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Line impedance adjusting method and system

A line impedance and adjustment system technology, which is applied in printed circuit, printed circuit, printed circuit manufacturing, etc., can solve problems such as strong signal reflection

Active Publication Date: 2017-04-26
ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of impedance discontinuities, if the line impedance is only set according to the signal type, such as setting a 100ohm line impedance for the SAS signal, etc., the signal reflection will often be strong

Method used

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  • Line impedance adjusting method and system
  • Line impedance adjusting method and system

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Embodiment Construction

[0065] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0066] Such as figure 1 As shown, the embodiment of the present invention provides a line impedance adjustment method, the method may include the following steps:

[0067] Step 101: matching at least two test impedances for each type of signal in advance;

[0068] Step 102: Determine the signal type of the transmission line pre-transmission signal;

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Abstract

The invention provides a line impedance adjusting method and system wherein the method comprises the following steps: based on the signal type of the pre-transmission signal of a transmission line, determining at least two target test impedances corresponding to the signal type of the pre-transmission signal; using a simulation device to conduct simulation analysis on the wire distribution models corresponding to each target test impedance; and based on the simulation analysis result, determining the line impedance corresponding to the transmission line. According to the invention, the existence of non-continuous impedance points in the transmission line is considered so that it is possible to determine a plurality of target test impedances for each type of signal; and based on simulation analysis, the target test impedance with the best signal transmission quality is screened out as the line impedance of the transmission line. Compared with the prior art, the method of the invention reduces the reflection intensity of a signal and increases the signal transmission quality.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a line impedance adjustment method and system. Background technique [0002] At a certain frequency, the signal is transmitted between the sending end (such as: CPU) and the receiving end (such as: hard disk) on the circuit board. Relative to a certain reference layer on the circuit board, the signal is affected by the transmission line during transmission. The resistance is called impedance. [0003] Different types of signals have different impedance requirements for transmission lines. For example, the SAS signal impedance requirement is 100ohm, and the PCIE signal impedance requirement is 85ohm. When designing the impedance of the transmission line, we will strive to keep the impedance of all nodes consistent. For example, the SAS signal is output from the CPU, passes through capacitors, connectors, cables, and reaches the hard disk. The impedance is kept at 100o...

Claims

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Application Information

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IPC IPC(8): H05K3/00
CPCH05K3/0005H05K2201/09218
Inventor 孙龙李永翠
Owner ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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