Load modulating module in radio-frequency identification (RFID)
A technology of load modulation and radio frequency identification, applied in the direction of amplitude-to-angle modulation conversion, inductive record carrier, instrument, etc., can solve the problem of waveform and load modulation depth variation, difficult demodulation of card reader, demodulation error of card reader, etc. problems, to achieve the effect of ensuring normal communication and enhancing compatibility
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[0012] figure 2 It is an embodiment of the present invention, the load modulation module in the radio frequency identification includes: a coupling circuit, a load modulation circuit connected to the output end of the coupling circuit, and a load modulation circuit connected to the output end of the load modulation circuit connected to a clipping circuit. In order to improve the load modulation waveform and load modulation depth under large field strength and enhance the compatibility of radio frequency identification cards, the load modulation circuit controls the NMOS transistors MN1 and MN2 in the load modulation circuit through a variable voltage under large field strength to enable load modulation.
[0013] The coupling circuit is composed of an inductor L1, an inductor L2 and a capacitor C1. Capacitor C1 is connected in parallel with both ends of inductor L2. The input signal IN is coupled to the radio frequency identification card terminal through the inductors L1 a...
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