激光陀螺前置放大电路噪声分析及优化设计  

Noise analysis and optimization design of laser gyro preamplifier circuit

作　　者：曾维 马家君 王昊仁 陈运洪 ZENG Wei;MA Jiajun;WANG Haoren;CHEN Yunhong(College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025

出　　处：《电子设计工程》2021年第18期103-107,114,共6页Electronic Design Engineering

基　　金：国家自然科学基金(61605153);贵州省科技厅自然科学基础研究计划(黔科合LH字[2017]7224号);贵州省教育厅青年科技人才成长项目(黔教合KY字[2017]107号);贵州大学博士基金(贵大人基合字(2016)61号)。

摘　　要：激光陀螺前置放大器是激光陀螺光电检测系统中极为重要的一部分,文中利用激光陀螺信号微弱、极易受干扰的特点,系统地研究了激光陀螺前置放大电路的噪声特性,并设计了一种低噪声、大动态范围的激光陀螺前置放大电路。对放大电路噪声模型进行分析,得出低噪声前置放大器设计中运算放大器、探测器等重要元件的选取原则,在电路结构上采用MOSFET共漏接法构成前置放大电路输入级能有效减小噪声。此外,光电转换电路的反馈支路设计可以提高信噪比。实验结果表明,该放大电路满足激光陀螺的实际要求,并且信噪比得到了提高。Laser gyro preamplifier is an important part of laser gyro photoelectric detection system.In this paper,the noise characteristics of laser gyro preamplifier circuit are systematically studied,and a low noise,large dynamic range laser gyro preamplifier circuit is designed.The noise model of amplifier circuit is analyzed,and the selection principle of operational amplifier,detector and other important components in the design of low noise preamplifier is obtained.The input stage of preamplifier circuit using MOSFET common leakage connection method can effectively reduce noise.In addition,the feedback branch design of photoelectric conversion circuit can improve the signal⁃to⁃noise ratio.The experimental results show that the amplifier circuit meets the practical requirements of laser gyro,and the signal⁃to⁃noise ratio is improved.

关 键 词：激光陀螺 前置放大器 光电转换电路 噪声模型 信噪比 

分 类 号：TN248[电子电信—物理电子学]