| 一款低噪声低频频谱搬移电路的设计 |
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| 引用本文： | 吴鹏,沈博,郑彦鹏,李志华,陈浩,郑振宇,鲁永康.一款低噪声低频频谱搬移电路的设计[J].电测与仪表,2010,47(2). |
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| 作者姓名： | 吴鹏 沈博 郑彦鹏 李志华 陈浩 郑振宇 鲁永康 |
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| 作者单位： | 中国地质大学机械与电子信息学院,武汉,430074;国家海洋局第一海洋研究所,山东青岛,266061 |
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| 基金项目： | 国家“863”资助项目(2008AA09Z203) |
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| 摘 要： | 地球物理探测领域中的频率域电磁法仪器,需要对低频微弱信号进行检测,有时受某些条件的制约,很难采用增大人工场源的方法来增大信噪比(S/N),因而采用常规的滤波放大方法难于提纯有用信号。本文设计了一款低频低噪声频谱搬移电路,电路由低噪声前置放大器(LNA)、基准信号源(Fre)f、开关式相敏检波器(PSD)及固定频率的窄带通滤波器组成,经组装、调试与测试,折合到输入端短路时的噪声电压为,由于Fref设置范围为1~9999Hz,步进为1Hz,通过改变Fref的频率就可实现对不同频率的微弱信号的检测。
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| 关 键 词： | 低噪声 低频 微弱信号检测 频谱搬移 |
Design of a Low-frequency and Low-noise Spectrum Move Circuit |
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| WU Peng,SHEN Bo,ZHENG Yan-peng,LI Zhi-hua,CHEN Hao,ZHENG Zhen-yu,LU Yong-kang.Design of a Low-frequency and Low-noise Spectrum Move Circuit[J].Electrical Measurement & Instrumentation,2010,47(2). |
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| Authors: | WU Peng SHEN Bo ZHENG Yan-peng LI Zhi-hua CHEN Hao ZHENG Zhen-yu LU Yong-kang |
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| Affiliation: | 1.Institute of Mechanical and Electronic Information;China University of Geosciences;Wuhan 430074;China.2.First Institute of Oceanograply;Qingdao 266061;Shandong;China |
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| Abstract: | The frequency domain electromagnetic method apparatus,used in the field of geophysical exploration,which need for low-frequency weak signal detection,sometimes subject to certain conditions,is very difficult to increase the use of factory methods to increase the source signal to noise ratio(S / N),And thus enlarge the use of conventional methods of filtering the useful signal difficult to purify.In this paper,the design of a spectrum of low-frequency low-noise removal circuit,Circuit by the low-noise preamp... |
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| Keywords: | low-noise low-frequency weak signal detection spectrum move |
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