摘要
由于电力电子器件内部的低频噪声极其微弱,传统的放大器因自身本底噪声的影响,容易淹没待测器件内部的噪声。因此,为了能够检测电力电子器件内部的低频噪声,设计一款基于无噪声偏置的两级低噪声放大器。利用分立器件组成的差分放大器作为前置级放大器,搭建了具有双端口带通滤波器与三运放仪表放大等双重功能的主放大器。实验结果表明系统的通频带在0.9 Hz～80.2 kHz,具有高增益以及超低噪声的特点,同时在1 kHz时系统的噪声系数低至1.28 dB。
The low frequency noise inside the power electronic devices is extremely weak.The traditional amplifier is often affected by the background noise,low frequency noise need to be measured is submerged.Therefore,in order to measure low frequency noise of power electronic devices,a kind of low noise amplifier based on two-stage amplification is designed.The preamplifier is composed of the difference amplifier composed of JFET.The second stage amplifier using dual port and three op amp instrumentation amplifier,in order to remove noise by active high pass filter and active low-pass filter composed of a band-pass filter.The experimental results show that the system has a high gain and low noise characteristics in the 0.9 Hz^80.2 kHz,while the noise coefficient of the system is as low as 1.28 dB.
作者
项盛荣
樊欣欣
严红梅
XIANG Shengrong;FAN Xinxin;YAN Hongmei(ChangJiang Institute of Technology,Wuhan 430212;State Grid Tongling Power Supply Company,Tongling Anhui 44000,China;State Grid Zongyang Power Supply Company,Tongling Anhui 44000,China)
出处
《电子器件》
CAS
北大核心
2019年第2期383-386,共4页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目(61271115)
关键词
低频低噪声
前置放大器
分立元件
高增益
Low frequency noise
preamplifier
discrete components
high gain
作者简介
项盛荣 (1961-),男,汉族,武汉人,长江工程职业技术学院,副教授,学士,主要从事电子技术和高职教育的研究;樊欣欣(1990-),男,汉族,亳州人,国网铜陵供电公司,工程师,硕士,主要研究方向为电力电子器件的可靠性研究,Fanxxok@126.com;严红梅(1995-),女,汉族,巴中人,国网安徽枞阳供电公司,助理工程师,学士,主要研究方向为电力财会审计。
