| 差动放大电路共模干扰抑制能力的研究 |
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| 引用本文： | 牛滨,陈松景,孙晶华,梁原华.差动放大电路共模干扰抑制能力的研究[J].哈尔滨理工大学学报,2009,14(1):92-95. |
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| 作者姓名： | 牛滨 陈松景 孙晶华 梁原华 |
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| 作者单位： | 哈尔滨理工大学,测控技术与通信工程学院,黑龙江,哈尔滨,150040 |
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| 基金项目： | 黑龙江省教育厅科学技术研究项目 |
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| 摘 要： | 电磁流量计输出的流速信号非常微弱，且常叠加共模干扰，经信号调理电路放大后，会导致信噪比很低，甚至淹没有用信号．针对这问题提出了利用前置放大电路有效抑制共模干扰，对其进行定性、定量分析，给出实际可行的提高差动放大电路输入阻抗的设计，并进行分析、推导和对比计算，证明其可以很大限度抑制共模干扰，提高测量准确度．
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| 关 键 词： | 差动放大电路 共模干扰 输入阻抗 电磁流量计 |
The Research of Common-mode Rejection Capability of the Differential Amplifier |
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| NIU Bin,CHEN Song-jing,SUN Jing-hua,LIANG Yuan-hua.The Research of Common-mode Rejection Capability of the Differential Amplifier[J].Journal of Harbin University of Science and Technology,2009,14(1):92-95. |
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| Authors: | NIU Bin CHEN Song-jing SUN Jing-hua LIANG Yuan-hua |
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| Affiliation: | School of Measure-control Technology and Communication Engineering;Harbin University of Science and Technology;Harbin 150040;China |
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| Abstract: | The common-mode interference is always interfused with the weak velocity signal of the electromagnetic flowmeter,which can be amplified by the signal processing circuit.This causes low signal-to-noise ratio and even submerge the velocity signal.The paper used the preamplifier to reject common-mode interference effectively.We did qualitative analysis and quantitative analysis.We also showed practical design which can improve the amplifier's input impedence.Then we did analysis,deduction and contrast for it.T... |
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| Keywords: | differential amplifier common-mode interference input impedance electromagnetic flowmeter |
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