摘要
通过调制和解调,斩波调制技术可以有效降低放大器的输入噪声和失调电压,提升放大器的共模抑制能力,近年来广泛应用于高性能模拟前端设计。放大器的失调电压和低频噪声被调制到斩波频率,放大器输出会产生较大的纹波,需要进行滤波处理。文章介绍了斩波放大器工作原理及输出纹波的产生机制,总结了目前用于斩波放大器输出纹波抑制的研究成果,讨论了各种相关结构技术的优缺点。这为采用斩波技术的芯片设计研发人员提供了有益参考。
Through modulation and demodulation, the chopping technique could effectively reduce amplifier’s input referred noise and offset, and improve the common-mode rejection ability. Therefore, it had been widely used in high-performance analog front-end design. Due to the up modulated offset and low frequency noise, large ripple appeared at the output of the amplifier, which required additional filtering process. An introduction of working principles of chopper amplifiers and mechanisms of output ripple were presented in this paper. A review of state-of-the-art ripple rejection techniques was given, which provided a useful reference for designers adopting the chopping technique.
作者
张三锋
周雄
李强
ZHANG Sanfeng;ZHOU Xiong;LI Qiang(Institute of Integrated Circuits and S ystem s,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,P.R.China)
出处
《微电子学》
CAS
北大核心
2021年第2期235-239,共5页
Microelectronics
基金
国家自然科学基金资助项目(61534002,61904027,61761136015)。
关键词
斩波
放大器
输入失调
纹波
chopping
amplifier
input offset
output ripple
