CN101364790A - Method for realizing ASK modulation bu changing driver source voltage - Google Patents
Method for realizing ASK modulation bu changing driver source voltage Download PDFInfo
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- CN101364790A CN101364790A CNA2007101199741A CN200710119974A CN101364790A CN 101364790 A CN101364790 A CN 101364790A CN A2007101199741 A CNA2007101199741 A CN A2007101199741A CN 200710119974 A CN200710119974 A CN 200710119974A CN 101364790 A CN101364790 A CN 101364790A
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Amplitude Modulation (AREA)
Abstract
In the RF application field, 13.56 Mhz is a common frequency, and the load wave frequencies in the present international standard ISO/IEC14443 and ISO/IEC15693 are 13.56 Mhz. In order to achieve RF data communication, corresponding modulation/demodulation basis is prescribed in the standard. The invention discloses a method for achieving ASK modulation by changing the power voltage of a driver. The method is characterized in that: (1) the value of the power voltage is changed in an allowable power supply range of the driver, and an input carrier signal passes through the driver to change the amplitude of the outputted carrier signal; (2) the maximal value of the allowable power voltage of the driver is the maximal output amplitude of the signal; (3) the minimal value of the allowable power voltage of the driver is the minimal output amplitude of the signal; (4) the maximal output amplitude and the minimal output amplitude of the signal are determined according a modulation ratio (x%, x ranging from 0 to 100), and the 100% modulation represents the off state of the power supply of the driver; and (5) power amplification can be carried out again if an ideal drive capacity of the output signal is not achieved.
Description
Technical field
The invention provides a kind of method, be mainly used in radio-frequency technique (RFID) field by change drive electric source voltage realization ASK modulation.
Background technology
Along with the microelectric technique fast development, the radio-frequency recognition system that closely is coupled is used also more and more widely.Existing in the world at present a lot of successful application case, for example electronic entrance ticket of large-scale activity, E-Passport, parking lot management, city all-purpose cards or the like.In China, along with the enforcement of China second-generation identity card engineering and the continuous popularization of card system, the radio-frequency (RF) identification industrial chain reaches its maturity, and relevant standard is also progressively perfect, and key technology is also progressively stable.
The digital am technology more definitely, can be called amplitude keying (ASK:Amplitude Shift Key) from technical standpoint, also can cry amplitude shift keying.Because as the signal of modulation signal is a series of 1 and 0, can be with the amplitude of these signal controlling carrier waves, thus reach the purpose of modulation, when being " 1 " yard when signal, carrier wave is output as A cos wot; When signal is " 0 " when sign indicating number, carrier wave is output as 0 or satisfactory amplitude.Fig. 3 is that MILLER sign indicating number 100% ASK realizes schematic diagram, and wherein OFF is that switch disconnects, and ON is closed.
The present invention mainly provides a kind of by changing the method that drive electric source voltage realizes that ASK modulates.
Summary of the invention
The present invention mainly provides a kind of by changing the method that drive electric source voltage realizes that ASK modulates, following description:
1, change supply voltage value in the supply district that driver allows, input carrier signal makes the amplitude of outgoing carrier signal change according to supply voltage through behind the driver.
2, the maximum of the supply voltage that driver allowed is exactly the maximum output amplitude of signal.
3, the minimum value of the supply voltage that driver allowed is exactly the minimum output amplitude of signal.
4, according to the maximum output amplitude and the minimum output amplitude of modulation ratio (x% is between the x value 0～100) decision signal, 100% is modulated to the drive power supply off state.
If the driving force of 5 above output signals is not enough, can carry out power amplification once more.
Major advantage of the present invention is to realize that simple, reliable operation, parameter adjustment are flexible, applicable to the ASK pattern that requires in the multiple international standard.
The accompanying drawing invention
1, drive circuit is realized schematic diagram
2, driver output end waveform example
3, MILLER sign indicating number 100%ASK realizes schematic diagram
Embodiment
The present invention can realize according to following steps:
1, selecting driver, can be popular in the market CMOS, NMOS logical device or discrete, integrated amplifier device.
If it is not very big that 2 drive currents require, can consider to increase current driving ability with the output in parallel of several logical devices of the same type.If the drive current that requires is bigger, should use power device.
3, as shown in Figure 1, a D.C. regulated power supply is provided, by the modulation amplitude initialization circuit, determine to offer the minimum power supply voltage, numerical value of driver, this numerical value carries out dividing potential drop by control circuit to D.C. regulated power supply to be realized, different modulation amplitudes causes minimum power supply voltage, numerical value difference, and control circuit can be according to the different minimum power supply voltage, numerical value of modulation amplitude control output; Control circuit can also realize making drive electric source voltage in D.C. regulated power supply full scale and the work of two points of minimum power supply voltage.These two working points can be realized switching by control circuit by modulated signals (digital signal), and the D.C. regulated power supply of control circuit output is directly connected to the drive power supply end.
4, do not have the input carrier signal of modulation to be connected to the input pin of driver, driver is realized the ASK modulation according to the amplitude of the size control outgoing carrier signal of power supply with this, and output promptly is the carrier signal that has modulation intelligence, sees Fig. 2.
5, according to the supply of the supply voltage of index request Control Driver, just can obtain the modulation amplitude that requires easily.
Claims (3)
1. one kind is passed through to change the method that drive electric source voltage is realized the ASK modulation, it is characterized in that adjusting in the drive electric source voltage scope supply voltage of driver, modulates with the ASK that realizes different amplitude requirement.
2. according to claim 1 a kind of by changing the method that drive electric source voltage realizes that ASK modulates, it is characterized in that driver is CMOS, NMOS logical device or discrete, integrated amplifier device.
3. according to claim 1 a kind of by changing the method that drive electric source voltage realizes that ASK modulates, the voltage that it is characterized in that drive power supply can be adjusted in the high power supply voltage scope at the low supply voltage that allows, but the arbitrfary point operate as normal of driver in this scope; In addition, according to the requirement of ASK modulation, drive electric source voltage will be high power supply voltage and two points of low supply voltage, according to modulated signals (digital signaling zero or 1) Control Driver power supply output high power supply voltage or low supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101199741A CN101364790A (en) | 2007-08-06 | 2007-08-06 | Method for realizing ASK modulation bu changing driver source voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101199741A CN101364790A (en) | 2007-08-06 | 2007-08-06 | Method for realizing ASK modulation bu changing driver source voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101364790A true CN101364790A (en) | 2009-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101199741A Pending CN101364790A (en) | 2007-08-06 | 2007-08-06 | Method for realizing ASK modulation bu changing driver source voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101364790A (en) |
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2007
- 2007-08-06 CN CNA2007101199741A patent/CN101364790A/en active Pending
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| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
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Open date: 20090211 |
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| DD01 | Delivery of document by public notice |
Addressee: Gai Ana Document name: Notification that Application Deemed not to be Proposed |