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Simulation methods and simulation equipment

A simulation method and technology of simulation equipment, applied in the direction of CAD circuit design, computer design circuit, instrument, etc., can solve the problems of propagation delay time difference between lines, noise elimination rate decline, etc., and achieve the effect of suppressing calculation cost

Inactive Publication Date: 2017-07-14
FUJITSU LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, a difference in propagation delay time between lines (skew: skew) occurs, and the common noise cancellation rate decreases

Method used

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  • Simulation methods and simulation equipment
  • Simulation methods and simulation equipment
  • Simulation methods and simulation equipment

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Embodiment Construction

[0029] The simulation method, simulation device, and computer-readable recording medium storing therein a simulation program for causing a computer to execute simulation processing according to the present embodiment will be described below with reference to the accompanying drawings.

[0030] The analog device according to this embodiment simulates signal propagation in the wiring board (especially analyzing the propagation delay time difference (skew) that occurs between the differential lines of the wiring board for high-speed transmission using glass cloth) Simulate equipment.

[0031] Figure 14 It is a schematic diagram of the glass cloth constituting the high-speed transmission wiring board.

[0032] Such as Figure 14 As shown in the figure, the glass cloth 11 is formed by plane weaving the glass fiber bundles 12 juxtaposed in the direction parallel to the X axis and the glass fiber bundles 13 juxtaposed in the direction parallel to the Y axis in a lattice shape. Here, the g...

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Abstract

Three-dimensional electromagnetic field analysis is performed for a plurality of positional patterns of a first wiring board internal structure model including one glass cloth on the upper side of differential lines and also for a plurality of positional patterns of a second wiring board internal structure model including one glass cloth on the lower side of differential lines to calculate skews, and the calculated skews are summed relating to a plurality of wiring board patterns configured by combining a plurality of combination patterns obtained by combining the plurality of positional patterns of the first model and a plurality of combination patterns obtained by combining the plurality of positional patterns of the second model to calculate a total skew and then a skew distribution in a wiring board having a certain line length is acquired based on the total skew.

Description

Technical field [0001] The embodiments disclosed herein relate to simulation methods and simulation devices. Background technique [0002] As the signal transmission speed in electronic equipment increases, differential transmission is generally used as a technique to compensate for the decrease in the S / N ratio caused by the increase in transmission loss. In the differential transmission, two lines including the P line and the N line are used as a set and signals having phases opposite to each other are transmitted therein. As a result, common noise with substantially the same phase appears on the two lines on the receiving side. The common noise is eliminated by taking the difference of the signals. Thereby the S / N ratio can be improved. [0003] For example, in a wiring board including glass cloth and differential wires, the dielectric constant of glass cloth is generally higher than that of resin. Therefore, the propagation delay is small in a region where the amount of glas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/39H05K1/0245H05K1/0248H05K1/0366H05K3/0005H05K2201/029
Inventor 长冈秀明福盛大雅水谷大辅
Owner FUJITSU LTD