Patent ID: 8292175
Filing Date: 2012-10-23
Classification: G06K

Abstract:
1. A tag device comprising: a reception module converting a received high frequency signal into a scale level, and converting the converted scale level into a digital signal to output the same; a transmission module modulating a transmission signal to output the same; and a controller controlling the reception module and the transmission module; wherein the reception module comprises a first signal processor converting the received high frequency signal into a log scale by using a log amplifier that receives a received signal through its positive terminal and converts the received signal into the scale level to output a DC level analog signal; a second signal processor amplifying a gain of the signal converted into the log scale by the first signal processor; a third signal processor controlling a signal level and a gain of the second signal processor under control of the controller; and a fourth signal processor changing an output signal of the second signal processor according to an output signal of the third signal processor to output the signal as a digital signal.