CN103970951A - Method for fitting material loss angle - Google Patents

Abstract

The invention provides a method for fitting a material loss angle. The method comprises the steps of adding a small test board on a designed singe board; performing test on the test board to obtain an impedance graph, a loss graph and a result; performing physical slicing on the test board to obtain true board layer information; performing computing through a formula to obtain a permittivity of a material; obtaining the loss angle through a simulation method, establishing a transmission line model by means of data of the physical slicing, fitting transmission line model with the tested loss, and fitting simulated data with the tested data by changing the loss angles continuously until the simulated data and the tested data are consistent completely, wherein the obtained loss angle is the loss angle of the corresponding material. Compared with the prior art, the accurate permittivity and the accurate loss angle can be obtained, the obtained value is accurate and small in error, and strong practicability is achieved.

Description

The method at a kind of matching spillage of material angle

Technical field

The present invention relates to electronic technology field, specifically a kind of method at matching spillage of material angle in pcb board design process.

Background technology

In the modern high-speed figure world, the signal integrity simulation link that is absolutely necessary.The levels of precision of the levels of precision of emulation and the foundation of model is indivisible.How to set up accurately realistic model, the specific inductive capacity of material therefor and the degree of accuracy of loss angle are very important.The specific inductive capacity that producer takes and loss angle are all generally independent materials itself, but along with the pressing of pcb board and the mixing of veriform material are used, make this parameter have variation.Can so how just obtain accurate specific inductive capacity and loss angle? based on this, now provide one can obtain accurate some general knowledge and the loss angle of borrowing.

Summary of the invention

Technical assignment of the present invention is to solve the deficiencies in the prior art, and the method at a kind of matching spillage of material angle is provided.

Technical scheme of the present invention realizes in the following manner, the method at this kind of matching spillage of material angle, and its specific implementation process is:

First, on the veneer of design, add little test board;

Then test board is tested, obtained impedance diagram and loss figure and result;

Then test board is carried out to physics section, obtain real flaggy information;

Calculate the specific inductive capacity of material by formula;

Method by emulation obtains loss angle, use the data of physics section to set up transmission line model, and the loss of test carries out matching, come Curve fitting simulation data and test data by continuous variation loss angle, until in full accord, the loss angle obtaining is like this exactly the loss angle of respective material.

The beneficial effect that the present invention compared with prior art produced is:

The method at a kind of matching spillage of material of the present invention angle can obtain accurate some general knowledge and the loss angle of borrowing, and the numerical value obtaining is accurate, and error is less, practical, is easy to promote.

Brief description of the drawings

Accompanying drawing 1 is impedance computation formula figure of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the method at a kind of matching spillage of material of the present invention angle is described in detail below.

The method at this kind of matching spillage of material angle, its specific implementation process is:

First, need on the veneer of design, add little test board.

Then test board is tested, obtained impedance diagram and loss figure and result.

Then test board is carried out to physics section, obtain real flaggy information.

Calculate the specific inductive capacity of material by formula, this computing formula as shown in Figure 1.

Method by emulation obtains loss angle, use the data of physics section to set up transmission line model, and the loss of test carries out matching, come Curve fitting simulation data and test data by continuous variation loss angle, until in full accord, the loss angle obtaining is like this exactly the loss angle of respective material.

The foregoing is only embodiments of the invention, within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (1)

1. the method at matching spillage of material angle, is characterized in that its specific implementation process is:

First, on the veneer of design, add little test board;

Then test board is tested, obtained impedance diagram and loss figure and result;

Then test board is carried out to physics section, obtain real flaggy information;

Calculate the specific inductive capacity of material by formula;

Method by emulation obtains loss angle, use the data of physics section to set up transmission line model, and the loss of test carries out matching, come Curve fitting simulation data and test data by continuous variation loss angle, until in full accord, the loss angle obtaining is like this exactly the loss angle of respective material.