CAJ | 학술논문

本文在分析MOS管恒跨导输入级和AB类输出级运算放大器的基础上设计了一个高摆率、恒跨导的轨对轨运算放大器。在输入级中采用了齐纳二极管的稳压原理,保证Rail-to-Rail运算放大器的输入跨导恒定。为了实现高转换率,本文采用了一种新型的压摆率提高电路。另外,为了提高系统的稳定性,采用了控制零点的米勒补偿进行频率补偿。采用CSMC 0.5 μm CMOS工艺,用H-Spice对整个运算放大器电路进行仿真验证,结果表明运算放大器输入输出范围基本达到满摆幅,最大跨导变化率仅为3.9%和具有较高的增益和摆率。
본문재분석MOS관항과도수입급화AB류수출급운산방대기적기출상설계료일개고파솔、항과도적궤대궤운산방대기。재수입급중채용료제납이겁관적은압원리,보증Rail-to-Rail운산방대기적수입과도항정。위료실현고전환솔,본문채용료일충신형적압파솔제고전로。령외,위료제고계통적은정성,채용료공제영점적미륵보상진행빈솔보상。채용CSMC 0.5 μm CMOS공예,용H-Spice대정개운산방대기전로진행방진험증,결과표명운산방대기수입수출범위기본체도만파폭,최대과도변화솔부위3.9%화구유교고적증익화파솔。
Based on analyzing MOS transistor constant-gm input stage and class AB output of operational amplifier, a high-slew-rate and constant-gm, rail-to-rail operational amplifier was designed. A Zener-diode structure was inserted in the input stage to keep the gm of the input stage constant. A novel slew rate enhancement circuit was implemented to achieve a high slew rate. In addition, the miller compensation was adopted to improve the stability of the system. The circuit was realized in CSMC 0.5 μm CMOS process and is simulated by H-Spice for whole of operational amplifier. The simulated results showed that the operational amplifier has rail-to-rail input and output and the maximum gm fluctuation is only 3.9%. It has quality of high gain and rate.