for radio-frequency (RF) identification, it is characterized in that, described oscillator comprises:
Band-gap reference source module, for generation of reference voltage V H, VL and reference current Iref+, Iref-;
Voltage control module, for providing control voltage Vctrl, for conducting or the closedown of the conducting or closedown and PMOS that control NMOS tube;
Charging and discharging module, for according to the conducting of NMOS tube or the conducting of closedown and PMOS or the situation of closedown, carries out charge or discharge, and provides output voltage VO UT for the first comparator, the second comparator;
First comparator, for being compared by output voltage VO UT and reference voltage V H, exports the first signal;
Second comparator, for being compared by output voltage VO UT and reference voltage V L, exports secondary signal;
Logic processing module, for carrying out logical process to the first signal and secondary signal, exports control voltage Vctrl.
2. be applied to the oscillator of radio-frequency (RF) identification as claimed in claim 1, it is characterized in that, described output voltage VO UT is the output voltage of a triangular wave.
3. be applied to the oscillator of radio-frequency (RF) identification as claimed in claim 2, it is characterized in that, described reference voltage V H is the top level of triangular wave, and reference voltage V L is the end line voltages of the triangular wave of triangular wave.
4. be applied to the oscillator of radio-frequency (RF) identification as claimed in claim 1, it is characterized in that, the absolute value equal direction of described reference current Iref+ and Iref-is contrary.
5. be applied to the oscillator of radio-frequency (RF) identification as claimed in claim 4, it is characterized in that, described reference current Iref+ is charged to charging and discharging module C1 by R1.
6. be applied to the oscillator of radio-frequency (RF) identification as claimed in claim 4, it is characterized in that, described reference current Iref-is discharged to charging and discharging module C1 by R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410737451.3A CN104506169A (en) | 2014-12-04 | 2014-12-04 | Oscillator applied to radio frequency identification |
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| CN201410737451.3A CN104506169A (en) | 2014-12-04 | 2014-12-04 | Oscillator applied to radio frequency identification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068700A1 (en) * | 2016-10-11 | 2018-04-19 | 卓捷创芯科技（深圳）有限公司 | Half-duplex rfid oscillation maintaining circuit for generating pulse by comparator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144218A (en) * | 1989-10-25 | 1992-09-01 | U.S. Philips Corporation | Device for determining the charge condition of a battery |
| CN101877571A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Multi-frequency oscillator applied to electronic ballast |
| CN102411393A (en) * | 2011-11-02 | 2012-04-11 | 四川和芯微电子股份有限公司 | Reference current source circuit and system |
-
2014
- 2014-12-04 CN CN201410737451.3A patent/CN104506169A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144218A (en) * | 1989-10-25 | 1992-09-01 | U.S. Philips Corporation | Device for determining the charge condition of a battery |
| CN101877571A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Multi-frequency oscillator applied to electronic ballast |
| CN102411393A (en) * | 2011-11-02 | 2012-04-11 | 四川和芯微电子股份有限公司 | Reference current source circuit and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068700A1 (en) * | 2016-10-11 | 2018-04-19 | 卓捷创芯科技（深圳）有限公司 | Half-duplex rfid oscillation maintaining circuit for generating pulse by comparator |
| US10685272B2 (en) | 2016-10-11 | 2020-06-16 | Excelio Technology (Shenzhen) Co., Ltd. | Oscillation maintenance circuit with comparator-based pulse generation in half-duplex RFID transponders |
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