A Half Duplex RFID Oscillation Sustaining Circuit Generated Pulse by Comparator
A technology for maintaining circuits and generating circuits, which is applied in the direction of differential amplifiers to generate pulses, electric pulses, and electric pulse generator circuits. to achieve the effects of high efficiency, improved response distance, and low power consumption
Active Publication Date: 2019-01-22
EXCELIO TECH SHENZHEN
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[0014] However, the third technical solution above does not propose a method for implementing a pulse width control circuit. In addition, the frequency of the circuit design PLL stabilization control signal will inevitably increase the power consumption of the system circuit, which will instead reduce the overall efficiency of the tag chip.
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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0037] Such as image 3 As shown in the present invention, a half-duplex RFID oscillation maintenance circuit that generates pulses through a comparator includes a resonant inductance and a resonant capacitor connected in parallel between the first antenna end and the second antenna end, the resonant inductance and the resonant capacitor The resonant capacitor forms a resonant circuit to couple the external magnetic field to generate AC current, and input the AC cu...
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The invention involves the semi -dual -worker RFID field. The invention generates the same frequency of the same frequency as the RF signal to generate the same frequency of the RF signal through the sampling of the RF signal and the control pulse generated circuit.That is, the change of the current injection is the same as the RF signal oscillation. Therefore, the oscillation frequency of the key resonance circuit in the present invention is not affected by the current injection, thereby ensuring the communication performance of the radio frequency recognition application intermediate frequency transfer key control;The invention uses two comparators to compare the output pulse signals from two reference potentials. According to the actual work needs of the circuit, adjust the reference potential to achieve the adjustment time point and current injection time length to achieve the highest current injection of the current injectionEfficiency, the circuit structure is simple, and the power consumption is low, which effectively improves the response distance of the half -worker RFID tag chip.
Description
technical field [0001] The invention belongs to the field of passive radio frequency identification (Radio Frequency Identification, RFID), and more specifically refers to a half-duplex RFID oscillation sustaining circuit that generates pulses through a comparator, and a half-duplex passive half-duplex that includes the oscillation sustaining circuit. radio frequency tags. Background technique [0002] Half-duplex (Half-duplex, HDX) radio frequency communication is a communication method for radio frequency identification passive tag chips. During the communication process, the information can be transmitted from the RFID card reader to the tag chip, also known as downlink transmission (downlink), or transmitted from the chip to the card reader, also known as uplink transmission (uplink). The transmission mode in which the uplink and downlink transmissions are not carried out at the same time is called "half-duplex transmission". In the downlink transmission mode, the wire...
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IPC IPC(8): G06K19/07
CPCG06K19/0723H03K3/023H03K3/0233G06K19/0726
Inventor 张千文吴边韩富强
Owner EXCELIO TECH SHENZHEN