摘要
使用晶体管多管组合构成甚低频低噪声放大器可以获得较低的噪声系数,在深水无线电接收中有重要应用。这种放大器噪声电压约为3nv/sqrt(Hz),其指标已经远小于常用的频谱分析仪灵敏度指标,难以实现直接测量。正是由于其特殊性,甚低频低噪声放大器噪声系数的测量方案必须重新设计。论文详细讨论了影响低噪声放大器噪声系数测量的各种因素,包括阻抗匹配、射频信号发生器的背景干扰等因素,提出了完整的测量方案及实施步骤。
A VLF low-noise amplifier in a multi combination way can achieve lower noise figure.It has great significance for deep water radio receiver.This kind of amplifier＇s noise voltage is about 3nv/sqrt（Hz）,can＇t be measured directly due to the value is far less than the commonly used spectrum analyzer＇s sensitivity.Allowing for its particularity,a redesign of the noise coefficient measurement is in demand.In this paper,the factors affecting the noise coefficient measurement of LNA are discussed in detail,such as impedance matching,RF signal generator＇s background interference etc.Eventually a new means of measuring the noise coefficient,with thorough scheme and implementation steps is proposed.
出处
《舰船电子工程》
2015年第3期126-128,157,共4页
Ship Electronic Engineering
