Patent ID: 8274369
Filing Date: 2012-09-25
Classification: H04Q

Abstract:
1. An RFID device having a nonvolatile ferroelectric memory, receiving a radio frequency signal, and generating a power voltage for driving the RFID device, the RFID device comprising: a power-on reset unit configured to sense the power voltage in order to output a power sensing signal; a demodulator configured to demodulate the radio frequency signal and outputting a detecting signal; a radio frequency signal sensing unit configured to sense a voltage level of the detecting signal corresponding to the radio frequency signal, and outputting a radio frequency sensing signal according to the sensed voltage level; and a power-on reset mixer configured to receive the power sensing signal and the radio frequency sensing signal, and outputting a power-on reset signal according to the voltage levels of the power sensing signal and the radio frequency sensing signal, wherein the radio frequency signal sensing unit comprises: a power generating unit configured to adjust an effective resistance in response to a change in the level of the power voltage in order to output a first voltage having a given level; a delay unit configured to delay the detecting signal for a given time in response to the first voltage in order to output a detecting delay signal; and a radio frequency signal generating unit configured to perform a logical operation on the detecting signal and the detecting delay signal in order to generate the radio frequency sensing signal.