中国集成电路
中國集成電路
중국집성전로
CHINA INTEGRATED CIRCUIT
2012年
5期
22-25
,共4页
汤益明%万培元%郭乐乐%郎伟%林平分
湯益明%萬培元%郭樂樂%郎偉%林平分
탕익명%만배원%곽악악%랑위%림평분
差分运算放大器%共模反馈(CMFB)%正(负)反馈%两个反馈环路%锁死状态
差分運算放大器%共模反饋(CMFB)%正(負)反饋%兩箇反饋環路%鎖死狀態
차분운산방대기%공모반궤(CMFB)%정(부)반궤%량개반궤배로%쇄사상태
Differential Op-amp,%Common mode feedback ( CMFB ),%Positive ( negative ) feedback,%Two feedback loops%Latching state
本文提出了用在增益可调放大器中，差分电压放大器中共模反馈稳定性的分析。本文分析了在差模运算放大器中内部共模反馈电路（CMFB）和外部由电阻构成的正反馈网络。共模反馈电路用来确保运算放大器的稳定性，外部的正反馈网络需要留心防止“锁死状态”。本文的运放采用折叠式共源共栅结构，用SMIC0．18μm混合信号工艺进行流片。
本文提齣瞭用在增益可調放大器中，差分電壓放大器中共模反饋穩定性的分析。本文分析瞭在差模運算放大器中內部共模反饋電路（CMFB）和外部由電阻構成的正反饋網絡。共模反饋電路用來確保運算放大器的穩定性，外部的正反饋網絡需要留心防止“鎖死狀態”。本文的運放採用摺疊式共源共柵結構，用SMIC0．18μm混閤信號工藝進行流片。
본문제출료용재증익가조방대기중，차분전압방대기중공모반궤은정성적분석。본문분석료재차모운산방대기중내부공모반궤전로（CMFB）화외부유전조구성적정반궤망락。공모반궤전로용래학보운산방대기적은정성，외부적정반궤망락수요류심방지“쇄사상태”。본문적운방채용절첩식공원공책결구，용SMIC0．18μm혼합신호공예진행류편。
Design considerations are presented for stabilizing the common-mode feedback （ CMFB ） loop in fully differential voltage feedback CMOS amplifiers used in programmable gain Control amplifiers. After considerations in designing a balanced differential operational amplifier, internal CMFB circuitry and external feedback network are investigated. The former insures the amplifier stay stability, and the latter should be carefully to avoid ＇latching states＇ . cascade circuit implemented in 0.18urn CMOS mixed signal process of SMIC is presented, based on a folded topology
