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This paper presents a low power high sensitivity RF power detector (PD) for multi-mode active tags. To achieve low power consumption and large detection range, two-branch common-source-type MOSFET transistors biased in subthreshold region are used. This power detector produces the mode-enabled signals to the multi-mode active tag according to the different received RF power. Therefore, the multi-mode...
A two-stage wake-up circuit for semi-passive radio frequency identification (RFID) tag is designed and implemented in SMIC 0.18 ??m CMOS technology. In order to prolong the tag's battery life, a novel two-stage wake-up strategy with self-calibration is proposed. Measurement results show that the wake-up circuit has no static power and is free of process, voltage and temperature (PVT) variations.
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