CN203133921U - Radio frequency circuit of ultrahigh frequency electronic tag - Google Patents
Radio frequency circuit of ultrahigh frequency electronic tag Download PDFInfo
- Publication number
- CN203133921U CN203133921U CN 201320154739 CN201320154739U CN203133921U CN 203133921 U CN203133921 U CN 203133921U CN 201320154739 CN201320154739 CN 201320154739 CN 201320154739 U CN201320154739 U CN 201320154739U CN 203133921 U CN203133921 U CN 203133921U
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- circuit
- radio frequency
- electronic tag
- radio
- ultrahigh frequency
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Abstract
The utility model discloses a radio frequency circuit of an ultrahigh frequency electronic tag. The radio frequency circuit of the ultrahigh frequency electronic tag includes an impendence switching circuit and an envelope detection circuit. The impendence switching circuit is specifically a radio frequency dual-channel gating circuit. One channel of the radio frequency dual-channel gating circuit is connected with an impedance matched load while the other channel of the radio frequency dual-channel gating circuit is connected with the envelope detection circuit. The radio frequency dual-channel gating circuit realizes gate connection of the impedance matched load or the envelope detection circuit. The envelope detection circuit includes a detector and a comparator. The detector is connected with the radio frequency dual-channel gating circuit. The detector is used for detecting envelope analog signals in radio frequency signals. The comparator is used for converting the envelope analog signals to digital signals. According to the utility model, the radio frequency dual-channel gating circuit is adopted for realizing input impedance switch of the ultrahigh frequency electronic tag, and the logarithmic detector and the comparator are adopted for realizing the conversion of radio frequency receiving signals to base-band digital signals. The radio frequency circuit of the ultrahigh frequency electronic tag is simple in circuit structural form, low in integration degree and convenient for adjustment, and can be applied to scientific research, teaching and development and testing of communication protocols.
Description
Technical field
The utility model belongs to the REID field, is specifically related to a kind of ultrahigh frequency electronic tag radio circuit.
Background technology
Ultrahigh frequency electronic tag is a kind of passive passive communication apparatus, and it utilizes the antenna of ultrahigh frequency electronic tag to receive the radiofrequency signal that the ultrahigh frequency reader sends, and carries out the required power supply of electron gain label chip work after the rectification; Obtain the signal envelope of the modulation signal of ultrahigh frequency reader transmission simultaneously by envelope detection, handle the back and obtain the receiving cable baseband digital signal; It then is by switching the radio frequency input impedance of ultrahigh frequency electronic tag that the data of ultrahigh frequency electronic tag send, control the radiofrequency signal that comes from the ultrahigh frequency reader of ultrahigh frequency electronic tag reflection, make reflected signal present different variations at power or phase place, thereby realize amplitude modulation(PAM) or phase place modulation to the radio frequency reflected signal.
The actual ultrahigh frequency RFID electronic tag that uses is inactive component at present, and communication modes is half-duplex.Electronic tag mainly comprises electronic label chip and antenna two parts.Electronic label chip mainly comprises data-carrier store etc. on rectification circuit, impedance commutation circuit, clock generation circuit, baseband signal encoding and decoding and protocol processing unit and the sheet.The impedance commutation circuit of existing ultrahigh frequency electronic tag mainly adopts circuit such as the field effect transistor realization that is easy to be integrated into chip internal, the radio frequency detector diode is then often adopted in the detection of radiofrequency signal, the detecting circuit that resistance and electric capacity constitute is realized, so just make the integrated level of whole radio circuit very high, caused at research and teaching, the exploitation of communications protocol and be to test the signal of its inside in the exploitation of simulation electronic label of purpose with the test, will consider the design effort with the radio circuit of electronic label chip, this has increased work unnecessary in research and teaching undoubtedly, has also limited the exploitation of the air interface protocol relevant with electronic tag simultaneously.
The utility model content
Technical problem to be solved in the utility model provides that a kind of circuit structure form is simple, integrated level is low, and the ultrahigh frequency electronic tag radio circuit of being convenient to debug.
The technical scheme that its technical matters that solves the utility model adopts is: the ultrahigh frequency electronic tag radio circuit, comprise impedance commutation circuit and envelope detection circuit, described impedance commutation circuit is specially radio frequency two-way gating circuit, described radio frequency two-way gating circuit one tunnel connects matched-impedance load, another road connects envelope detection circuit, and described radio frequency two-way gating circuit gating connects matched-impedance load or envelope detection circuit; Described envelope detection circuit comprises wave detector and comparer, and wave detector is connected with radio frequency two-way gating circuit; Described wave detector is for detection of the envelope emulates signal that goes out radiofrequency signal; Described comparer is used for the envelope emulates signal is converted to digital signal.
Further, the input impedance of described envelope detection circuit is 50 ohm.
Further, described matched-impedance load adopts 0 ohm load.
Further, described wave detector adopts logarithmic detector.
