| 红外探测器的低噪声前置放大电路设计 |
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| 引用本文： | 江婷,李胜,高闽光,童晶晶,李妍. 红外探测器的低噪声前置放大电路设计[J]. 激光与红外, 2018, 48(7): 913-918 |
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| 作者姓名： | 江婷 李胜 高闽光 童晶晶 李妍 |
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| 作者单位： | 1.中国科学院安徽光学精密机械研究所环境光学与技术重点实验室,安徽 合肥 230031；2.中国科学技术大学,安徽 合肥230026 |
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| 基金项目： | 国家自然科学基金面上项目(No.41375027);国家重点研发计划项目(No.2017YFC0209902)资助 |
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| 摘 要： | 在红外探测器的工程应用中,前置放大电路是影响整个探测系统性能的重要组成部分。本文从制冷型碲镉汞光导红外探测器的工作特性出发,设计了一种恒流偏置的低噪声前置放大电路。对电路的工作原理以及噪声性能进行分析,并进行了电路仿真验证以及低噪声的性能测试。实验结果表明,基于窄带滤波法设计的前置放大电路信噪比达到80 dB,具有60~120 dB的可调增益,可以有效抑制噪声并检测到10-8A量级的微变交流信号,在信号检测方面达到了良好的检测效果。
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| 关 键 词： | 光电导探测器；微弱信号；偏置电路；前置放大电路 |
Design of low noise preamplifier circuit for infrared detector |
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| JIANG Ting,LI Sheng,GAO Min-guang,TONG Jing-jing,LI YAN. Design of low noise preamplifier circuit for infrared detector[J]. Laser & Infrared, 2018, 48(7): 913-918 |
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| Authors: | JIANG Ting LI Sheng GAO Min-guang TONG Jing-jing LI YAN |
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| Affiliation: | 1.Key Lab of Environment Optics & Technology,Anhui Institute of Optics and Fine Mechanics,CAS,Hefei 230031,China;2.University of Science and Technology of China,Hefei 230026,China |
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| Abstract: | The preamplifier circuit can affect the performance of the detection system in the engineering application of infrared detector. Based on the working principle of the HgCdTe photoconductive infrared detector,a low-noise preamplifier circuit was designed. The working principle and noise performance of the circuit were analyzed,and the circuit simulation and low-noise test were conducted. The experimental results show that the adjustable gain is 60~120 dB and the signal noise ratio of the preamplifier is 80 dB based on the narrow band filtering method,and it can effectively suppress the noise and the 10-8 A AC signal can be detected. The performance reaches the desired level. |
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| Keywords: | photoconductive detector weak signal bias circuit preamplifier circuit |
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