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Electricity discharging self-feedback circuit of low-frequency half-duplex passive radio frequency card

A passive radio frequency, half-duplex technology, applied in the direction of record carriers, instruments, computer components, etc. used by machines, can solve the problems of large signal reading distance, long charging time, low execution voltage, etc., to speed up processing, Effect of power saving and low power consumption

Inactive Publication Date: 2015-04-29
BEIHAI YUNXIN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that it increases energy consumption, takes a long time to charge, and the execution voltage is too low, which makes it impossible to obtain a large signal reading distance.

Method used

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  • Electricity discharging self-feedback circuit of low-frequency half-duplex passive radio frequency card
  • Electricity discharging self-feedback circuit of low-frequency half-duplex passive radio frequency card

Examples

Experimental program
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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention will be further described:

[0022] Such as figure 1 As shown in , the self-feedback circuit of low-frequency half-duplex passive RF card mainly includes: voltage comparator, LDO linear regulator, digital control circuit, D flip-flop and CLK clock, etc.

[0023] The voltage comparator includes an active resistor, which consists of 10 PMOS transistors from P0 to P9 connected in series with a diode, and then connected in series with 1 MOS transistor. The gates of the 10 PMOS transistors are connected and connected in series with the MOS transistors and then grounded, and the MOS transistors are connected in a diode manner. A current comparator is formed by connecting PMOS transistors PA and PB to MOS transistors M1 and M2. The gates of PA and PB are connected to the Bias bias current, and the gate terminal of M2 is marked as the net1 terminal. The current comparator is connected in parallel with the a...

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PUM

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Abstract

The invention relates to an electricity discharging self-feedback circuit of a low-frequency half-duplex passive radio frequency card, and belongs to the technical field of radio frequency circuits. The electricity discharging self-feedback circuit of the low-frequency half-duplex passive radio frequency card is used for controlling the stored electric quantity of an electric storage capacitor in the low-frequency half-duplex passive radio frequency card. The electricity discharging self-feedback circuit comprises a voltage comparator and an electricity discharging MOS tube, wherein the voltage comparator is used for comparing the voltage of the two ends of the electric storage capacitor with a preset voltage and controlling a work starting signal and a reset signal to output; the electricity discharging MOS tube is used for carrying out the electricity discharging operation of the electric storage capacitor after carrying out data reading operation, while the preset voltage is maintained on the electric storage capacitor, and the preset voltage is not zero. Compared with the prior art, capacity charge begins from the preset voltage but not 0V when the electricity discharging self-feedback circuit disclosed by the invention carries out subsequent commands, so that the voltage-rise time is shortened, the power consumption is reduced, and the processing of the commands is accelerated.

Description

technical field [0001] The invention relates to a low-frequency half-duplex passive radio frequency card self-feedback circuit for discharging electricity, belonging to the technical field of radio frequency circuits. Background technique [0002] The application of radio frequency technology is more and more extensive, and the demand for a low-cost, high-security passive radio frequency card that can be used in harsh environments is also increasing. According to the data return mode, passive radio frequency cards are divided into full-duplex passive radio frequency cards and half-duplex passive radio frequency cards. The full-duplex passive radio frequency card means that when the card reader sends the carrier wave, the passive radio frequency card returns data to the card reader through ASK (Frequency-shift keying, frequency-shift keying) modulated carrier wave. Because it is necessary to receive the carrier wave and send data, the data signal is easily interfered. The h...

Claims

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Application Information

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IPC IPC(8): G06K19/077
Inventor 刘敬术潘明尤李盛龙廖强
Owner BEIHAI YUNXIN ELECTRONICS TECH
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