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http://dx.doi.org/10.5515/KJKIEES.2011.22.8.784

A CMOS TX Leakage Canceller Using an Autotransformer for RFID Application  

Choi, In-Duck (Department of Electronic Engineering, Ajou University)
Kwon, Ick-Jin (Department of Electronic Engineering, Ajou University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.22, no.8, 2011 , pp. 784-789 More about this Journal
Abstract
In this paper, a tunable integrated transmitter leakage canceller based on an autotransformer for ultra-high-frequency (UHF) RFID readers is presented. The proposed TX leakage canceller consists of an autotransformer, a digital tuning capacitor, a voltage controlled tuning resistor, and a compensating amplifier, and it is designed using 0.13 ${\mu}m$ 1-poly 6-metal RF CMOS process. The simulation results show that the proposed structure has over 55 dB rejection characteristic between a transmitter and a receiver and a 2.5 dB of the RX insertion loss. The TX leakage canceller can be digitally tuned from 825 MHz to 985 MHz with the tuning capacitor and it can be fully integrated.
Keywords
Transmitter(TX) Leakage Cancellation; Autotransformer; UHF RFID;
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