915MHz 射頻辨識系統之被動式標籤電路實現

Abstract

In recent years, the applications of wireless communication become more and more important. Wireless communication plays an essential role in our daily lives. The market of the wireless applications grows up gradually. The demands of the wireless products also increase rapidly. Therefore, the miniaturization and low costs will be the first topic we are interested in. In this thesis, We use the process of TSMC 1P6M 0.18um Mixed signal/RF CMOS to achieve the whole 915MHz UHF RFID passive tag circuit which consists of the multiplier, limiter, voltage reference, series regulator, demodulator modulator and digital signal process. The die area only requires 0.98146 x 0.27396 mm2 without pads. We present dual antenna architecture to increase the backscatter signal strength and try to decrease the power consumption for improved the reading distance between the reader and tag in this thesis. The experimental results show the passive tag can generate 1.5V through the incoming RF signal to power up other internal circuits. The farthest reading distance that we measured in anechoic chamber is approximate 3.5 meters.