Journal of Engineering Research

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.

Impedance matching; Noise suppression; Electronic measuring instruments; Signal integrity; Front-end circuit