甚低频低噪声放大器的设计与测量  

Design and Measurement of a VLF Low-Noise Amplifier

作　　者：蒋宇中[1] 陈传克[1,2] 张曙霞[1] 刘飞[3] 

机构地区：[1]海军工程大学电子工程学院 [2]中国人民解放军92038部队 [3]中国人民解放军91919部队

出　　处：《电子器件》2015年第4期769-773,共5页Chinese Journal of Electron Devices

摘　　要：为解决深水甚低频无线电接收中微弱通信信号难以检测的问题,设计具有优秀噪声性能的甚低频低噪声前置放大器。通过对放大器噪声匹配问题的深入分析,重点讨论了直流工作点选择、输入阻抗匹配、复合电磁屏蔽结构等关键技术点,大大降低放大器的噪声系数。考虑到放大器噪声测量的特殊困难,设计一套完整的测量方案和实施步骤。测试结果表明该低噪声放大器噪声系数达到1.71 d B,比经典放大器提高至少1.5 d B。When the VLF receiver is located in deep water,the weak communication signals are difficult to be detected,in order to solve the problem,a VLF low-noise preamplifier with excellent noise performance is designed. We first discussed some key technical points such as DC operating point selection,input impedance matching and the structure of Compound Electromagnetic Shielding by deeply analyzing the noise matching problems of amplifier,hence the noise figure of the amplifier can be lowered down greatly. A complete measurement solution and implementation steps are established for the special difficulties of the measurement of noise figure. The final test results show the noise figure is 1. 71 d B,reduced by at least 1. 5 d B compared with the classic amplifiers.

关 键 词：低噪声放大器 噪声系数 噪声匹配 电磁屏蔽 甚低频 

分 类 号：TN919.6[电子电信—通信与信息系统]