The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A CMOS TX Leakage Canceller Using an Autotransformer for RFID Application

오토트랜스포머를 이용한 RFID용 CMOS 송신 누설 신호 제거기

  • Choi, In-Duck (Department of Electronic Engineering, Ajou University) ;
  • Kwon, Ick-Jin (Department of Electronic Engineering, Ajou University)
  • 최인덕 (아주대학교 전자공학과) ;
  • 권익진 (아주대학교 전자공학과)
  • Published : 2011.08.31
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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.

본 논문에서는 UHF RFID 리더에서의 오토트랜스포머를 이용한 가변 송신 누설 신호 제거기를 제안하였다. 제안된 송신 누설 신호 제거기는 오토트랜스포머와 디지털 가변 캐패시터, 가변 저항, 보상 증폭기로 구성되었으며, 0.13 ${\mu}m$ 1-폴리 6-메탈 RF CMOS 공정을 사용하여 설계되었다. 시뮬레이션 결과, 제안된 구조는 송신단에서 수신단으로 신호가 전송될 때 55 dB 이상의 송신 누설 신호 제거도를 보이며, 2.5 dB의 수신 삽입 손실을 갖는다. 송신 누설 신호 제거 회로는 825 MHz에서 985 MHz까지 디지털 주파수 조정이 가능하며, CMOS 공정으로 집적될 수 있다.

Keywords

References

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