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An ultrahigh-frequency RF identification system, consisting of a fully integrated tag and a special reader, has been developed for short-range and harsh size requirement applications. The system is fabricated in the standard 0.18- $\mu\hbox{m} $ CMOS process. The whole tag chip with an antenna, an analog front end, a baseband, and memory takes up an area of 0.36 $\hbox{mm}^{2} $, which is smaller...
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