Further, described logarithmic detector adopts the LT5534 logarithmic detector.
Further, described radio frequency two-way gating circuit adopts SW425 radio frequency two-way gating switch.
Further, described comparer adopts the AD8468 comparer.
The beneficial effects of the utility model: ultrahigh frequency electronic tag radio circuit of the present utility model is realized the input impedance switching of ultrahigh frequency electronic tag by adopting radio frequency two-way gating circuit, adopt logarithmic detector and comparer to realize that radio frequency receiving signal is to the conversion of baseband digital signal, its circuit structure form is simple, integrated level is low and be convenient to debugging, can be used for the development﹠ testing of research and teaching, communications protocol; Externally hardware interface is simple, only needs two digits signaling interface at least, and one as the receiving cable baseband digital signal, and one as the transmission channel baseband digital signal, for the design of base band encoding and decoding and agreement control circuit provides very big selection space.
Description of drawings
Fig. 1 is the structured flowchart of the ultrahigh frequency electronic tag radio circuit of the utility model embodiment;
Fig. 2 is the physical circuit connection layout of the ultrahigh frequency electronic tag radio circuit of the utility model embodiment;
Fig. 3 is the time domain test synoptic diagram of the output voltage of logarithmic detector of ultrahigh frequency electronic tag radio circuit of the utility model embodiment and comparer output voltage.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Be illustrated in figure 1 as the structured flowchart of the ultrahigh frequency electronic tag radio circuit of the utility model embodiment, specifically comprise impedance commutation circuit and envelope detection circuit, described impedance commutation circuit adopts radio frequency two-way gating circuit, described radio frequency two-way gating circuit one tunnel connects matched-impedance load, another road connects envelope detection circuit, and described radio frequency two-way gating circuit gating connects matched-impedance load or envelope detection circuit; Described envelope detection circuit comprises wave detector and comparer, and wave detector is connected with radio frequency two-way gating circuit; Described wave detector is for detection of the envelope emulates signal that goes out radiofrequency signal; Described comparer is used for the envelope emulates signal is converted to digital signal.
The concrete course of work is: after the radiofrequency signal that radio frequency two-way gating circuit receiving antenna end sends, be transferred to wave detector, detected the envelope emulates signal of radiofrequency signal by wave detector, pass to again in the comparer envelope emulates signal is converted to digital signal, described digital signal is baseband receiving signals, baseband control unit by the circuit periphery sends the base band control signal to radio frequency two-way gating circuit according to baseband receiving signals, connect matched-impedance load or envelope detection circuit by radio frequency two-way gating circuit gating, realize the modulation to reflected signal.By adopting radio frequency two-way gating circuit gating to connect matched-impedance load and envelope detection circuit, substituted field effect transistor of the prior art as the impedance switching device, reduced the integrated level of circuit board, discharged circuit board space, and adopt logarithmic detector and comparer combination, the conversion that realization is arrived baseband digital signal to radiofrequency signal at last to the envelope emulates signal, and send the base band control signal by the baseband control unit of circuit periphery and carry out the impedance switching to radio frequency two-way gating circuit, the modulation of the reflected signal of the radiofrequency signal received of achieving a butt joint, and adopt logarithmic detector and comparer can better adapt to the different radio frequency emissive power that the ultrahigh frequency reader sends, improve the scope of application, adopt ultrahigh frequency electronic tag radio circuit of the present utility model, can in the development﹠ testing of research and teaching and communications protocol, play good effect.
The impedance of described envelope detection circuit is 50 ohm, in the operation of reality, can select the envelope detection circuit of different input resistance according to different situations, described matched-impedance load is 0 ohm load, when radio frequency two-way gating circuit gating connected 0 ohm load, the radiofrequency signal that receives by antenna almost can all reflect; When radio frequency two-way gating circuit gating connects envelope detection circuit, have only minimum part radiofrequency signal to be reflected.The ultrahigh frequency reader changes by the radiofrequency signal power that detects ultrahigh frequency electronic tag and reflect and comes detection information, if matched-impedance load does not adopt 0 ohm load, during such as employing 20 Ohmages, the intensity of reflected signal will reduce, but only can influence the signal reception of ultrahigh frequency reader, and can not influence other functions, so in the situation of reality, can require to adjust the matched-impedance load of radio circuit according to concrete RF index, to adapt to different demands.
Be illustrated in figure 2 as the physical circuit connection layout of the ultrahigh frequency electronic tag radio circuit of the utility model embodiment, comprise SW425 radio frequency two-way gating switch 101, LT5534 logarithmic detector 102, AD8468 comparer 103, its concrete course of work is: radiofrequency signal is by the ultra-high frequency antenna splicing ear, behind a capacitance 106, enter radio frequency two-way gating switch, by transmission channel baseband digital signal D and its anti-phase digital signal
The switching of control radio frequency two-way gating switch, one tunnel radiofrequency signal is connected with build-out resistor 104 by capacitance 105, the reflection of radiofrequency signal was the strongest when wherein resistance 104 was 0 ohm, but also can require to be adjusted into other impedances according to RF index, another road radiofrequency signal enters logarithmic detector by capacitance 107, the equivalent radio frequency impedance of logarithmic detector is 50 ohm, and the radiofrequency signal reflection of this moment is minimum.The output terminal of logarithmic detector is connected to the positive input terminal of comparer by electric capacity 108 and resistance 109, is connected to the negative input end of comparer simultaneously by resistance 110, is parallel to ground by electric capacity 111 again.
