Demodulation circuit of non-contact IC card
A demodulation circuit, non-contact technology, applied in the field of non-contact IC card demodulation circuit, can solve the problems of low input signal VREF3, decoding error, affecting normal transmission of data bits, etc., to improve sensitivity, realize decoding, The effect of preventing decoding errors
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[0025] Such as image 3 Shown is the schematic diagram of the demodulation circuit of the non-contact IC card of the embodiment of the present invention; In the demodulation circuit of the non-contact IC card of the embodiment of the present invention, the carrier frequency of the transmission data from the card reader to the non-contact IC card is 13.56 MHZ, the data transmission rate is 848Kbits / s, and the transmission time Tbit of one data bit is 16clk. The demodulation circuit includes:
[0026] Comparator 6, the first input end of described comparator 6 is connected with first reference signal VREF1, and the second input end of described comparator 6 is connected with input signal VREF3, and this input signal VREF3 is described non-contact IC card from antenna namely image 3 The modulated signal emitted by the card reader received at the middle ant is a signal after detection and high-pass filtering; the output terminal of the comparator 6 outputs a demodulated signal D...
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