CN206282315U - A kind of UHF rfid interrogators receiver - Google Patents
A kind of UHF rfid interrogators receiver Download PDFInfo
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- CN206282315U CN206282315U CN201620926855.1U CN201620926855U CN206282315U CN 206282315 U CN206282315 U CN 206282315U CN 201620926855 U CN201620926855 U CN 201620926855U CN 206282315 U CN206282315 U CN 206282315U
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Abstract
The utility model is related to a kind of UHF rfid interrogators receiver, belongs to radio frequency transceiver technical field.Circuit, RF front-end circuit, direct current are eliminated including carrier leak eliminate circuit, signal behavior wave filter, programmable gain amplifier and Δ sigma adc, the carrier leak eliminates circuit and is connected with signal receiving front-end, RF front-end circuit is connected into again, the RF front-end circuit includes I roads frequency mixer and Q roads frequency mixer, the direct current eliminates circuit, signal rotation wave filter, programmable gain amplifier and Δ sigma adc to be had two-way and is sequentially connected respectively, and I roads frequency mixer and Q roads frequency mixer are connected into direct current all the way and eliminate circuit respectively.The utility model reduces the noise coefficient of receiver, improves the sensitivity of UHF rfid interrogator receivers, improves reading distance of the read write line to passive label.
Description
Technical field
The utility model is related to radio frequency transceiver technical field, more particularly to a kind of UHF rfid interrogators receiver.
Background technology
UHF is hyperfrequency, and frequency range is located at 300MHz ~ 3000MHz, for passive UHF rfid systems, read write line with
Communication between label is to realize in a half duplex manner.The carrier wave that read write line is modulated to label transmitting, positioned at read write line cog region
To read write line feedback information in the way of backscattering, read write line is communicated interior label according to agreement regulation with label.Read
Write device and launch carrier wave simultaneously during passive label is read by electromagenetic wave radiation for passive label provides energy.
The passive distinctive tag backscatter mechanism of UHF rfid systems so that read write line receives the frequency of label modulated signal
Rate with transmitting frequency of carrier signal differ 50 ~ 250kHz, the shf band of 900MHz or so be difficult to use limited quality because
The plate upper filter of son filters carrier leakage signal.
In order to cost-effective, present read write line main trend is to use single antenna, by circulator, directional coupler etc. every
Sending and receiving isolation is carried out from device.Although less signal transmission power can reduce carrier leak, read write line can be also reduced
Tag read distance.
Utility model content
For the problem of shortcomings and deficiencies in the prior art, received the utility model proposes a kind of UHF rfid interrogators
Machine, reduces the noise coefficient of receiver, improves the sensitivity of UHF rfid interrogator receivers, improves read write line to nothing
The reading distance of source label.
The utility model solves the technical scheme that its technical problem used：
A kind of UHF rfid interrogators receiver, including carrier leak eliminates circuit, RF front-end circuit, direct current and eliminates electricity
Road, signal behavior wave filter, programmable gain amplifier and delta-sigma adc, the carrier leak eliminate circuit with letter
Number receiving front-end is connected, then is connected into RF front-end circuit, and the RF front-end circuit includes I roads frequency mixer and Q roads frequency mixer, institute
State direct current eliminate circuit, signal rotation wave filter, programmable gain amplifier and delta-sigma adc have respectively two-way and according to
Secondary to be connected, I roads frequency mixer and Q roads frequency mixer are connected into direct current all the way and eliminate circuit respectively.
Further, the signal receiving front-end includes circulator and directional coupler.
The utility model has the advantages that：The utility model on the one hand eliminate carrier leakage signal introducing compared with
Big direct current offset；On the other hand requirement of the carrier leakage signal higher to receiving front-end high linearity is greatly reduced, so as to subtract
Small receiver noise factor, improves the sensitivity of UHF RFID read write line chip receivers, improves read write line to passive mark
The reading distance of label.
Brief description of the drawings
Fig. 1 is the utility model circuit diagram.