The output voltage time domain test pattern of logarithmic detector as shown in Figure 3 and comparer, the comparer envelope emulates signal of logarithmic detector output the most at last converts digital baseband reception signal to, baseband control unit by the periphery sends the base band control signal to radio frequency two-way gating circuit according to baseband receiving signals, the modulation to the reflected signal of radiofrequency signal is finished in the input impedance of the radio circuit that radio frequency two-way gating circuit gating connects.
Claims (7)
1. ultrahigh frequency electronic tag radio circuit, comprise impedance commutation circuit and envelope detection circuit, it is characterized in that: described impedance commutation circuit is specially radio frequency two-way gating circuit, described radio frequency two-way gating circuit one tunnel connects matched-impedance load, another road connects envelope detection circuit, and described radio frequency two-way gating circuit gating connects matched-impedance load or envelope detection circuit; Described envelope detection circuit comprises wave detector and comparer, and wave detector is connected with radio frequency two-way gating circuit; Described wave detector is for detection of the envelope emulates signal that goes out radiofrequency signal; Described comparer is used for the envelope emulates signal is converted to digital signal.
2. ultrahigh frequency electronic tag radio circuit as claimed in claim 1, it is characterized in that: the input impedance of described envelope detection circuit is 50 ohm.
3. ultrahigh frequency electronic tag radio circuit as claimed in claim 1, it is characterized in that: described matched-impedance load adopts 0 ohm load.
4. as the described ultrahigh frequency electronic tag radio circuit of each claim of claim 1 to 3, it is characterized in that: described wave detector adopts logarithmic detector.
5. ultrahigh frequency electronic tag radio circuit as claimed in claim 4 is characterized in that: described logarithmic detector employing LT5534 logarithmic detector.
6. as the described ultrahigh frequency electronic tag radio circuit of each claim of claim 1 to 3, it is characterized in that: described radio frequency two-way gating circuit adopts SW425 radio frequency two-way gating switch.
7. as the described ultrahigh frequency electronic tag radio circuit of each claim of claim 1 to 3, it is characterized in that: described comparator circuit adopts the AD8468 comparer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154739 CN203133921U (en) | 2013-03-29 | 2013-03-29 | Radio frequency circuit of ultrahigh frequency electronic tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154739 CN203133921U (en) | 2013-03-29 | 2013-03-29 | Radio frequency circuit of ultrahigh frequency electronic tag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133921U true CN203133921U (en) | 2013-08-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320154739 Withdrawn - After Issue CN203133921U (en) | 2013-03-29 | 2013-03-29 | Radio frequency circuit of ultrahigh frequency electronic tag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203133921U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198350A (en) * | 2013-03-29 | 2013-07-10 | 成都九洲电子信息系统股份有限公司 | Ultrahigh frequency radio frequency identification radio-frequency circuit |
| CN106788513A (en) * | 2017-02-10 | 2017-05-31 | 安徽白鹭电子科技有限公司 | Binary channels self-identifying fixed ampllitude receiver |
| CN107704789A (en) * | 2017-09-26 | 2018-02-16 | 深圳市远望谷信息技术股份有限公司 | Make the method and device of electronic tag automatic switchover work between multiple agreements |
-
2013
- 2013-03-29 CN CN 201320154739 patent/CN203133921U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198350A (en) * | 2013-03-29 | 2013-07-10 | 成都九洲电子信息系统股份有限公司 | Ultrahigh frequency radio frequency identification radio-frequency circuit |
| CN103198350B (en) * | 2013-03-29 | 2016-04-13 | 成都九洲电子信息系统股份有限公司 | Ultrahigh frequency radio frequency identification radio-frequency circuit |
| CN106788513A (en) * | 2017-02-10 | 2017-05-31 | 安徽白鹭电子科技有限公司 | Binary channels self-identifying fixed ampllitude receiver |
| CN106788513B (en) * | 2017-02-10 | 2019-05-03 | 安徽白鹭电子科技有限公司 | Binary channels self-identifying fixed ampllitude receiver |
| CN107704789A (en) * | 2017-09-26 | 2018-02-16 | 深圳市远望谷信息技术股份有限公司 | Make the method and device of electronic tag automatic switchover work between multiple agreements |
| CN107704789B (en) * | 2017-09-26 | 2021-11-19 | 深圳市远望谷信息技术股份有限公司 | Method and device for automatically switching electronic tag among multiple protocols |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130814 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |