轨到轨输入输出范围运算放大器的噪声分析和优化

轨到轨输入输出范围运算放大器的噪声分析和优化
权进国1 张献英2
（1.清华大学深圳研究生院，深圳 2.中国网络通信集团有限公司深圳分公司， 深圳 518055）
摘 要：这篇文章设计了一个轨到轨（Rail-to-Rail）输入输出范围的低噪声运算放大器，在输入级采用电流补偿的方法来稳定该运算放大器在整个输入共模范围内的跨导，在输出级使用了AB 类的输出方法来提高运算放大器的输出范围，且详细分析了该运算放大器的噪声性能，在此基础上给出了改善该运算放大器噪声性能的方法，以此来提高该运算放大器的动态范围。
关键词：轨到轨；跨导；闪烁噪声；运算放大器；动态范围
Noise analysis and improvement of Rail-to-Rail input and output range operational amplifier
QUAN Jin-guo1, ZHANG Xian-ying2
（1.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055，China
2.Shenzhen branch of CHINA NETCOM, Shenzhen 518057，China）
Abstract: This article gives a low noise Rail-to-Rail input and output range operational amplifier. In the input stage, current compensation technique is used
to give a constant transconductance in the whole common mode input range; in the output stage, a simple class AB output stage is used to improve the output
range. The noise character of the operational amplifier is analyzed, and the way to improve the noise character of this operational amplifier is given, as can
improve the dynamic range of this operational amplifier.
Key words: Rail-to-Rail; transconductance; flicker noise; operational amplifier; dynamic range