| 一种带移相功能的锁相放大电路设计及仿真 |
| Design and Simulation of a Lock-in Amplifier with Phase-shift Function |
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| 中文摘要: |
| 介绍了一种带移相功能的锁相放大电路的设计及仿真，可应用于从噪声中提取微弱信号的领域。锁相放大技术与窄带滤波相似，包括相敏检波和低通滤波，该电路基于相敏检波芯片AD630，并设计0°~360°移相电路，可调节相位保证输入信号与参考信号相位一致，得到输出最大值，经过仿真试验验证，该锁相放大电路可从1000倍的噪声中提取有效信号。 |
| 英文摘要: |
| This paper presents the design and simulation of a lock-in amplifier(LIA) together with phase-shift function, applying in processing small signals buried in noises. A lock-in amplifier is equivalent to a narrow-band filter. It consists basically a phase sensitive detector followed by a low-pass filter. We designed the circuit based on the phase-sensitive detector AD630, together with a phase-shift circuit which can make the phase of reference signals coordinate with the phase of input signals. Simulation experiments verified the LIA can exstract useful signal from a noise signal approximately 1000 times in amplitude. |
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| 中文关键词: 锁相放大 移相 AD630芯片 |
| 英文关键词:lock-in amplifier (LIA) phase-shift AD630 |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2020.05.04 |
| 引用本文：李丹，张学聪，蔡静.一种带移相功能的锁相放大电路设计及仿真[J].计测技术,2020,(5):. |
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