Method for analyzing influences of grounding hole on signal integrity on basis of FDTD algorithm

A technology of signal integrity and algorithm analysis, applied in computing, CAD circuit design, special data processing applications, etc., can solve problems such as complex manufacturing process and high cost, and achieve the effects of enhancing reliability, improving comprehensiveness, and ensuring stability

Inactive Publication Date: 2017-10-20
ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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Problems solved by technology

Through holes pass through the entire circuit board and can be used to achieve internal interconnection or as mounting and positioning holes for components; blind holes, buried holes and micro holes are

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  • Method for analyzing influences of grounding hole on signal integrity on basis of FDTD algorithm
  • Method for analyzing influences of grounding hole on signal integrity on basis of FDTD algorithm
  • Method for analyzing influences of grounding hole on signal integrity on basis of FDTD algorithm

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Embodiment Construction

[0041] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...

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Abstract

The invention discloses a method for analyzing influences of a grounding hole on signal integrity on the basis of the FDTD algorithm. The method comprises the following steps that firstly, a signal conversion layer is divided into different reference planes according to specific circumstances of a high-speed signal conversion layer; secondly, an equivalent pi model is established according to analysis of a signal through hole structure; thirdly, the grounding hole is analyzed through the FDTD algorithm; fourthly, by means of the S parameter extracted through HFSS simulation software and a two-port network of the equivalent pi model, the parasitic parameters of the through hole in the 3 GHz range is calculated; fifthly, an FDTD calculation result and an HFSS simulation result are analyzed and compared; sixthly, the S parameter and a time domain response continue to be compared under the condition that the grounding hole exists or does not exist, and the improvement effect of the grounding hole on the signal integrity is determined. The influence of the grounding hole on the signal integrity is accurately judged, and the mutual influence of signals between the signal conversion layer of a PCB and the grounding hole is greatly reduced.

Description

technical field [0001] The invention relates to a method for analyzing the influence of a grounding hole on signal integrity based on an FDTD algorithm, and belongs to the technical field of server PCB circuit boards. Background technique [0002] FDTD is receiving more and more attention due to its characteristics of direct time-domain calculation, wide applicability, saving storage space and calculation suitable for parallel computing and the generality of calculation programs, and is gradually applied to practical problems. The accuracy of full-wave electromagnetic analysis can be combined with the rapidity of circuit analysis. After using the FDTD full-wave electromagnetic method to extract frequency-varying parameters, it can be transformed into a variety of circuit analysis methods for high-speed interconnection analysis. FDTD is an explicit difference algorithm, which calculates the change law of the electromagnetic field in the calculation space according to the time...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/39
Inventor 刘法志王林
Owner ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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