吉林大学学报(信息科学版) ›› 2020, Vol. 38 ›› Issue (3): 280-285.

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基于压频转换的相敏检波器

刘文杰,李宝华   

  1. 吉林大学电子科学与工程学院,长春130012
  • 收稿日期:2019-11-18 出版日期:2020-05-24 发布日期:2020-06-24
  • 作者简介:刘文杰( 1995— ) ,女,浙江丽水人,吉林大学硕士研究生,主要从事应用电子技术研究,( Tel) 86-18843015512( E-mail)liuwj123123@163. com; 李宝华( 1962— ) ,男,长春人,吉林大学教授,硕士生导师,主要应用电子技术研究,( Tel) 86-13180801233( E-mail) libh@ mail. jlu. edu. cn。
  • 基金资助:
    吉林省科技发展计划基金资助项目( 20190302010GX)

Phase Sensitive Detector Based on Voltage-Frequency Conversion

LIU Wenjie,LI Baohua   

  1. College of Electronic Science and Engineering,Jilin University,Changchun 130012,China
  • Received:2019-11-18 Online:2020-05-24 Published:2020-06-24

摘要: 为了实现对微弱信号的检测,提出了一种基于压频转换的相敏检波器。利用压频转换电路,将被测信号
中的模拟电压值转换成频率,使用单片机根据参考信号对转换后的频率信号进行计数和数字滤波,从而实现小
信号检测。分析了相关检测原理,完成了系统的软硬件设计与实现,并进行了验证实验及误差分析,结果验证
了本方案的正确性和可行性。该系统原理简单、成本低廉、可靠性强、方便实用,在微弱信号检测上具有广阔
的应用前景。

关键词: 相敏检波, 压频转换, 微弱信号检测, 滤波

Abstract: In order to detect weak signal,a phase sensitive detector based on voltage frequency conversion is
proposed. The voltage to be measured is converted into frequency through the voltage frequency conversion
circuit,and the frequency signal is counted and digital filtered by the single-chip microcomputer according to the
reference signal,so as to realize weak signal detection. The related detection principle is analyzed,the hardware
and software design and implementation of the system are completed,the verification experiment and error
analysis are carried out,and the correctness and feasibility of the scheme are verified. The system is simple in
principle,low in cost,reliable,convenient and practical,and has a broad application prospect in weak signal
detection.

Key words: phase sensitive detection, voltage frequency conversion, weak signal detection, filter

中图分类号: 

  • TP274