Device of detecting wake-up burst of active rfid tags and method theref

A device and a method for detecting wakeup burst in an active RFID(Radio Frequency IDentification) tag are provided to reduce power consumption of the active RFID tag by activating the active RFID tag based on the wakeup burst detected from a signal, which is received from an RFID reader, when the RFID tag starts communication. A trigger signal generator(110) generates trigger signals continuously at predetermined intervals by responding to an input signal received from an RFID reader, and a counter(120) is activated by receiving one of the generated trigger signals and counts sub burst of the input signal while the trigger signal is kept. A comparator(130) detects whether the input signal is wakeup burst depending on matching between a counted value and a predetermined reference value. A wakeup signal generator(140) generates a wakeup signal when all values counted while each trigger signal is kept are matched with the reference value. A reset unit(150) disables the trigger signal generator and the counter when the counted value is different from the reference value.