微电子学
微電子學
미전자학
MICROELECTRONICS
2010年
1期
29-31,36
,共4页
共模反馈电路%折叠共源共栅电路%运算放大器
共模反饋電路%摺疊共源共柵電路%運算放大器
공모반궤전로%절첩공원공책전로%운산방대기
Common mode feedback circuit%Folded cascade circuit%Operational amplifier
在两级共源共栅CMOS运算放大器中,设计了一种新的共模反馈电路.这种电路克服了一般共模反馈电路存在的限制输出摆幅的缺点,在稳定电路直流工作点的同时,能有效提高电路的输出摆幅.通过对共模电路结构的分析,证明了其功能原理的正确性.基于0.18 μm (3 V) CMOS工艺库,用Hspice软件对电路结构进行了仿真验证.结果显示,电路低频增益达到120 dB,功耗不到0.24 mW.
在兩級共源共柵CMOS運算放大器中,設計瞭一種新的共模反饋電路.這種電路剋服瞭一般共模反饋電路存在的限製輸齣襬幅的缺點,在穩定電路直流工作點的同時,能有效提高電路的輸齣襬幅.通過對共模電路結構的分析,證明瞭其功能原理的正確性.基于0.18 μm (3 V) CMOS工藝庫,用Hspice軟件對電路結構進行瞭倣真驗證.結果顯示,電路低頻增益達到120 dB,功耗不到0.24 mW.
재량급공원공책CMOS운산방대기중,설계료일충신적공모반궤전로.저충전로극복료일반공모반궤전로존재적한제수출파폭적결점,재은정전로직류공작점적동시,능유효제고전로적수출파폭.통과대공모전로결구적분석,증명료기공능원리적정학성.기우0.18 μm (3 V) CMOS공예고,용Hspice연건대전로결구진행료방진험증.결과현시,전로저빈증익체도120 dB,공모불도0.24 mW.
A novel common mode feedback (CMFB) circuit was designed for 2-stage cascode CMOS operational amplifier, in which cascoded-Miller compensation was used. The proposed CMFB circuit solves the problem of limited output swing, which is inherent to CMFB circuit, and stabilizes the DC voltage at normal operating point. The structure of CMFB circuit was analyzed. Hspice simulation based on 0.18 μm CMOS 3 V mixed signal process showed that the circuit had a DC open gain up to 120 dB, with less than 0.24 mW of power.
