A demodulation circuit applied to passive UHF radio frequency identification tag chip
A technology of radio frequency identification tags and demodulation circuits, applied in the field of analog integrated circuits, can solve the problems of increasing chip area and power consumption, complex structure, high cost, etc., and achieve the effects of reducing chip area, improving sensitivity, and improving dynamic range
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] like figure 1As shown, the present invention includes an envelope detection circuit 1, a voltage limiting circuit 2, a low-pass filter circuit 3, a reference level generation and comparison output circuit 4 connected in series, and the envelope detection circuit 1 includes a first PMOS transistor 101 , the second PMOS transistor 102, the first NMOS transistor 103, the second NMOS transistor 104, the third NMOS transistor 105, the fourth NMOS transistor 106, the fifth NMOS transistor 107, the sixth NMOS transistor 108, the first capacitor 131, the second Capacitor 132, third capacitor 133, fourth capacitor 134, fifth capacitor 135, the sources of the first PMOS transistor 101 and the second PMOS transistor 102 are connected to high level, the grid of the first PMOS transistor 101 is connected to the second PMOS transistor 102 is connected to the ...
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