대한전자공학회논문지SD (Journal of the Institute of Electronics Engineers of Korea SD)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

이동도 보상 회로와 공통모드 전압 조절기법을 이용한 선형 CMOS OTA

Design of a Linear CMOS OTA with Mobility Compensation and Common-Mode Control Schemes

  • 김두환 (충북대학교 정보통신공학과 컴퓨터정보통신연구소) ;
  • 양성현 (LG 전자 SIC 회로설계그룹) ;
  • 김기선 (충북대학교 정보통신공학과 컴퓨터정보통신연구소) ;
  • 조경록 (충북대학교 정보통신공학과 컴퓨터정보통신연구소)
  • Kim, Doo-Hwan (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University) ;
  • Yang, Sung-Hyun (SIC CD Group, LG Electronics) ;
  • Kim, Ki-Sun (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University) ;
  • Cho, Kyoung-Rok (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University)
  • 발행 : 2006.12.25
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초록

본 논문에서는 새로운 선형 연산 트랜스컨덕턴스 증폭기(OTA)를 제안한다. OTA의 선형성 향상을 위해 이동도 보상 회로와 공통모드 전압 조절기법을 적용했다. 이동도 보상 회로는 각각 트라이오드와 서브스레쉬홀드 영역에서 동작하는 트랜지스터의 경로를 연결하여 이동도 감소를 보상한다. 공통모드 전압 조절기법은 공통모드 피드백(CMFB)과 공통모드 피드포워드(CMFF)로 구성된다. 제안된 기술은 넓은 입력전압 스윙 범위에서 향상된 Gm의 선형성을 나타낸다. 제안된 OTA는 ${\pm}1.1V$의 입력전압 스윙 범위 내에서 ${\pm}1%$의 Gm변화율을 갖고 총고조파 왜곡(THD)은 -73dB 이하이다. 제안된 OTA는 $0.35{\mu}m$ n-well CMOS 공정에서 공급전압이 3.3V를 갖도록 설계되었다.

This paper describes a new linear operational transconductance amplifier (OTA). To improve the linearity of the OTA, we employ a mobility compensation circuit that combines the transistor paths operating at the triode and subthreshold regions. The common-mode control schemes consist of a common-mode feedback (CMFB) and common-mode feedforward (CMFF). The circuit enhances linearity of the transconductance (Gm) under the wide input voltage swing range. The proposed OTA shows ${\pm}1%$ Gm variation and the total harmonic distortion (THD) of below -73dB under the input voltage swing range of ${\pm}1.1V$. The OTA is implemented using a $0.35{\mu}m$ n-well CMOS process under 3.3V supply.

키워드

참고문헌

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