CN101706880B - Receiver of ultra high frequency radio frequency identification reader - Google Patents
Receiver of ultra high frequency radio frequency identification reader Download PDFInfo
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- CN101706880B CN101706880B CN2009102232197A CN200910223219A CN101706880B CN 101706880 B CN101706880 B CN 101706880B CN 2009102232197 A CN2009102232197 A CN 2009102232197A CN 200910223219 A CN200910223219 A CN 200910223219A CN 101706880 B CN101706880 B CN 101706880B
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Abstract
The invention relates to a receiver of an ultra high frequency radio frequency identification reader, a signal channel of the receiver comprises a frequency conversion module and a signal processing module, the frequency conversion module in one signal channel comprises three frequency converters, and the signal processing module comprises two processing modules. The first frequency converter and the second frequency converter in the frequency conversion module are connected, the first processing module in the signal processing module is connected between the second frequency converter and the third frequency converter, the third frequency converter is further connected with the second processing module of the signal processing module, and the first frequency converter and the second frequency converter adopt AC coupling for filtering DC components in frequency conversion signals. The use of the receiver of the reader can realize the separation of the received signals from low-frequency 1/f noise and DC offset, reduce the impact on the performances of the receiver, improve the identification performance of the receiver of the reader, effectively reduce the noise coefficient of the receiver, improve the sensitivity of the receiver and ensure the accuracy of the signals received by the receiver of the reader.
Description
Technical field:
The invention belongs to the REID field, specifically relate to a kind of receiver of super high frequency radio frequency recognition read-write machine.
Background technology:
RF identification (RFID) technology is a kind of contactless automatic identification technology.In radio-frequency recognition system, read write line sends radiofrequency signal and activates RF tag, and receives the radiofrequency signal of returning from label, thereby reaches the purpose of identification.
In the passive ultra-high frequency radio-frequency recognition system, the not charged source of label self, needing the read write line transmitter to send powerful continuous carrier is the tag circuit power supply.Owing to there is the leakage of signal between the read write line transmitted from transmitter to receiver, the read write line receiver also can receive very strong leakage carrier signal when receiving the label return signal.And label adopts the mode of backscattered modulation usually to the reverse signal link of read write line receiver, and the signal energy that turns back to the read write line receiver is very faint.Therefore, the radio-frequency identification reader/writer receiver need have bigger input dynamic range and high reception sensitivity.As shown in Figure 1; Usually ultrahigh frequency identification read write line receiver adopts direct down coversion (zero intermediate frequency) structure; Promptly through of the local oscillated signal mixing of a frequency converter with radiofrequency signal that receives and same frequency; Be direct down-conversion-to the base band frequency range, after the frequency conversion the base band frequency range by signal processing module to the radiofrequency signal that receives amplify, signal Processing such as filtering.
For example; Granted publication number is: the Chinese utility model patent of CN 2904118Y just discloses the remote passive RF label read write line of a kind of high speed; It comprises antenna, circulator, radio-frequency transmissions passage, radio frequency reception channel, field programmable gate array, single-chip microcomputer, serial line interface, combined communication interface and phase-locked loop frequency synthesizer; This radio frequency label read-write machine adopts direct zero intermediate frequency demodulator circuit structure, from the echoed signal of electronic tag, directly demodulates the signal of electronic tag.Owing to carry out signal Processing in the base band frequency range, can receive the influence of the 1/f noise of electron device, recognition effect is not good.
And for example publication number is the Chinese invention patent of CN 101388082A; It discloses a kind of super high frequency electronic label recognizer; Comprise antenna, RF interface module and baseband processing module, radio frequency interface module adopts the zero intermediate frequency circuit structure, and baseband processing module has adopted the baseband signal modu platform of dynamic configurable analogue signal processor as recognizer; Adopted the programmable analog System on Chip/SoC to separate leveling platform as the baseband signal of read write line; Though this band electronic tag recognizer is simple in structure, be easy to realize that still there are many problems in the structure of this down coversion for once.Because signal processing module is in the work of base band frequency range, the noise of its generation can have very big influence to the receiver overall performance.Because it is very low to receive signal frequency in the base band frequency range, through baseband signal processing module the time, can receive the influence of electron device low frequency 1/f noise, this low-frequency noise power is higher, makes the sensitivity of receiver identification descend.In addition, baseband signal processing module also is vulnerable to the influence of device DC maladjustment, and it is saturated to cause signal to amplify path, influences the operate as normal of receiver.
