电子元件与材料2017，Vol.36Issue(10)：53-57,5.DOI:10.14106/j.cnki.1001-2028.2017.10.009
一种改进输入级结构的轨至轨运算放大器设计
Design of a rail-to-rail operational amplifier with improved input stage structure
宋明歆 1关志强1
作者信息
- 1. 哈尔滨理工大学 应用科学学院,黑龙江 哈尔滨 150080
- 折叠
摘要
Abstract
Based on 0.18μm CMOS standardprocess, a rail-to-rail operational amplifier circuit which can improve the input stage structure was designed.The circuit was composed of the input stage circuit, the cascode amplifier circuit, the common source output circuit and the bias circuit. The input stage circuit was improved as a pre amplifier circuit by introducing the MOS coupling with positive feedback, a detailed analysis was carried out, and the circuit was simulated by using Cadence software. The simulation results indicate that the circuit has a DC open-loop gain of 80 dB, which is about 20 dB higher than the ordinary structure under the same parameters. The phase margin is 73°, the common-mode rejection ratio (CMRR) is 107 dB at low frequency, and the common-mode input voltage range also meets the full swing.关键词
轨至轨/正反馈/负阻抗/运算放大器/折叠式共源共栅结构/弥勒补偿Key words
rail-to-rail/positive feedback/negative impedance/operational amplifier/folded cascode structure/Miller compensation分类
信息技术与安全科学引用本文复制引用
宋明歆,关志强..一种改进输入级结构的轨至轨运算放大器设计[J].电子元件与材料,2017,36(10):53-57,5.
