| 摘要 |
A semiconductor device is provided to perform normal operation even when receiving a high frequency signal possible to break a device. A rectifier circuit(100) generates a first voltage from a first signal inputted through an input port. A comparison circuit(102) compares the first voltage inputted from the rectifier circuit with a reference voltage, and outputs a second signal to a switch. A voltage generation circuit(103) generates a second voltage from the first signal inputted through the input port. The rectifier circuit includes a transistor having at least a control port. The voltage generation circuit inputs the second voltage to the control port when the switch is turned on according to the second signal.
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