| 压电信号采集中放大电路前置级的设计 |
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| 引用本文： | 史瑞超,刘红星,郁健,白志平. 压电信号采集中放大电路前置级的设计[J]. 现代电子技术, 2011, 34(10): 179-181 |
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| 作者姓名： | 史瑞超 刘红星 郁健 白志平 |
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| 作者单位： | 南京大学电子科学与工程学院,江苏南京,210093 |
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| 基金项目： | 无锡科技引导项目，南京大学金川联合实验室资助项目 |
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| 摘 要： | 压电传感器输出的压电信号较弱，输出阻抗高且叠加有共模干扰；现有的几种利用仪用放大器的压电信号前置放大电路解决方案有一些不足。在理论分析的基础上，对压电信号前置放大电路做了重要改进，提出了具有共模电压并联负反馈电路的压电信号放大电路前置级方案。实验显示，该方案能有效抑制共模干扰、提高电路的信噪比。
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| 关 键 词： | 超声 压电信号 仪用放大器 共模干扰 |
Design of Pre-amplifier in Piezoelectric Signal Acquisition |
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| SHI Rui-chao,LIU Hong-xing,YU Jian,BAI Zhi-ping. Design of Pre-amplifier in Piezoelectric Signal Acquisition[J]. Modern Electronic Technique, 2011, 34(10): 179-181 |
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| Authors: | SHI Rui-chao LIU Hong-xing YU Jian BAI Zhi-ping |
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| Affiliation: | SHI Rui-chao,LIU Hong-xing,YU Jian,BAI Zhi-ping(School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China) |
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| Abstract: | Signal from piezoelectric sensor is weak and often mixed with common-mode interference.The current schemes for piezoelectric signal pre-amplifiers based on instrument amplifier always appear some problems.On basis of theoretical analysis,an improved scheme for the piezoelectric signal pre-amplifier is proposed.A prestage scheme of piezoelectric signal amplifier about voltage-parallel connection negative feedback circuit with common-mode interference attenuation is proposed.The experiment indicates that the ... |
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| Keywords: | ultrasonic sound piezoelectric signal instrument amplifier common-mode interference |
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