开关噪声抑制方法研究

发布时间：2018-06-08 08:24

本文选题：同步开关噪声 + 电源分配网络　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：随着现代电子产品功能不断强大、复杂度不断提升、功耗不断减小,电子产品工作时钟频率将变得更快,供电电压将变得更小,相应的电路设计所允许的噪声容限、时序容限也将变得更低。大规模集成电路内部晶体管同时开启将产生陡变的瞬态电流,由陡变瞬态电流引起的同步开关噪声将严重影响电源分配网络。电源分配网络是高速电路设计的核心,电路中所有器件都将连接到电源分配网络。电源分配网络设计的科学与否,决定整个产品设计的成败。同步开关噪声抑制作为电源分配网络设计的重要一环,使得在高速电路中抑制同步开关噪声变得尤为重要。过去,同步开关噪声得到了足够的重视,研究者提出了多种能抑制同步开关噪声传播的方法,其中大多数方法在有限的频带内是有效的。本文的工作致力于研究在电源分配网络中如何有效消除同步开关噪声的影响。文章在信号完整性理论基础上,分析电源分配网络的噪声来源,阐述同步开关噪声形成机理,并根据其形成机理提出几类抑制同步开关噪声的传统电源分配网络设计,例如增加分立去耦电容、采用差分线传输信号、分割电源平面等,并分析这些方法的优缺点。近年来,出现了一种电磁带隙结构用于抑制同步开关噪声,这种方法相比传统电源分配网络设计有很大改进。本文重点介绍电磁带隙结构抑制同步开关噪声,从蘑菇型电磁带隙结构和共面型电磁带隙结构入手,通过理论推导和软件仿真阐述电磁带隙结构抑制同步开关噪声的机理。电磁带隙结构发展迅速,国内外众多研究者提出多种电磁带隙结构用于抑制同步开关噪声。针对这些电磁带隙结构,本文剖析其中的优点和不足,并总结前人的经验,创新性地提出了一种平面级联型电磁带隙结构。该结构属于共面型电磁带隙结构,它由两种不同周期的共面型结构基本单元按照一定的规则组合而成。由于其级联特征,新型平面级联电磁带隙结构能同时继承这两种电磁带隙结构的优点,如果将低下截止频率和超宽带抑制能力的两种电磁带隙结构级联,便能得到全频带抑制带宽的电磁带隙结构。文章详细的介绍平面级联型电磁带隙结构的实现过程,通过仿真验证,在-30d B的抑制深度下,采用该结构将具有19.6GHz的抑制带宽和500MHz的下截止频率,相比由单一基本单元组成的电磁带隙结构,其抑制效果要好。另外,本文对该结构进行等效电路建模,从LC并联谐振电路角度分析该结构的阻带特性,并阐述该结构所具有的继承性。最后,对该结构进行时域眼图分析,在采用差分信令情况下,信号传输质量可以得到明显改善。
[Abstract]:With the powerful functions, increasing complexity and decreasing power consumption of modern electronic products, the clock frequency of electronic products will become faster, the power supply voltage will become smaller, and the noise tolerance of the corresponding circuit design will be allowed. Timing tolerances will also become lower. Switching on the internal transistor of large scale integrated circuits at the same time will result in a sudden change of transient current, and the synchronous switching noise caused by the sudden change of transient current will seriously affect the power distribution network. Power distribution network is the core of high-speed circuit design, all devices in the circuit will be connected to the power distribution network. Whether the power distribution network design is scientific or not determines the success or failure of the whole product design. As an important link in the design of power distribution networks, the suppression of synchronous switching noise in high-speed circuits becomes particularly important. In the past, enough attention has been paid to synchronous switching noise. Researchers have proposed a variety of methods to suppress the propagation of synchronous switching noise, most of which are effective in a limited frequency band. This paper focuses on how to effectively eliminate the influence of synchronous switching noise in power distribution networks. Based on the theory of signal integrity, this paper analyzes the noise source of power supply distribution network, expounds the formation mechanism of synchronous switching noise, and puts forward several kinds of traditional power distribution network design for restraining synchronous switching noise according to its formation mechanism. The advantages and disadvantages of these methods are analyzed, such as increasing the discrete decoupling capacitance, using differential line to transmit the signal, dividing the power plane, and analyzing the advantages and disadvantages of these methods. In recent years, an electromagnetic bandgap structure has been developed to suppress the synchronous switching noise. This method is much better than the traditional power distribution network design. This paper focuses on the suppression of synchronous switching noise by electromagnetic band gap structure. Starting with mushroom electromagnetic band gap structure and coplanar electromagnetic band gap structure, the mechanism of electromagnetic band gap structure restraining synchronous switching noise is explained by theoretical derivation and software simulation. With the rapid development of electromagnetic bandgap structures, many researchers at home and abroad have proposed a variety of electromagnetic band gap structures to suppress synchronous switching noise. In this paper, the advantages and disadvantages of these electromagnetic band gap structures are analyzed, and the previous experiences are summarized. A plane cascade electromagnetic band gap structure is proposed in this paper. The structure belongs to the coplanar electromagnetic band gap structure and is composed of two basic elements of coplanar structure with different periods in accordance with certain rules. Because of its cascade characteristics, the new planar cascade electromagnetic band gap structure can inherit the advantages of these two electromagnetic band gap structures at the same time. If two kinds of electromagnetic band gap structures with low cutoff frequency and ultra-wideband suppression ability are cascaded, An electromagnetic bandgap structure with full bandwidth suppression can be obtained. In this paper, the realization process of planar cascaded electromagnetic bandgap structure is introduced in detail. The simulation results show that the structure will have a bandwidth of 19.6GHz and a lower cut-off frequency of 500MHz at the depth of -30dB. Compared with the electromagnetic band gap structure composed of a single basic unit, the suppression effect of the structure is better. In addition, the equivalent circuit of the structure is modeled, the stopband characteristic of the structure is analyzed from the point of view of LC parallel resonant circuit, and the inheritance of the structure is expounded. Finally, the time domain ophthalmogram analysis of the structure shows that the signal transmission quality can be improved obviously by using differential signaling.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86

【共引文献】