HgCdTe红外探测器放大电路的低噪声设计  

Low Noise Design of HgCdTe Infrared Detector Amplifying Circuit

作　　者：卫翠玉[1,2] 胡炳樑[1] 于祥凤[1,2] 柳祥[1,2] 马小娜[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所光谱成像技术实验室,陕西省西安市710119 [2]中国科学院研究生院,100039

出　　处：《微计算机信息》2009年第17期276-278,共3页Control & Automation

基　　金：基金申请人:胡炳樑;基金颁发部门:国家自然基金(60532070)

摘　　要：以HgCdTe光伏型红外探测器输出的微弱电流信号为根据对探测器的发前置放大电路和二级放大电路进行设计,运用标准的电路理论建立了等效噪声模型,分析计算电路中各个噪声源引起的噪声,进而运用叠加法计算总的电路的噪声和信噪比可知所设计放大器电路为高增益、低噪声、高信噪比放大电路,最后从工程角度提出了抑制电路噪声的方法。According to the small current signal acquired from the HgCdTe photovohaic infrared detector, the preamplifier circuit and secondary amplifier circuit are designed. The noise model by standard circuit theory is also established. In order to calculate the total circuit noise in the method of superposition and SNR （Signal-to-Noise Ratio） the noises caused by noise sources in the circuit are analyzed and calculated,from which we know that the amplified circuit is a kind of circuit featuring low noise and high SNR. Finally a method of circuit noises inhibition is put forward in the view of engineering.

关 键 词：运算放大电路 红外探测器 能量转换 噪声模型 信噪比 

分 类 号：TN722[电子电信—电路与系统]