Front-end noise suppression method for electronic measuring instruments based on impedance matching circuit
基于阻抗匹配电路的电子测量仪器前端噪声抑制方法

摘要

电子测量仪器在信号采集过程中易受前端噪声干扰，影响测量精度与稳定性。本文围绕基于阻抗匹配电路的噪声抑制方法展开研究，提出通过优化输入端口阻抗匹配结构，以降低噪声耦合路径并提升信噪比。分析了噪声来源及其对测量系统的影响机制，并设计了一种适用于高频信号输入环境的阻抗匹配网络。实验结果表明，该方法能有效抑制前端噪声，显著提升测量精度和系统稳定性，为高精度电子测量设备的设计提供理论依据与实现路径。

Abstract

Electronic measuring instruments are prone to front-end noise interference during signal acquisition, affecting measurement accuracy and stability. This paper focuses on the research of noise suppression methods based on impedance matching circuits, proposing to optimize the impedance matching structure of the input port to reduce noise coupling paths and improve the signal-to-noise ratio. The noise sources and their influence mechanisms on the measurement system are analyzed, and an impedance matching network suitable for high-frequency signal input environments is designed. Experimental results show that this method can effectively suppress front-end noise, significantly improve measurement accuracy and system stability, providing a theoretical basis and implementation path for the design of high-precision electronic measuring equipment.