Power supply processing interface in passive radio frequency identification system
A technology of power processing and radio frequency identification, applied in the direction of electromagnetic radiation induction, etc., can solve the problem of weakening the induction modulation distance
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[0040] The design purpose of the present invention is to provide a stable working power supply at the tag end of the passive RFID during the AM data modulation and demodulation process of the passive RFID. In the conventional system architecture as shown in FIG. 4, the original voltage limiter 24 The overvoltage detection function and the voltage limiting function of the system are separated. The position of the overvoltage detecting elements R241 and R242 still maintains the detection of the voltage of VDDA, but the voltage limiting element M243 is moved before the bridge rectifier circuit 22, and the detection bridge The voltage change of the output VDDA of the rectification circuit 22 can directly control the peak voltages of HF and HF1 on the LC resonant circuit 21 to form an effective closed-loop device.
[0041] Please refer to FIG. 5 , which is a system architecture diagram of a passive RFID tag according to a preferred embodiment of the present invention. As shown in F...
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