| abstract |
The wireless tag includes a circuit which receives an AC signal from the outside and detects an envelope, a detection circuit which detects the level of electric power supplied from the outside and outputs a potential corresponding to the detected electric power, a protection circuit which changes an impedance of a circuit receiving the electric power in accordance with the electric power output from the detection circuit, a selection circuit portion which selects whether the electric power output from the detection circuit is input to the protection circuit. |