CN202331539U - High-frequency passive RFID (Radio Frequency Identification) analog front end circuit - Google Patents

High-frequency passive RFID (Radio Frequency Identification) analog front end circuit Download PDF

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Publication number
CN202331539U
CN202331539U CN201120461512XU CN201120461512U CN202331539U CN 202331539 U CN202331539 U CN 202331539U CN 201120461512X U CN201120461512X U CN 201120461512XU CN 201120461512 U CN201120461512 U CN 201120461512U CN 202331539 U CN202331539 U CN 202331539U
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CN
China
Prior art keywords
circuit
analog front
clock
power generation
output terminal
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Expired - Fee Related
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CN201120461512XU
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Chinese (zh)
Inventor
刘冬生
邹雪城
李奉波
童乔凌
王巨智
李大为
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Priority to CN201120461512XU priority Critical patent/CN202331539U/en
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Publication of CN202331539U publication Critical patent/CN202331539U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a high-frequency passive RFID (Radio Frequency Identification) analog front end circuit, which is structurally characterized in that: a protection circuit and a rectifying circuit are connected with an antenna interface; obtained energy is stored in a large capacitor which is arranged inside the circuit, and a high voltage is output to a power supply generating circuit; the power supply generating circuit is connected with the rectifying circuit and integrates the input voltages to an electric level which is suitable for inner work of the circuit; an output is connected to a resetting circuit, a demodulating circuit, a clock circuit and a modulating circuit, so as to provide a power supply for the circuits; the demodulating circuit is connected to the antenna interface and is used for demodulating signals received from an antenna and outputting the signals; the clock circuit is connected to the antenna and is used for recovering the signals received from the antenna to a clock and outputting clock signals; and the resetting circuit is connected to the rectifying circuit and can be reset when the resetting circuit is powered on and powered off. According to the high-frequency passive RFID analog front end circuit disclosed by the utility model, the signal transmission of an RFID system can be finished through switching in a receiving antenna and a resonance capacitor; and the high-frequency passive RFID analog front end circuit has the advantages of high reliability, low cost and the like.

