一种数字电路电磁传导发射多源模型提取方法

This paper proposes a multi-source model extraction method based on electromagnetic interference element theory to solve the modeling problem of digital circuit electromagnetic conducted emission. Based on the basic emission waveform theory, this paper divides the digital circuit electromagnetic conducted emission model into two parts: basic elements and extended elements. In view of the characteristics of digital circuit clock signals, the trapezoidal pulse sequence is selected as the basic element form, and an improved joint estimation algorithm is proposed to extract the basic element parameters and the corresponding extended element system transfer function model. Aimed at the coexistence of multiple sources of digital circuits, a multi-source identification and separation method based on autocorrelation function is proposed to separate different basic elements from a set of test data, and finally complete the modeling of electromagnetic conducted emission of digital circuits. The simulation and experimental results verify the feasibility and accuracy of the proposed method.