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
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[0021] The present invention will be further explained below in conjunction with the drawings:
[0022] Such as figure 1 As shown in the figure, the self-feedback circuit of the low-frequency half-duplex passive radio frequency card mainly includes: voltage comparator, LDO linear regulator, digital control circuit, D flip-flop and CLK clock.
[0023] The voltage comparator includes an active resistor, which is composed of a total of 10 PMOS tubes P0 to P9 connected in series with a diode connection, and then connected in series with a MOS tube. The gates of the 10 PMOS transistors are connected in series with the MOS transistors and grounded, and the MOS transistors are connected in a diode manner. PMOS transistors PA and PB and MOS transistors M1 and M2 are connected to form a current comparator. 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 then connected in parallel with the a...
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