一种数字电路电磁传导发射多源模型提取方法

A multi-source model extraction method of digital circuit conducted emission

基于电磁干扰要素理论,提出一种数字电路电磁传导发射多源模型提取方法,用于解决数字电路电磁传导发射的建模问题。以电磁干扰要素理论为出发,综合考虑数字电路模块特点,将数字电路电磁传导发射模型划分为若干基本要素和扩展要素。针对数字电路时钟信号特征,选取梯形脉冲序列为基本要素形式,提出一种改进的联合估计算法用于提取基本要素参数及对应扩展要素系统传递函数模型;针对数字电路多源共存的情况,提出一种基于自相关函数的多源辨识分离方法,从而实现从一组测试数据中识别出多个基本要素及对应扩展要素,并最终完成数字电路电磁传导发射的建模。仿真及实验结果验证了所提方法的可行性和准确性。

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.