Design of Reader Transmitter and Tag Baseband Circuit for Radio-Frequency Identification

• Main Authors: Chi-En Liu, 劉奇恩
• Other Authors: Jean-Fu Kiang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/17683171745661345544

碩士 === 臺灣大學 === 電機工程學研究所 === 96 === A 2.45 GHz RFID transmitter module has been designed and verified using FR4 printed circuit board. The mixer is designed using Gilbert-cell-based differential pair to switch the LO signal path from the baseband signal of encoder to generate the ASK RF signal at the output of mixer. It simplifies the circuit design of D/A converter. The data rate can be up to 150 kbps at typical range of 10 m under the raw-data bit error rate of 10−3. The transmitter consumes 483 mW of power at 5 V supply voltage, of which only 289 mW is consumed by the mixer. The amplifier has the power gain of 13.5 dB at 2.45 GHz, and the VSWR at the output port is 1.35. A collision-free baseband circuit of passive RFID tag is designed and implemented in FPGA. It takes only about nTb to identify a single tag of n bits, and of about (16m+n+13)Tb to respond to the reader m words of data. The digital clock generator is used instead of conventional oscillators to improve frequncy accuracy.