RFID Tag with Real-Time Wake-Up Function utilizing Communication Signal with Periodic Structure

摘要

An RFID(Radio Frequency IDentification) tag for providing a real-time wakeup function by utilizing a communication signal having a periodic structure is provided to use the wakeup function continuously in real-time, realize a wakeup time response at an ultra high speed shorter than a preamble time, and reduce power consumption in a standby state by using an ultra low power driving circuit. A hardware filter(12) separates a frequency component having a constant and regular structure from a communication signal. The separated frequency component is operated based on an RZ(Return Zero) signal included in received data while a data packet is found. A discriminator(15) and a control switch(16) are operated whether a signal passing the filter and having a predetermined frequency is found. Stability and modulation/demodulation efficiency are improved by implementing an intelligent function for discriminating noise from the signal passing the discriminator/control switch in a main RFID tag circuit(17). Power consumption is minimized by applying the signal passing the discriminator/control switch to a switch of a battery(18).