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A low-Gain Error Amplifier for Common-Mode Feedback Circuit  

정근정 (LG전자 주식회사)
노정진 (LG전자 주식회사)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.40, no.9, 2003 , pp. 714-723 More about this Journal
Abstract
An effective technique to increase the signal swing and reduce noise is to use fully-differential -circuits. However, design of a common-mode feedback (CMFB) circuit that stabilizes the common-mode output level is essential. In this paper, a general description is given to fully-differential amplifiers with their CMFB loops, then a new error amplifier that is just composed of transistors and stabilizes the DC output level is proposed. We designed a simple and efficient bias circuit that allows the stability and maximum input swing. Simulation result shows the enhanced phase margin and increased differential-mode input swing with a proposed error amplifier.
Keywords
Common mode 전압;fully-differential 회로;아날로그회로;피드백;에러증폭기;
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