Description

A kind of high frequency passive RFID analog front circuit
Technical field
The utility model belongs to the REID field, is specially a analog front circuit, and the exploitation and the REID that are particularly useful for the rfid circuit under the high frequency passive condition are used.
Background technology
RFID (radio frequency identification) REID is more and more coming into one's own in recent years.Recognition technologies such as bar code with early stage are compared, and radio-frequency card has noncontact, reads distance, can discern advantages such as moving target.
The RFID label mainly is divided into two types of passive label (Passive, perhaps batteryless tag) and active labels (Active tag).The energy of passive RFID tags is from the RF energy of read write line emission, need not built-in power, and have that volume is little, in light weight, cost is low, almost do not have advantage such as restriction in serviceable life, but the more powerful read write line of needs; The energy of active RFID tag is from its built-in power, have long distance identification, the emissive power of read write line is relied on advantages such as little, but cost is high, serviceable life is limited.What account for main factor in the cost of rfid system is a large amount of RFID labels that use, and the RFID market RFID label that significantly growth needs is cheap promotes just might accomplish, and passive RFID tags and systems technology are following RFID main flow development trends.
In passive RFID system, the work that AFE(analog front end) need be accomplished has two kinds.The one, build the communication bridge of card reader and RFID label, that is to say that AFE(analog front end) receives the simulating signal that card reader is sent, through handling, obtain original digital signal, the digital baseband that offers the RFID label is handled; Simultaneously, AFE(analog front end) is accepted the signal that digital baseband need return to card reader, through handling, can identification mode send with card reader.Thereby assist to accomplish the communication between card reader and the RFID label.In passive RFID system, another effect of AFE(analog front end) is that the work for the RFID label chip provides energy, and AFE(analog front end) obtains energy from the carrier wave of card reader, through suitable conversion, for the RFID tag system provides stable WV.
Summary of the invention
The utility model provides a kind of high frequency passive RFID analog front circuit, and it can be good at realizing the communication between the card reader and RFID label in the rfid system, the most enough energy and stable voltage is provided for simultaneously the RFID label.
A kind of high frequency passive RFID analog front circuit that the utility model provides; It is characterized in that this analog front circuit comprises demodulator circuit, holding circuit, reset circuit, rectification circuit, power generation circuit, modulation circuit, clock circuit and first, second antennal interface;
Three input ends of demodulator circuit are connected respectively to power generation circuit and first, second antennal interface, and its output terminal is connected to clock circuit, and another output terminal is connected to the analog front circuit output port;
Holding circuit is directly connected to first, second antennal interface;
The input end of reset circuit is connected to first, second antennal interface and power generation circuit, and its output terminal is connected to the analog front circuit output port;
The input end of rectification circuit is connected to first, second antennal interface, and its output is connected to power generation circuit;
The input end of power generation circuit is connected to rectification circuit, and its first output terminal VDD is connected to demodulator circuit, reset circuit, modulation circuit and clock circuit, and the first output terminal VDD is also connected to the analog front circuit output port simultaneously; The second output terminal VCC of power generation circuit is connected to the analog front circuit output port;
The input end of modulation circuit is connected to power generation circuit and external modulation data-in port, and its output terminal is connected to first, second antennal interface;
The input end of clock circuit is connected to power generation circuit, first, second antennal interface and modulation circuit, and its output port is connected to the chip output mouth.
The beneficial effect of the utility model is through increasing the outer receiving antenna resonant electric capacity of sheet, can accomplish communicating by letter of card reader and RFID label.Simultaneously, it can also be integrated on the chips with digital baseband circuit and memory circuit, produces the RFID label with extremely low cost.
Description of drawings
Fig. 1 is a kind of high frequency passive RFID analog front circuit.
Fig. 2 is the RFID label that has antenna and digital baseband and EEPROM.
Embodiment
As shown in Figure 1, a kind of high frequency passive RFID analog front circuit 100 disclosed in the utility model comprises demodulator circuit 101, holding circuit 102, reset circuit 103, rectification circuit 105, power generation circuit 104, modulation circuit 106, clock circuit 107, antennal interface 108,109.
Three input ends of demodulator circuit 101 are connected to power generation circuit 104 and first, second antennal interface 108,109, and its output terminal is connected to clock circuit 107, and another output terminal is connected to the analog front circuit output port.
Holding circuit 102 is directly connected to first, second antennal interface 108,109.
The input end of reset circuit 103 is connected to first, second antennal interface 108,109 and power generation circuit 104, and its output terminal is connected to the analog front circuit output port.
