微弱信号检测的超低噪音宽带放大器设计  

The design of an ultra-low-noise wideband amplifier for the weak signal measurement

作　　者：秦正波[1] 任羊弟 王辉[1] QIN Zheng-bo;REN Yang-di;WANG Hui(Department of Physics,Anhui Normal University,Wuhu 241000,Anhui,China)

机构地区：[1]安徽师范大学物理与电子信息学院

出　　处：《现代经济信息》2017年第5期339-340,共2页Modern Economic Information

基　　金：国家自然基金(21503003;11674003和61475001);安徽自然科学基金(1608085QA10);安徽高校自然科学基金(KJ2015A032);安徽省省级质量工程项目

摘　　要：本文简要报道了微型超低噪音宽带快电荷灵敏前置放大器。该放大器主要采用高增益宽带低噪音电压反馈型集成运放芯片OPA847,其低电压输入噪音低至0.85n V/Hz1/2,带宽高至3.9GHz。整个成本低至数百元,是同类型产品的1/10或更少,该前置放大器具有电路结构简单、紧凑,超高速,极低噪音,超高稳定性等优点。经实验测试,该放大器能有效进行微弱信号的放大和噪音的抑制,可广泛应用于普通物理实验的光电探测的前置放大,科研上也具有较可观的应用前景。A miniature,ultra-low-noise,and high-sensitivity preamplifier has been introduced in brief in this paper.The design is adopted which mainly combines a high-gain bandwidth,low-noise,voltage-feedback operational amplifier OPA847.The input voltage noise density reaches to as low as 0.85nV/Hz1/2 and bandwidth gets up to 3.9 GHz.The device costs only several hundred yuan,which is less than one tenth of cost for similar products.The preamplifier has the advantage of simple,compact,super-high speed,ultra-low noise and super-high stability et al.The amplifier has the function of the gain of weak signal and suppression of noise after testing.It is applied to the amplification of photoelectric detection and has the application foreground for scientific research.

关 键 词：微弱信号检测 前置放大器 超低噪音 

分 类 号：TN722[电子电信—电路与系统]