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A novel two stage wakeup unit is proposed for Semi-passive temperature logger tag based on ISO 18000-6c Rev1 air interface protocol for RFID tags. This wakeup unit assists the tag to realize a temperature log1 function, a high sensitivity and low standby current level. It has been designed and fabricated in SMIC 0.18um process as part of the whole tag. Measurement results show that the tag can reduce...
A semi-passive UHF temperature sensor tag compatible with ISO 18000-6C protocol Revision-1 is presented in this paper. Novel power management techniques are proposed to prolong battery life, including two-stage wake-up detection, optimized rectifier design for wireless recharge, quasi CC-CV battery charging, and on-chip battery voltage surveillance. Both real-time temperature sensing and temperature...
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