Summary of the invention:
The object of the invention is, provides a kind of and can reduce the influence that 1/f noise and DC maladjustment produce the read write line receiver, improves a kind of novel super high frequency radio frequency identification receiver of read write line receiver sensitivity.
For realizing above-mentioned purpose; The invention provides a kind of receiver of ultra high frequency radio frequency identification reader; Comprise frequency-variable module and signal processing module in the signal path of this receiver; It is characterized in that: the said frequency-variable module in the signal paths comprises three frequency converters, and said signal processing module comprises two processing modules.
Optimal technical scheme of the present invention is: first frequency converter in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader is connected with second frequency converter; Connect first processing module in the said signal processing module between said second frequency converter and the 3rd frequency converter; Said the 3rd frequency converter connects second processing module of said signal processing module again, adopts the DC component in the AC coupling filtering frequency variation signal between said first frequency converter and second frequency converter.
Another optimal technical scheme of the present invention is: first frequency converter is that local oscillation signal with radiofrequency signal that receives and same frequency carries out mixing in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader, directly the radio frequency signal frequency that receives is down-converted to the base band frequency range by radio frequency band.
The 3rd optimal technical scheme of the present invention is: second frequency converter is with being converted to the reception signal of base band frequency range and the local oscillation signal of IF-FRE carries out mixing through first frequency converter in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader, and the reception signal of base band frequency range is upconverted to the intermediate frequency frequency range.
The 4th optimal technical scheme of the present invention is: first processing module of the signal processing module of said a kind of receiver of ultra high frequency radio frequency identification reader is signal Processing such as amplification that the reception signal that upconverts to the intermediate frequency frequency range through second frequency converter is carried out, filtering.
The 5th optimal technical scheme of the present invention is: the 3rd frequency converter is that the reception signal down coversion after handling through said first processing module is returned the base band frequency range in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader.
The 6th optimal technical scheme of the present invention is: second processing module of said a kind of receiver of ultra high frequency radio frequency identification reader is that the reception signal that returns the base band frequency range through the 3rd frequency converter down coversion is kept, and filtering is positioned at the 1/f noise and the DC component of intermediate frequency frequency range.
Of the present invention one more preferably technical scheme be: the frequency of the intermediate frequency local oscillator signal that second frequency converter adopts in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader at 1M between the 70MHz.
Of the present invention another more preferably technical scheme be: three frequency converters of the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader adopt frequency mixer or multiplier or chopper or modulator respectively.
Most preferred technique scheme of the present invention is: second frequency converter and the 3rd frequency converter all adopt chopper in the frequency-variable module of said a kind of receiver of ultra high frequency radio frequency identification reader.
Beneficial effect of the present invention: through read write line receiver of the present invention, baseband signal is upconverted to the intermediate frequency frequency range, carry out main signal Processing work in the intermediate frequency frequency range; Down coversion is returned the base band frequency range again, carries out signal filtering again, does not receive the influence of low frequency 1/f noise; Realized receiving separating of signal and low frequency 1/f noise and DC maladjustment; Reduced the receiver Effect on Performance, improved the recognition performance of read write line receiver, can effectively reduce receiver noise factor; Improve receiver sensitivity, guaranteed that the read write line receiver receives the accuracy of signal.
Description of drawings:
Direct down coversion (zero intermediate frequency) the read write line receiver agent structure schematic diagram that Fig. 1 is traditional;
Fig. 2 read write line receiver of the present invention main structure chart;
Fig. 3 read write line receiver of the present invention reduces the principle schematic of low frequency 1/f noise and DC maladjustment influence;
The concrete structure synoptic diagram of Fig. 4 read write line receiver of the present invention;
The FB(flow block) of Fig. 5 read write line receiver of the present invention implementation step;
The concrete structure synoptic diagram of Fig. 6 read write line receiver of the present invention dual signal passage.
