To provide a tire monitoring wireless circuit and a tire monitoring system capable of improving the reliability of communication as compared with conventional ones.
In the tire monitoring wireless circuit 53, a resistance dumping circuit 62 having a switch element 63 and a resistor 64 is connected to an antenna resonance circuit 60, and when a modulation circuit 54 is switched from an excited state to a non-excited state, the resistance dumping circuit 62 is turned to an operating state and a resonance current of attenuating oscillation in the antenna resonance circuit 60 is allowed to flow into the resistor 64. Then, the resistor 64 is acted as a dumper and the settling time of the attenuating oscillation is shortened. Consequently the receiving side can accurately detect a digital base band signal from a carrier and the reliability of communication can be improved as compared with a conventional system.
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