High-frequency passive RFID (Radio Frequency Identification) analog front end circuit
A technology of analog front-end circuit and generating circuit, which is applied in the field of radio frequency identification, can solve the problems of limited service life and high cost, and achieve the effect of low cost
Inactive Publication Date: 2011-08-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
The energy of passive RFID tags comes from the radio frequency energy emitted by the reader, without the need for a built-in power supply. It has the advantages of small size, light weight, low cost, and almost no limit on service life, but requires a higher power reader; active RFID The energy of the tag comes from its built-in power supply, which has the advantages of long-distance identification and little dependence on the transmission power of the reader, but the cost is high and the service life is limited.
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[0017] Such as figure 1 As shown, a high-frequency passive RFID analog front-end circuit 100 disclosed in the present invention includes a demodulation circuit 101, a protection circuit 102, a reset circuit 103, a rectification circuit 105, a power generation circuit 104, a modulation circuit 106, a clock circuit 107, Antenna interface 108,109.
[0018] The three input ends of the demodulation circuit 101 are connected to the power generating circuit 104 and the first and second antenna interfaces 108 and 109, one output end thereof is connected to the clock circuit 107, and the other output end is connected to the output port of the analog front-end circuit.
[0019] The protection circuit 102 is directly connected to the first and second antenna interfaces 108,109.
[0020] The input end of the reset circuit 103 is connected to the first and second antenna interfaces 108, 109 and the power generation circuit 104, and its output end is connected to the output port of the ana...
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The invention discloses a high-frequency passive RFID (Radio Frequency Identification) analog front end circuit which has the structure that a protective circuit and a rectifying circuit are both connected with an antenna interface to obtain energy, are stored in an inner big capacitor and output high voltage to a power generation circuit; the power generation circuit is connected to the rectifying circuit, the input voltage is integrated into an electrical level suitable for working in the circuit, and output is connected to a reset circuit, a demodulation circuit, a clock circuit and a modulation circuit to provide a power supply for the circuits; the demodulation circuit is connected to the antenna interface to demodulate a signal received on an antenna, and the signal is output; the clock circuit is connected to the antenna to restore a clock signal from the signals received from the antenna, and the clock signal is output; and the rest circuit is connected to the rectifying circuit and can reset when the circuit is powered on or powered off. In the high-frequency passive RFID analog front end circuit, after a receiving antenna and a resonant capacitor are accessed, signal transmission in the RFID system can be finished, and the analog front end circuit has the advantages of high reliability, low cost and the like.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification, specifically an analog front-end circuit, which is especially suitable for the development of radio frequency identification circuits and the application of radio frequency identification technology under high-frequency passive conditions. Background technique [0002] RFID (radio frequency identification) radio frequency identification technology has been paid more and more 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 ability to identify moving targets. [0003] RFID tags are mainly divided into two types: passive tags (Passive, or batteryless tags) and active tags (Active tags). The energy of passive RFID tags comes from the radio frequency energy emitted by the reader, without the need for a built-in power supply, and has the advantages of...
Claims
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Login to View More IPC IPC(8): G06K19/077G06K7/00
Inventor 刘冬生邹雪城李奉波童乔凌王巨智李大为
Owner HUAZHONG UNIV OF SCI & TECH