High-frequency semi-active RFID (Radio Frequency Identification) analog front-end circuit
A radio frequency analog front-end, semi-active technology, applied in the field of radio frequency identification, can solve the problems of limited service life, high cost, not supporting integrated sensors, etc., to achieve low-cost effects
Inactive Publication Date: 2015-10-07
ANHUI RUIHONG MDT INFOTECH
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Problems solved by technology
The energy of the passive RFID tag comes from the radio frequency energy emitted by the reader. It does not need a built-in power supply. It has the advantages of small size, light weight, low cost, and almost no service life limit. The energy of the writer is limited and generally does not support the application of integrated sensors; the semi-active RFID tag itself carries a battery, and the tag chip supports the use of sensors; the active tag can realize the communication between tags, and the tag can actively emit electromagnetic waves. Source communication, support ad-hoc network function, but high cost, limited service life
Method used
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[0011] See figure 1 This specific implementation adopts the following technical solutions: a high-frequency semi-active RFID analog front-end circuit 100 includes a demodulation circuit 101, a protection circuit 102, a reset circuit 103, a power generation circuit 104, a rectifier / wake-up circuit 105, and a modulation circuit 106 , The clock circuit 107, the first antenna interface 108, the second antenna interface 109; the three input ends of the demodulation circuit 101 are respectively connected to the power generation circuit 104 and the first antenna interface 108, the second antenna interface 109, solution One output terminal of the modulation circuit 101 is connected to the clock circuit 107, and the other output terminal is connected to the analog front-end circuit output port a;
[0012] The two input ends of the protection circuit 102 are respectively connected to the first antenna interface 108 and the second antenna interface 109;
[0013] The input terminal of the rese...
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The invention discloses a high-frequency semi-active RFID (Radio Frequency Identification) analog front-end circuit. The structure of the analog front-end circuit is as follows: a protection circuit and a rectifying / wake-up circuit are both connected to an antenna interface. The analog front-end circuit acquires energy, stores the energy in a large internal capacitor, and outputs a high voltage to a power supply generating circuit. The power supply generating circuit is connected to the rectifying / wake-up circuit, converts the input voltage into electrical levels suitable for operation of internal circuits, and outputs the electrical levels to a reset circuit, a demodulation circuit, a clock circuit and a modulation circuit; the demodulation circuit is connected to the antenna interface, and has the functions of demodulating a signal received by an antenna and outputting the signal. The reset circuit is connected to the rectifying / wake-up circuit, and can perform resetting when powered on or off.
Description
Technical field: [0001] The invention relates to the technical field of radio frequency identification, in particular to a high frequency semi-active RFID radio frequency analog front end circuit. Background technique: [0002] RFID (radio frequency identification) radio frequency identification technology has received increasing attention in recent years. Compared with early identification technologies such as barcodes, radio frequency cards have the advantages of non-contact, long reading distance, and identification of moving targets. [0003] RFID tags are mainly divided into passive tags (Passive) or (batteryless tag), semi-active tags (Semi-active tag) and active tags (Active tag) three types. The energy of a passive RFID tag comes from the radio frequency energy emitted by the reader. It does not need a built-in power supply. It has the advantages of small size, light weight, low cost, and almost no life limit. However, it requires a larger power reader. The energy of ...
Claims
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Inventor 谢海亭
Owner ANHUI RUIHONG MDT INFOTECH