Analysis and Reduction of Coupling Noise in Embedded Wideband Data Acquisition System

This paper investigates the coupling noise in embedded wideband data acquisition system that has low signal integrity and power integrity performance. The study firstly designs a set of experiments to characterize and quantify the source and the coupling of the interference signals, such as nearfield measurement and power noise measurement in frequency domain. Secondly, with the help of the full-wave simulation, the paper reveals the inter-layer coupling paths. Finally, based on the results of measurement and simulation analysis, the PCB layout of the embedded system is modified and the performance of the signal integrity is improved. Moreover, the measurement results show that most of the coupling noise is reduced significantly.