CN102456086A - Method for optimized evaluation of parameter influencing circuit board signal transmission quality - Google Patents
Method for optimized evaluation of parameter influencing circuit board signal transmission quality Download PDFInfo
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- CN102456086A CN102456086A CN2010105284980A CN201010528498A CN102456086A CN 102456086 A CN102456086 A CN 102456086A CN 2010105284980 A CN2010105284980 A CN 2010105284980A CN 201010528498 A CN201010528498 A CN 201010528498A CN 102456086 A CN102456086 A CN 102456086A
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Abstract
The invention provides a method for the optimized evaluation of a parameter influencing circuit board signal transmission quality. The method comprises the following steps of: establishing a first experimental design table of few experiment times, and obtaining eye diagram heights of each group of experiments in the first experimental design table through simulation experiments; and then fitting the empirical formula of the eye diagram heights through a mathematical regression algorithm according to the eye diagram heights. The method also comprises the steps of: establishing a second experimental design table by a full-factorial experiment method; calculating the eye diagram heights of each group of experiments in the second experimental design table according to the fitted formula; and selecting a plurality of groups of experiments each having the eye diagram height greater than 1 from the second experimental design table. The method further comprises the steps of calculating the average value of the eye diagram heights of each group of experiments among the plurality of groups of experiments selected and taking the values of m variables in the group of experiments having the maximal average value as the optimized values of the m variables. The method determines the optimized value of the parameter influencing the circuit board signal transmission quality by the experimental design method, thus facilitating more accurate and steady circuit board design.
Description
Technical field
The present invention relates to the design field of circuit board, especially a kind of parameter optimization obtaining value method that influences the circuit board signal transmission quality.
Background technology
Quality is the key factor that electronics manufacturer keeps its market competitiveness, and the quality of electronic product often just can roughly determine in its initial design phase.Circuit board (print circuit board claims pcb board again) is the chief component of electronic product, and its design often directly influences the reliability and stability of signal transmission in the electronic product.Therefore, the design of circuit board plays an important role to the quality of electronic product.
In the design of circuit board, the length of each line segment that connects up, wiring layer are not, parameter such as each transmission line characteristic impedance all can influence the quality of signal transmission, thereby cause the reduction of electronic product quality.
Summary of the invention
In view of above content; Be necessary to propose a kind of parameter optimization obtaining value method that influences the circuit board signal transmission quality; It is through the definite optimization of parameters value that influences the circuit board signal transmission quality of method of experimental design, to carry out more accurately sane board design.
A kind of parameter optimization obtaining value method that influences the circuit board signal transmission quality comprises: m the parameter that influences certain parameter of circuit board signal transmission quality on the acquisition cuicuit plate in P components and parts; Each parameter in the above-mentioned m parameter is provided with n value; N value according to each parameter in this m parameter makes up the first experimental design table; Carry out simulated experiment according to the above-mentioned first experimental design table, test a resulting P eye height for every group that writes down in this first experimental design table; According to every group of P eye height that experiment obtains in the above-mentioned first experiment table, utilize a preset model formation, carry out regression Calculation through mathematical algorithm, simulate the experimental formula of P eye height; An above-mentioned m parameter is provided with the individual value of n ', and wherein, n ' is greater than n; The individual value of n ' according to each parameter in this m parameter makes up the second experimental design table; Utilize the experimental formula of P the eye height that above-mentioned match comes out, every group of experiment in this second experimental design table calculated, calculate P eye height of every group of experiment; P eye height of every group of experiment of coming out according to aforementioned calculation filters out P eye height all greater than 1 some groups of experiments from the second experimental design table; Calculate the mean value of P eye height of every group of experiment in this some groups of screening experiment; And pick out that maximum group experiment of mean value of being calculated, the value of m parameter during this group is tested is as the optimized value of this m parameter.
The parameter optimization obtaining value method that influences the circuit board signal transmission quality provided by the present invention confirms to influence the optimization of parameters value of circuit board signal transmission quality through method of experimental design; To carry out more accurately sane board design, the number of times of its experiment is few and efficient is high.In addition, this method can be carried out the value of parameter optimization simultaneously to a plurality of components and parts on the circuit board.
Description of drawings
Figure 1A-Figure 1B has demonstrated 4 parameters of the wiring line segment length of 9 internal memories and 3 kinds of values of each parameter on the circuit board for example.
Fig. 2 is the implementing procedure figure that the present invention influences the parameter optimization obtaining value method preferred embodiment of circuit board signal transmission quality.
Fig. 3 A-Fig. 3 B has demonstrated the first experimental design table that utilizes the reaction Surface Method to make up for example.
