光电探测中低噪声前置放大器的设计  

The design of a prepositional amplifier with low-noises in photoelectricity detection

作　　者：兰羽[1] 张玉洁[1] 

机构地区：[1]陕西工业职业技术学院,咸阳712000

出　　处：《国外电子测量技术》2012年第6期84-86,共3页Foreign Electronic Measurement Technology

摘　　要：为了检测光电探测中微弱的光电信号,分析了放大器噪声产生原因及放大器取得最小噪声系数时对应的最佳源电阻,采用了反相并联放大器法及有源器件的选择上实现噪声匹配,来降低前置放大器的噪声,对电路安装测试表明,反相并联10级放大器,信噪比提高3倍,提出了无源器件及电源对放大器的干扰问题的解决方法。To detect faint photoelectric signals in photoeleetricity detection, this article analyses the causes of me noises Hum a amplifiers and the best source resistance when an amplifier gains the lowest noises coefficient. It uses the methods of reverse par-allel collection of amplifier and noises-matching with the choices of source components to lower the noises from prepositional am-plifiers. Circuit installation and testing show that the parallel 10 inverting amplifier signal to noise ratio increased by 3 times. It puts forward how to solve the interference between Passive components and power to an amplifier.

关 键 词：前置放大器 噪声分析 最佳源电阻 电路调试 

分 类 号：TN722.3[电子电信—电路与系统]