Limiting amplitude protection circuit used in non-contact IC card and radio frequency identification label
A technology of radio frequency identification tags and limiter protection, applied in the direction of electrical components, electronic switches, instruments, etc., can solve the problem of affecting the modulation signal envelope, affecting demodulation, voltage stabilization, and normal operation of reset circuits, and cannot affect clocks, resets, etc. To avoid problems such as the normal operation of the circuit, to avoid easy power off, weaken the discharge capacity, and enhance the effect of discharge capacity
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[0017] As shown in Figure 3, when the AC carrier signal sent by the reader to the space is coupled by the antenna end of the non-contact IC card or RFID tag and sent to the rectification and filtering circuit, the output signal is generated, that is, the DC envelope signal rec_out. The level of the envelope signal rec_out is directly related to the field strength of the non-contact IC card or radio frequency identification tag. The higher the field strength is, the higher the envelope signal rec_out is, and the lower the field strength is, the lower the envelope signal rec_out is. The envelope signal rec_out is used as the input of the high voltage and low voltage detection circuits.
[0018] When the envelope signal rec_out is higher than a certain value Vhigh (the input voltage when the high-voltage detection circuit generates an effective output), the output terminal of the high-voltage detection circuit outputs a low level vctrl1, and the PMOS transistor M1 as a charge cur...
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