Fig. 4 has demonstrated every group of P eye height of testing that the first experimental design table is experimentized and obtains for example.
The experimental formula of P the eye height that the eye height that Fig. 5 A-Fig. 5 B has demonstrated a preset model formation for example and utilized this model formation to obtain according to Fig. 4 simulates.
Fig. 6 A-Fig. 6 B has demonstrated the second experimental design table that utilizes the total divisor experimental method to make up for example.
Fig. 7 has demonstrated the experimental formula of P the eye height that utilizes match among Fig. 5 for example to every group in the second experimental design table of Fig. 6 P eye height of testing the every group of experiment that calculates.
Fig. 8 has demonstrated P signal eye diagram height all greater than the screenings of 1 some groups experiments for example.
Fig. 9 has demonstrated confirming the parameter optimization value for example.
Embodiment
The parameter optimization obtaining value method that influences the circuit board signal transmission quality according to the invention is all or part ofly to be the basis with the computer programs process flow process; Carry out computer program through computing machine, the solution that the computing machine external data is controlled or handled by above-mentioned flow process establishment.
The length, wiring layer that the parameter that influences the circuit board signal transmission quality possibly comprise the line segment that respectively connects up not, each transmission line characteristic impedance etc.Below; Present embodiment is with shown in Figure 1A; 4 parameter A, B, C, the D of the wiring line segment length of a plurality of internal memory D0～D8 is example on the circuit board; Cooperate Fig. 2 to Fig. 9, introduce the parameter optimization value that the present invention influences the circuit board signal transmission quality, i.e. the solution of the optimization obtaining value method of parameter A, B, C, D.
Consulting shown in Figure 2ly, is the implementing procedure figure that the present invention influences the parameter optimization obtaining value method preferred embodiment of circuit board signal transmission quality.
Step S10 influences m parameter of certain parameter of circuit board signal transmission quality in P components and parts on the acquisition cuicuit plate.In the present embodiment, shown in Figure 1A, a said P components and parts are meant 9 internal memory D0～D8, and said m the parameter that influences the parameter of circuit board signal transmission quality is meant 4 kinds of parameter A, B, C, the D of the wiring line segment length of internal memory D0～D8 shown in Figure 1.
Step S11 is provided with n kind value with each parameter in the above-mentioned m parameter.In the present embodiment, shown in Figure 1B, the n of said each a parameter value is set to " 1 " respectively, " 0 " reaches " 1 " three kinds, reaches " 2000 " three kinds of values like " 3000 ", " 2500 " of length A.
Step S12 utilizes the reaction Surface Method, and the n kind value that accordings to each parameter in this m parameter makes up the first experimental design table.Shown in Fig. 3 A; Said reaction Surface Method be with wherein three parameters in m the parameter be three axially; Make up a cube,, make up the first experimental design table shown in Fig. 3 B according to the central point value of the mid point and/or the square on the summit of square, 12 limits.
Step S13 carries out simulated experiment according to the above-mentioned first experimental design table, tests a resulting P eye height for every group that writes down in this first experimental design table.Said eye pattern is the figure of being overlapped and being formed by many signal waveforms, the shape of its shape similar " eye "." eye " is big, and promptly eye height is big, and then the expression signal transmission quality is good, and " eye " is little, and promptly eye height is little, in the process of expression signal transmission interference is arranged.Should understand, a said P eye height is respectively the eye height of P signal that components and parts produce on the circuit board.EH0～EH8 that the P that said experiment an obtains eye height is as shown in Figure 4.
Step S14, P eye height according to every group in above-mentioned first experiment table experiment obtains utilizes a preset model formation, carries out regression Calculation through mathematical algorithm, simulates the experimental formula of P eye height.Said preset model formation is referring to shown in Fig. 5 A.In this model formation, b
0～bm
+ 1Be coefficient, A, B, C, D are meant 4 parameters of the wiring line segment length of above-mentioned internal memory D0～D8.It is said that to carry out experimental formula that regression Calculation simulates P eye height through mathematical algorithm be through calculating P group shown in Fig. 5 B (b of EH0～EH8)
0～b
M+1Value, thereby obtain the formula of P group eye height.For example, according to the b that calculates
0～b
M+1, on the circuit board the 4th components and parts (like internal memory D3) the eye height of generation signal, promptly the experimental formula of EH3 is:
EH＝0.902431-0.00188A-0.0121B-0.04209C-0.00144D+0.090599A
2+0.014949B
2-0.0042C
2-0.0024D
2+0.004613AB+0.007087AC+0.001375AD+0.010163BC-0.00073BD+0.001975CD+e。
Step S15 is provided with n ' with an above-mentioned m parameter and plants value, and wherein, n ' is greater than n.As stated, said each parameter is set to " 1 " respectively, " 0 " reaches " 1 " three kinds of values, reaches " 2000 " three kinds of values like " 3000 ", " 2500 " of length A.Therefore; In the present embodiment; Shown in Fig. 6 A, said each parameter is set to " 1 ", " 0.5 ", " 0 " respectively, " 0.5 " reaches " 1 " five kinds of values, reaches " 2000 " five kinds of values like " 3000 ", " 2750 ", " 2500 ", " 2250 " of length A.