The input end of rectification circuit 105 is connected to first, second antennal interface 108,109, and its output is connected to power generation circuit 104.
Power generation circuit 104 input ends are connected to rectification circuit 105, and its output terminal VDD is connected to demodulator circuit 101, reset circuit 103, modulation circuit 106 and clock circuit 107, and output terminal VDD is also connected to the analog front circuit output port simultaneously; Another output terminal VCC is connected to the analog front circuit output port.
The input end of modulation circuit 106 is connected to power generation circuit 104 and external modulation data-in port, and its output terminal is connected to first, second antennal interface 108,109.
The input end of clock circuit 107 is connected to power generation circuit 104, antennal interface 108,109 and modulation circuit 106, and its output port is connected to the chip output mouth.
Holding circuit 102 is judged the working condition of circuit this moment through the signal intensity of induction input port; When the intensity of signal is too high; Holding circuit 102 is through strengthening the mode of circuit load, makes the signal strength weakening of input port to play the effect of holding circuit 102; When signal intensity was more weak, holding circuit 102 changed low-power mode over to, and this moment, it did not cut any ice to circuit.
Rectification circuit 105 receives the ac supply signal of input port, is the direct current signal that has certain ripple through rectification circuit 105 with the AC signal rectification, this direct current signal input power generation circuit 104.The level of this direct current signal and the signal intensity of input port are directly proportional; In order to satisfy the supply stage of the noenergy under the 100% modulating mode condition in the high frequency agreement, we have also adopted an electric capacity to play energy storage simultaneously.
The signal that rectification circuit 105 rectifications go out can't directly be supplied power to other part in the RFID label, and for this reason, we have adopted power generation circuit 104 that it is carried out step-down, voltage stabilizing processing, draw a direct supply.This power supply is that subsequent conditioning circuit provides energy, is that to satisfy subsequent conditioning circuit technology desired, the DC level of ripple factor within 10%.Simultaneously, when this power supply can also change suddenly in the load of analog front circuit, reaction rapidly, it is stable that holding circuit is exported.
Demodulator circuit 101 receives the signal of input port, handles through getting envelope, amplification, comparison and shaping, obtain with carrier wave in the consistent restituted signal of signal, this signal is connected to the output port of analog front circuit.Simultaneously, under 100% modulating mode, this circuit also can detect 100% modulation signal in the high frequency agreement, and this signal input clock circuit 107 produces erroneous clock signal in order to prevent clock circuit 107.
The effect of clock circuit 107 is for the RFID label clock consistent with card reader inside to be provided.The utility model recovers the clock of card reader from carrier signal, consistent with the card reader clock in order to the clock that guarantees the RFID label.
All produce reset signal when reset circuit 103 powers in system and during power down.It provides time enough and returns to original state by analog front circuit and with various settings that analog front circuit constitutes the circuit of RFID label chip together.
As shown in Figure 2, a kind of high frequency passive RFID analog front circuit 100 disclosed in the utility model is through an external inductance L T110, one resonant capacitance C111, a digital baseband 121 and an EEPROM memory circuit 122 are just formed a complete RFID label.
Card reader is sent one to label and is sought order, and high-frequency RF ID label is through inductance L T110 sense signal, produce resonance through resonant capacitance 111, obtain the signal that a signal intensity is strengthened, the input port 108 and 109 of input chip.After chip is handled this signal; Export following signal to the chip output mouth: the VCC power supply is supplied with EEPROM memory circuit 122; The VDD power supply is supplied with digital baseband 121; Clock signal is supplied with digital baseband 121 and EEPROM memory circuit 122, and demodulating data is supplied with digital baseband 121, and reset signal is supplied with digital baseband 121 and EEPROM memory circuit 122; Receive the modulated data signal that digital baseband 121 returns simultaneously.
After digital baseband 121 receives reset signals, the various registers of inside are resetted, and the state of control EEPROM.Digital baseband is ready to receive order then, after it receives restituted signal, signal is decoded and is discerned, and judges to be one and to seek instruction; Next step, it controls EEPROM, reads the RFID label that is stored among the EEPROM ID number, passes through the coding of protocol requirement then, passes back to AFE(analog front end).AFE(analog front end) is handled through corresponding, and antenna port 108 and 109 is gone up in its modulation, and signal is passed card reader back.Card reader is handled signal accordingly, has so just accomplished communicating by letter of card reader and RFID label.
The utility model not only is confined to above-mentioned embodiment; Persons skilled in the art are according to the disclosed content of the utility model; Can adopt other multiple embodiment to implement the utility model, therefore, project organization of every employing the utility model and thinking; Do some simple designs that change or change, all fall into the scope of the utility model protection.

