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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of Variable Active Inductor with Feedback LC-Resonator for Improvement of Q-Factor and Tuning of Operating Frequency

Q 지수의 개선과 동작 주파수 조절을 위해 궤환 LC-공진기를 이용한 가변 능동 인덕터의 설계

  • Seo, Su-Jin (IDEC W.G. & Dept. of Info. And Comm. Engineering, Chonbuk National University) ;
  • Ryu, Nam-Sik (XRONet Corporation) ;
  • Choi, Heung-Jae (IDEC W.G. & Dept. of Info. And Comm. Engineering, Chonbuk National University) ;
  • Jeong, Yong-Chae (IDEC W.G. & Dept. of Info. And Comm. Engineering, Chonbuk National University)
  • 서수진 (전북대학교 전자정보공학부 & 반도체설계교육센터) ;
  • 유남식 (㈜카이로넷) ;
  • 최흥재 (전북대학교 전자정보공학부 & 반도체설계교육센터) ;
  • 정용채 (전북대학교 전자정보공학부 & 반도체설계교육센터)
  • Published : 2008.03.31
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Abstract

In this paper, a new variable active inductor using a conventional grounded active inductor with feedback variable LC-resonator is proposed. The grounded active inductor is realized by the gyrator-C topology and the variable LC-resonator is realized by the low-Q spiral inductor and varactor. This variable LC-resonator can compensate the degradation of Q-factor due to parasitic capacitance of a transistor, and the frequency range with high Q-factor is adjustable by resonance frequency adjustment of LC-resonator. The fabricated variable active inductor with Magnachip $0.18{\mu}m$ CMOS process shows that high-Q frequency range can be adjusted according to varactor control voltage from 4.66 GHz to 5.45 GHz and Q-factor is higher than 50 in the operating frequency ranges. The measured inductance at 4.9GHz can be controlled from 4.12 nH to 5.97 nH by control voltage.

본 논문에서는 종래의 접지된 능동 인덕터 구조와 궤환 가변 LC-공진기를 이용한 새로운 가변 능동 인덕터를 제안하였다. 접지된 능동 인덕터는 자이레이터-C 구조로 구현되며, 가변 LC-공진기는 낮은 Q 지수를 갖는 나선 인덕터와 바렉터로 이루어진다. 가변 LC-공진기는 트랜지스터의 기생 커패시턴스에 의한 Q 지수의 감소를 보상하며, LC-공진기의 공진 주파수 조절에 의해 높은 Q 지수를 갖는 주파수 대역을 가변할 수 있다. 매그나칩 $0.18{\mu}m$ 공정을 이용하여 제작된 가변 능동 인덕터는 $4.66{\sim}5.45GHz$ 대역에서 바랙터 제어 전압 조정에 의해 높은 Q 지수를 갖는 주파수를 조정할 수 있으며, 동자 대역에서 50 이상의 Q 지수를 제공한다. 또한, 바렉터 제어전압 조정으로 5.1 GHz에서 $4.12{\sim}5.97nH$의 가변 인덕턴스 값을 얻을 수 있었다.

Keywords

References

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