Embodiment:
As shown in Figure 2, the signal path of a kind of receiver of ultra high frequency radio frequency identification reader of the present invention comprises: the frequency-variable module in frequency-variable module and the signal processing module, signal path comprises three frequency converters, and signal processing module comprises two processing modules.First frequency converter 1 in the frequency-variable module is connected with second frequency converter 2, and first processing module, 4, the three frequency converters 3 between second frequency converter 2 and the 3rd frequency converter 3 in the connection signal processing module connect second processing module 5 of signal processing module again.Adopt the DC component in the AC coupling filtering frequency variation signal between first frequency converter 1 and second frequency converter 2.
The concrete structure of a signal path of read write line receiver of the present invention is as shown in Figure 4, and workflow is as shown in Figure 5, and its concrete job step is following:
1) radiofrequency signal received of the application's receiver of ultra high frequency radio frequency identification reader at first through first frequency converter 1 of frequency-variable module, is direct down-conversion-to the base band frequency range after the local oscillation signal mixing identical with radiofrequency signal with oscillation frequency.First frequency converter 1 can be various device or modules with frequency transform function, has adopted frequency mixer in this example.
2) the reception signal that is down-converted to baseband frequency through first frequency converter 1 upconverts to the intermediate frequency frequency range after the local oscillation signal mixing through second frequency converter 2 and IF-FRE again.IF-FRE can be set up on their own by the frequency decision of local oscillation signal as required.To between the 70MHz, second frequency converter 2 adopts chopper to realize to the intermediate frequency local oscillator signal frequency of present embodiment at 1MHz.
3) the frequent hereinto section of reception signal that is up-converted to the intermediate frequency frequency range is carried out signal Processing such as signal amplification, filtering through first processing module 4 of signal processing module.In this example, first processing module 4 comprises variable gain amplifier and wave filter.
4) through 4 amplifications of first processing module and warp the 3rd frequency converter 3 and the mixing once more of intermediate frequency frequency range local oscillation signal again of filtered reception signal, down coversion is got back to the base band frequency range.The 3rd frequency converter 3 here also adopts chopper to realize.
5) down coversion return the base band frequency range the reception signal after second processing module 5 of signal processing module is amplified, Filtering Processing, filtering is positioned at the 1/f noise and the DC component of intermediate frequency frequency range, keeps the useful reception signal be positioned at the base band frequency range.
The principle of work of read write line receiver of the present invention is following:
As shown in Figure 3, the radiofrequency signal that the read write line receiver receives is positioned at IF-FRE after first frequency converter 1 and 2 frequency conversions of second frequency converter, see shown in the Vb among Fig. 3.The DC maladjustment component that the 1/f noise and first processing module 4 produce is represented that by the Vn among Fig. 3 the frequency spectrum after Vn and the Vb stack is shown in Vc.Vc exports signal Vd after signal Processing such as 4 amplifications of first processing module, filtering.Useful reception signal among the Vd is down converted to the base band frequency range once more through the 3rd frequency converter 3, and the 1/f noise and the DC maladjustment component that are positioned at low frequency then are up-converted to the intermediate frequency frequency range, shown in the Ve among Fig. 3.Be positioned at the 1/f noise and the DC component of intermediate frequency frequency range at last through 5 filterings of second processing module, keep the useful reception signal that is positioned at the base band frequency range, shown in the Vout among Fig. 3.Realized the separating of low frequency 1/f noise and DC maladjustment component and useful acknowledge(ment) signal reduced low-frequency noise to the receiver Effect on Performance through read write line receiver of the present invention, effectively raised the sensitivity and the reading performance of receiver.
As shown in Figure 6, when first frequency converter 1 of the frequency-variable module of read write line receiver of the present invention adopted orthogonal mixer, the read write line receiver had two signal paths, and every signal paths is provided with identical with the frequency-variable module and the processing module of mono signal path.
Read write line receiver of the present invention is through upconvert to the intermediate frequency frequency range with baseband signal once more; Carry out signal Processing in the intermediate frequency frequency range; Down coversion is returned the base band frequency range again, has realized receiving separating of signal and low frequency 1/f noise and DC maladjustment, has effectively reduced receiver noise factor; Improve receiving sensitivity, thereby improved RF identification receiver reading performance.
