Design of Reader Transmitter and Tag Baseband Circuit for Radio-Frequency Identification
Date Issued
2007
Date
2007
Author(s)
Liu, Chi-En
Abstract
A 2.45 GHz RFID transmitter module has been designed and verified using FR4 printedircuit board. The mixer is designed using Gilbert-cell-based differential pair to switch theO signal path from the baseband signal of encoder to generate the ASK RF signal at theutput of mixer. It simplifies the circuit design of D/A converter. The data rate can be up to50 kbps at typical range of 10 m under the raw-data bit error rate of 10−3. The transmitteronsumes 483 mW of power at 5 V supply voltage, of which only 289 mW is consumed byhe mixer. The amplifier has the power gain of 13.5 dB at 2.45 GHz, and the VSWR at theutput port is 1.35. collision-free baseband circuit of passive RFID tag is designed and implemented inPGA. It takes only about nTb to identify a single tag of n bits, and of about (16m+n+13)Tbo respond to the reader m words of data. The digital clock generator is used instead ofonventional oscillators to improve frequncy accuracy.
Subjects
Radio-frequency identification (RFID)
reader
amplitude-shift keying (ASK)
transmitter
Type
thesis
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