感应同步器输出信号的低噪声前放技术研究  

Study on the Low-noise Preamplifier of Inductosyn's Output Signal

作　　者：马永泉[1] 代作晓[1] 华建文[1] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083

出　　处：《科学技术与工程》2008年第14期3927-3930,共4页Science Technology and Engineering

基　　金：国家"863"计划课题(2007AA12Z179)资助

摘　　要：感应同步器的输出信号微弱,且包含有原端连续绕组感应噪声,要求设计具有低噪声、高增益特性的前置放大器。针对这种设计要求,通过利用传感器和放大器噪声分析理论,对感应同步器输出级、前放电路输入级进行噪声建模,分析得出对应感应同步器输出信号的噪声系数和最佳源电阻,并以此为依据选择出了合理的低噪声前放输入级器件。计算和仿真分析表明,所选放大器件能与感应同步器进行噪声匹配,该前放电路能够满足感应同步器输出信号的放大要求。Inductosyn outputs a low-level signal which requires a low-noise, high gain preamplifier to containing much noise induced from the primary winding, amplify it. Based on the sensor and amplifier＇s noise theory, the analysis and design of the preamplifier was implemented through modeling the inductosyn＇s output stage and the preamplifier＇s input stage, while calculating the inductosyn output signal＇s noise factor and optimum source resist- ance. Upon these, a reasonable low-noise preamplifier＇s input stage device was selected. The calculation and simulation shows the amplifier device can match the noise among the inductosyn＇s noise very well. The designed amplifier can meet the requirement of the inductosyn＇s output signal.

关 键 词：感应同步器 前置放大器 噪声 噪声匹配 噪声系数 最佳源电阻 

分 类 号：TN722.3[电子电信—电路与系统]