Step S16 utilizes the total divisor experimental method, and n ' the kind value according to each parameter in this m parameter makes up the second experimental design table.Said total divisor experimental method is the method that all states with all factors all experimentize.In the present embodiment, said total divisor experimental method is that all combinations that the n ' of each parameter in A, B, C, four parameters of D plants value are all experimentized.The second constructed experimental design table is shown in Fig. 6 B.
Step S17 utilizes the experimental formula of P the eye height that above-mentioned match comes out, and every group of experiment in this second experimental design table calculated, and calculates P eye height of every group of experiment as shown in Figure 7.For example, as shown in Figure 6 for first group in second experimental design table experiment, A, B, C, D are respectively " 1 ", " 1 ", " 1 ", " 1 ", and promptly the value of A, B, C, D is respectively " 3000 ", " 650 ", " 1300 ", " 300 ".The value of A, B, C, D is distinguished in the experimental formula of P eye height of substitution, obtained P eye height of this group experiment.
Step S18, P eye height of every group of coming out according to aforementioned calculation experiment, as shown in Figure 8, filter out P eye height all greater than 1 some groups of experiments.
Step S19 calculates the mean value of P eye height of every group of experiment in the experiment of this some groups of screening.
Step S20 picks out that maximum group experiment of mean value of being calculated, and shown in Fig. 9 dash area, this is organized the optimized value of the value of m parameter in the experiment as m parameter of certain parameter that influences the circuit board signal transmission quality.
Claims (6)
1. parameter optimization obtaining value method that influences the circuit board signal transmission quality is characterized in that this method comprises:
Influence m parameter of certain parameter of circuit board signal transmission quality on the acquisition cuicuit plate in P components and parts;
Each parameter in the above-mentioned m parameter is provided with n kind value;
N kind value according to each parameter in this m parameter makes up the first experimental design table;
Carry out simulated experiment according to the above-mentioned first experimental design table, test a resulting P eye height for every group that writes down in this first experimental design table;
According to every group of P eye height that experiment obtains in the above-mentioned first experiment table, utilize a preset model formation, carry out regression Calculation through mathematical algorithm, simulate the experimental formula of P eye height;
An above-mentioned m parameter is provided with n ' plants value, wherein, n ' is greater than n;
N ' according to each parameter in this m parameter plants value, makes up the second experimental design table;
Utilize the experimental formula of P the eye height that above-mentioned match comes out, every group of experiment in this second experimental design table calculated, calculate P eye height of every group of experiment;
P eye height of every group of experiment of coming out according to aforementioned calculation filters out P eye height all greater than 1 some groups of experiments from the second experimental design table;
Calculate the mean value of P eye height of every group of experiment in this some groups of screening experiment; And
Pick out that maximum group experiment of mean value of being calculated, the value of m parameter during this group is tested is as the optimized value of this m parameter.
2. the method for claim 1 is characterized in that, a said P components and parts are meant P internal memory on the circuit board, and said m the parameter that influences certain parameter of circuit board signal transmission quality is meant the m kind parameter of this P internal memory wiring line segment length.
3. the method for claim 1 is characterized in that, said n is 3.
4. the method for claim 1 is characterized in that, said n ' is 5.
5. the method for claim 1 is characterized in that, the said first experimental design table is to utilize the reaction Surface Method to make up.
6. the method for claim 1 is characterized in that, the said second experimental design table is to utilize the total divisor experimental method to make up.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180137228A1 (en) * | 2016-11-14 | 2018-05-17 | Fujitsu Limited | Simulation assist apparatus and simulation assist method |
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2010
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| US20050201757A1 (en) * | 2002-10-08 | 2005-09-15 | Marc Bohn | Method and arrangement for determining signal degradations in the presence of signal distortions |
| CN1758580A (en) * | 2004-10-08 | 2006-04-12 | 鸿富锦精密工业（深圳）有限公司 | Shake graph generating device and method |
| US20080232520A1 (en) * | 2004-11-01 | 2008-09-25 | Synopsys, Inc. | Method and apparatus for eye-opening based optimization |
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Application publication date: 20120516 |