Specific embodiment
With reference to specific embodiment, the utility model is expanded on further.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation scope of the present utility model.In addition, it is to be understood that reading the content of the utility model instruction
Afterwards, those skilled in the art can make various changes or modifications to the utility model, and these equivalent form of values equally fall within this Shen
Please appended claims limited range.
As illustrated, a kind of UHF rfid interrogators receiver, including carrier leak eliminate circuit, RF front-end circuit,
Direct current eliminates circuit, signal behavior wave filter, programmable gain amplifier and delta-sigma adc, and the carrier leak disappears
Except circuit is connected with signal receiving front-end, then RF front-end circuit is connected into, the RF front-end circuit includes I roads frequency mixer and Q
Road frequency mixer, the direct current eliminates circuit, signal rotation wave filter, programmable gain amplifier and delta-sigma adc point
There is not two-way and be sequentially connected, I roads frequency mixer and Q roads frequency mixer are connected into direct current all the way and eliminate circuit respectively.
Further, the signal receiving front-end includes circulator and directional coupler.
Specifically, carrier leak eliminates the larger carrier leakage signal of circuit SJC removal receiving front-ends, there is provided down-conversion mixer
The LO signals associated with carrier leakage signal, the label signal that RF front-end circuit will be received downconverts to base band, respectively by I
Road frequency mixer and Q roads frequency mixer are exported, and circuit DCOC removal direct current offsets are eliminated through direct current, then by signal behavior wave filter
CSF selects useful signal, then amplifies through programmable gain amplifier PGA, finally by delta-sigma adc output to rear class
Processed in digital circuit.
On the one hand the utility model eliminates the larger direct current offset of carrier leakage signal introducing；On the other hand substantially reduce
Requirement of the carrier leakage signal higher to receiving front-end high linearity, reduces receiver noise factor, improves UHF
The sensitivity of RFID read write line receivers.In equal read write line transmission power and passive label sensitivity, read write line pair is lifted
The reading distance of passive label, has great importance to improving UHF rfid systems communication reliability aspect.
Claims (2)
1. a kind of UHF rfid interrogators receiver, it is characterised in that：Including carrier leak eliminate circuit, RF front-end circuit,
Direct current eliminates circuit, signal behavior wave filter, programmable gain amplifier and delta-sigma adc, and the carrier leak disappears
Except circuit is connected with signal receiving front-end, then RF front-end circuit is connected into, the RF front-end circuit includes I roads frequency mixer and Q
Road frequency mixer, the direct current eliminates circuit, signal rotation wave filter, programmable gain amplifier and delta-sigma adc point
There is not two-way and be sequentially connected, I roads frequency mixer and Q roads frequency mixer are connected into direct current all the way and eliminate circuit respectively.
2. a kind of UHF rfid interrogators receiver according to claim 1, it is characterised in that：The signal receiving front-end
Including circulator and directional coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620926855.1U CN206282315U (en) | 2016-08-23 | 2016-08-23 | A kind of UHF rfid interrogators receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620926855.1U CN206282315U (en) | 2016-08-23 | 2016-08-23 | A kind of UHF rfid interrogators receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206282315U true CN206282315U (en) | 2017-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620926855.1U Active CN206282315U (en) | 2016-08-23 | 2016-08-23 | A kind of UHF rfid interrogators receiver |
Country Status (1)
| Country | Link |
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| CN (1) | CN206282315U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339732A (en) * | 2016-08-23 | 2017-01-18 | 池州睿成微电子有限公司 | UHF RFID reader-writer receiver |
-
2016
- 2016-08-23 CN CN201620926855.1U patent/CN206282315U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339732A (en) * | 2016-08-23 | 2017-01-18 | 池州睿成微电子有限公司 | UHF RFID reader-writer receiver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A UHF RFID reader and writer receiver Effective date of registration: 20231228 Granted publication date: 20170627 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chizhou branch Pledgor: CHIZHOU RICHSEMI ELECTRONICS CO.,LTD. Registration number: Y2023980074541 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |