【作者】 孙伟；

【导师】 李晓春；

【作者基本信息】 上海交通大学 ， 电子科学与技术， 2018， 硕士

【摘要】 随着电路工作频率的不断提高和系统供电电压的不断下降,由于同步开关噪声(synchronous switching noise,SSN)和电压降引起的电源完整性问题已成为高速电路中电源配送网络设计的重要环节。由于高速电路中电源的不稳定供电可能会给系统正常工作带来致命的影响,因此有必要对高速电路系统中的电源完整性进行分析。同时,高频工作下的电路会产生电磁辐射,随之产生的电磁干扰(Electromagnetic Interference,EMI)会对整个电路系统的稳定工作产生严重影响,因此有必要对高速电路中的电磁干扰进行测量和分析。论文主要工作包括两个方面:一、为了分析电源配送网络中电源地平面部分的电源完整性问题,本文提出了一种基于加权拉盖尔多项式-时域有限差分(Weighted Laguerre Polynomials Finite-Difference Time-domain,WLP-FDTD)的数值方法。论文首先对电源地平面建立等效模型,将三维问题简化成二维问题,求解噪声在平面中的传播,并且由于电源地平面中常存在间隙结构,基于路的模型,将平面分成两部分,一部分为完整电源地平面,另一部分为间隙结构,然后建立完整电源地平面等效电路模型以及间隙的耦合电路模型,最后对等效电路建立电压电流方程,并采用WLP-FDTD算法求解。与传统的基于时域有限差分(Finite-Difference Time-domain,FDTD)的分析方法相比较,论文提出的基于WLP-FDTD的电源完整性分析方法消除了稳定性约束条件,在精度不变的情况下计算效率显著提高,适合高效精确地分析高速电路的电源完整性问题。二、电磁近场扫描因其测量精度高,使用灵活等特点,如今被广泛应用于表征印制电路板(Printed Circuit Board,PCB)电磁场的空间分布。本文基于近场扫描系统,采集微带天线上方磁场空间分布,分析微波器件表面场的感应情况,将测试的结果与仿真的结果进行了比较与分析,并利用近场扫描建立等效模型。更多还原

【Abstract】 With the continuous increasing of the working frequency of the circuit and the continuous decreasing of the system supply voltage,the power integrity problem due to the synchronous switching noise(SSN)and the voltage drop has become an essential part in the power distribution network design.The fluctuation of the power supply will influence the stability of the high-speed circuit.Therefore,it is very necessary to analyze the power integrity of high-speed circuits.Besides,the circuits working at highfrequency will generate electromagnetic near-field radiation,which will result in Electromagnetic Interference(EMI)and seriously damage the performance of the entire circuit system.Therefore,it is very necessary to measure and analyze the electromagnetic near-field induction in high-speed circuit system.The main work of this thesis includes two aspects:A numerical method based on weighted Laguerre polynomials finitedifference time-domain(WLP-FDTD)is proposed to analyze power integrity problem of power and ground planes in power delivery network.Firstly,the planes are modeled as a 2-D structure and then are used to analyze the noise propagating problem.To analyze power/ground planes with slots,the planes are divided into two parts,one is the planes,and the other is the slots.Then the planes are modeled as 2D equivalent circuit networks and the slots are modeled as coupled circuits.Finally,the equivalent 2D circuits are solved by WLP-FDTD.Numerical results show that the WLP-FDTD-based method can achieve higher efficiency than the traditional finite-difference time-domain(FDTD)method with the same accuracy.Therefore,the proposed WLP-FDTD-based method is suitable for accurate and efficient analysis of power integrity problem in high-speed circuits.Near-field scanning,with the advantage of high accuracy and flexibility,is now widely used in measuring the electromagnetic distribution of printed circuit board.This paper mainly applies the near-field scanning system to extract the distribution of electromagnetic of microstrip antenna and analyzes the surface induction of the circuits.The simulated results and measured results are compared and the difference is analyzed and the equivalent model is established with the near-field scanning.更多还原