Claims (1)

1. high frequency passive RFID analog front circuit; It is characterized in that this analog front circuit comprises demodulator circuit (101), holding circuit (102), reset circuit (103), rectification circuit (105), power generation circuit (104), modulation circuit (106), clock circuit (107) and first, second antennal interface (108,109);
Three input ends of demodulator circuit (101) are connected respectively to power generation circuit (104) and first, second antennal interface (108,109), and its output terminal is connected to clock circuit (107), and another output terminal is connected to the analog front circuit output port;
Holding circuit (102) is directly connected to first, second antennal interface (108,109);
The input end of reset circuit (103) is connected to first, second antennal interface (108,109) and power generation circuit (104), and its output terminal is connected to the analog front circuit output port;
The input end of rectification circuit (105) is connected to first, second antennal interface (108,109), and its output is connected to power generation circuit (104);
The input end of power generation circuit (104) is connected to rectification circuit (105); Its first output terminal VDD is connected to demodulator circuit (101), reset circuit (103), modulation circuit (106) and clock circuit (107), and the first output terminal VDD is also connected to the analog front circuit output port simultaneously; The second output terminal VCC of power generation circuit (104) is connected to the analog front circuit output port;
The input end of modulation circuit (106) is connected to power generation circuit (104) and external modulation data-in port, and its output terminal is connected to first, second antennal interface (108,109);
The input end of clock circuit (107) is connected to power generation circuit (104), first, second antennal interface (108,109) and modulation circuit (106), and its output port is connected to the chip output mouth.
CN201120461512XU 2011-11-18 2011-11-18 High-frequency passive RFID (Radio Frequency Identification) analog front end circuit Expired - Fee Related CN202331539U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201120461512XU CN202331539U (en) 2011-11-18 2011-11-18 High-frequency passive RFID (Radio Frequency Identification) analog front end circuit

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Application Number Priority Date Filing Date Title
CN201120461512XU CN202331539U (en) 2011-11-18 2011-11-18 High-frequency passive RFID (Radio Frequency Identification) analog front end circuit

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CN202331539U true CN202331539U (en) 2012-07-11

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104771140A (en) * 2015-03-13 2015-07-15 江苏物联网研究发展中心 RFID-based self-powered intelligent sensor
WO2015103959A1 (en) * 2014-01-08 2015-07-16 卓捷创芯科技(深圳)有限公司 Intelligent energy management system and energy management method for passive radio-frequency tag
CN104866791A (en) * 2015-06-12 2015-08-26 安徽朗坤物联网有限公司 High-frequency semi-active RFID (Radio Frequency Identification) radiofrequency analog front-end circuit
CN104966036A (en) * 2015-07-08 2015-10-07 安徽瑞宏信息科技有限公司 High-frequency semi-active RFID (Radio Frequency Identification) analog front-end circuit
CN105022975A (en) * 2014-04-24 2015-11-04 合肥博焱智能科技有限公司 High-frequency semi-active RFID radio frequency analog front-end circuit
CN106330423A (en) * 2016-08-31 2017-01-11 北海市蕴芯电子科技有限公司 RFID clock extraction circuit with low power consumption
CN108418590A (en) * 2018-02-08 2018-08-17 北京瑞芯谷科技有限公司 radio frequency transmission chip

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015103959A1 (en) * 2014-01-08 2015-07-16 卓捷创芯科技(深圳)有限公司 Intelligent energy management system and energy management method for passive radio-frequency tag
CN105022975A (en) * 2014-04-24 2015-11-04 合肥博焱智能科技有限公司 High-frequency semi-active RFID radio frequency analog front-end circuit
CN104771140A (en) * 2015-03-13 2015-07-15 江苏物联网研究发展中心 RFID-based self-powered intelligent sensor
CN104866791A (en) * 2015-06-12 2015-08-26 安徽朗坤物联网有限公司 High-frequency semi-active RFID (Radio Frequency Identification) radiofrequency analog front-end circuit
CN104966036A (en) * 2015-07-08 2015-10-07 安徽瑞宏信息科技有限公司 High-frequency semi-active RFID (Radio Frequency Identification) analog front-end circuit
CN106330423A (en) * 2016-08-31 2017-01-11 北海市蕴芯电子科技有限公司 RFID clock extraction circuit with low power consumption
CN108418590A (en) * 2018-02-08 2018-08-17 北京瑞芯谷科技有限公司 radio frequency transmission chip
CN108418590B (en) * 2018-02-08 2022-07-19 北京瑞芯谷科技有限公司 Radio frequency transmission chip

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120711

Termination date: 20121118