| 摘要 |
A wireless IC tag 1 is provided with a memory circuit 304 including a ROM 307 in which an identification number is written, and a pulse width detection circuit 305 having divided resistors 111, 112, 113 and a capacitor 305 for detecting a signal waveform from a reader. In order to prevent the increase in the number of process steps and photomasks, a resistance value of the pulse width detection circuit 305 is adjusted by an electron beam writing method while utilizing a step of writing an identification number unique to the wireless IC tag 1 into the ROM ( 307 ) of the memory circuit 304.
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