대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1993년도 하계학술대회 논문집 A
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- Pages.479-482
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- 1993
고주파용 필터구현을 위한 개선된 CMFB회로를 이용한 CMOS Op-amp 설계
A CMOS Op-amp Design of Improved Common Mode Feedback(CMFB) Circuit for High-frequency Filter Implementation
- Lim, Dae-Sung (Dept. of Electrical Eng, Chonbuk Univ.) ;
- Choi, Young-Jae (Dept. of Electrical Eng, Chonbuk Univ.) ;
- Lee, Meung-Su (Dept. of Electrical Eng, Chonbuk Univ.) ;
- Kim, Dong-Yong (Dept. of Electrical Eng, Chonbuk Univ.)
- 발행 : 1993.07.18
초록
A fully balanced differential amplifier can achieve high-gain wide-bandwidth characteristics. And also, Offset PSRR, CMRR and Noise performance of that are excellent, but these merits can be achieved only when the architecture holds fully balanced. Commonly, the fully balanced differential amplifier has a common mode feedback(CMFB) circuit in order to maintain the balance. This paper presents improved characteristics of the CMFB circuit and designs the wide-bandwidth CMOS Op-amp. The unity gain bandwidth of this Op-amp is 50MHz with the load capacitor 2pF, and the value of phase margin is
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