Should be noted that at last; Above embodiment is only in order to technical scheme of the present invention to be described but not it is limited; Although the present invention is specified with reference to the foregoing description; Said art is to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement, and do not break away from all should being encompassed in of the spirit and scope of the invention claim protection domain of the present invention.
Claims (4)
1. receiver of ultra high frequency radio frequency identification reader; Comprise frequency-variable module and signal processing module in the signal path of this receiver; It is characterized in that: the said frequency-variable module in the signal paths comprises three frequency converters, and said signal processing module comprises two processing modules; First frequency converter (1) in the said frequency-variable module is connected with second frequency converter (2); Connect first processing module (4) in the said signal processing module between said second frequency converter (2) and the 3rd frequency converter (3); Said the 3rd frequency converter (3) connects second processing module (5) of said signal processing module again, adopts the DC component in the AC coupling filtering frequency variation signal between said first frequency converter (1) and second frequency converter (2);
First frequency converter (1) is that local oscillation signal with radiofrequency signal that receives and same frequency carries out mixing in the said frequency-variable module, directly the radio frequency signal frequency that receives is down-converted to the base band frequency range by radio frequency band;
Second frequency converter (2) is with being converted to the reception signal of base band frequency range and the local oscillation signal of IF-FRE carries out mixing through first frequency converter in the said frequency-variable module, and the reception signal of base band frequency range is upconverted to the intermediate frequency frequency range;
First processing module (4) of said signal processing module is that amplification, filtering signal that the reception signal that upconverts to the intermediate frequency frequency range through second frequency converter (2) carries out are handled;
The 3rd frequency converter (3) is that the reception signal down coversion after handling through said first processing module (4) is returned the base band frequency range in the said frequency-variable module;
Said second processing module (5) is that the reception signal that returns the base band frequency range through the 3rd frequency converter (3) down coversion is kept, and filtering is positioned at the 1/f noise and the DC component of intermediate frequency frequency range.
2. a kind of receiver of ultra high frequency radio frequency identification reader as claimed in claim 1 is characterized in that: the frequency of the intermediate frequency local oscillator signal that second frequency converter (2) adopts in the said frequency-variable module at 1M between the 70MHz.
3. a kind of receiver of ultra high frequency radio frequency identification reader as claimed in claim 1 is characterized in that: three frequency converters of said frequency-variable module adopt frequency mixer or multiplier or chopper or modulator respectively.
4. a kind of receiver of ultra high frequency radio frequency identification reader as claimed in claim 1 is characterized in that: second frequency converter (2) and the 3rd frequency converter (3) all adopt chopper in the said frequency-variable module.
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| CN2009102232197A CN101706880B (en) | 2009-11-20 | 2009-11-20 | Receiver of ultra high frequency radio frequency identification reader |
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| CN2009102232197A CN101706880B (en) | 2009-11-20 | 2009-11-20 | Receiver of ultra high frequency radio frequency identification reader |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815487A (en) * | 2006-03-02 | 2006-08-09 | 浙江大学 | Superhigh frequency rediofrequency identical label reader |
| CN2904118Y (en) * | 2006-02-16 | 2007-05-23 | 深圳市先施科技有限公司 | High-speed remote-passive RF tag reader-writer |
| CN101388082A (en) * | 2007-09-10 | 2009-03-18 | 广东科学技术职业学院 | Super high frequency electronic label recognizer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904118Y (en) * | 2006-02-16 | 2007-05-23 | 深圳市先施科技有限公司 | High-speed remote-passive RF tag reader-writer |
| CN1815487A (en) * | 2006-03-02 | 2006-08-09 | 浙江大学 | Superhigh frequency rediofrequency identical label reader |
| CN101388082A (en) * | 2007-09-10 | 2009-03-18 | 广东科学技术职业学院 | Super high frequency electronic label recognizer |
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Application publication date: 20100512 Assignee: Core technology (Beijing) Electronic Technology Co., Ltd. Assignor: Guan Chao Contract record no.: 2013990000086 Denomination of invention: Receiver of ultra high frequency radio frequency identification reader Granted publication date: 20120425 License type: Exclusive License Record date: 20130314 |
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