Abstract:A passive RFID tag with security and measurement concepts is presented. The sensor interface module has a resistance deviation-to-time interval converter. The passive RFID tag embedded with a converter is described. A prototype RFID tag using a converter has been built with CMOS 0.35um technology. The experimental results have shown that the tag has an 8 bits resolution and a linearity characteristic when the output pulse is counted by a 3.39 MHz clock. The proposed converter is insensitive to the pulse width change regardless of environment changes. The design principle and the circuit configuration are simple. The proposed converter is expected to find wide applications in the signal processing of various sensors. Key words – RFID tag, RFID application, security, sensor signal processor, converter, analog circuit. 1
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