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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

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.

Keywords

Grounded Active Inductor;Spiral Inductor;Gyrator-C;Variable LC-Resonator;Varactor

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