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Method for selecting decoupling condenser based on particle swarm algorithm

A decoupling capacitor and particle swarm algorithm technology, which is applied in the fields of instrumentation, calculation, electrical and digital data processing, etc., can solve the problems of unintuitive selection results, low degree of automation, and long simulation time, so as to achieve intuitive selection results and improve the degree of automation. , the effect of shortening the simulation time

Inactive Publication Date: 2012-05-02
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above three selection methods all have different degrees of defects. Among them, in the Big "V" method, it is necessary to continuously increase the number of maximum capacitors to meet the requirements of the target impedance, and usually need to use a large number of capacitors; the flat response method and the decade methods method It is required that the types of selected capacitors must be sufficient to ensure that the self-resonant frequency of these capacitors can cover the entire frequency range of the design; at the same time, the selection methods of these decoupling capacitors are all repeated processes of estimation, verification, adjustment, verification, and re-adjustment , to find a satisfactory solution after manual repeated selection, adjustment and verification, high complexity, low degree of automation, long simulation time, unintuitive selection results, these problems limit their practical application

Method used

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  • Method for selecting decoupling condenser based on particle swarm algorithm
  • Method for selecting decoupling condenser based on particle swarm algorithm
  • Method for selecting decoupling condenser based on particle swarm algorithm

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Embodiment 1

[0065] Set the basic parameters as follows:

[0066] The equivalent resistance R1 of the regulator on the printed circuit board is 0.001Ω, and the equivalent inductance L1 is 30nH;

[0067] The equivalent resistance R2 of the printed circuit board power / ground plane is 0.003Ω, and the equivalent capacitance C1 is 2.6nF;

[0068] The number of vias on the printed circuit board is 200;

[0069] The maximum current I of the integrated chip is 2A, the power supply voltage V1 is 2.5V, the ripple coefficient r is 3%, and the target frequency is 100MHz.

[0070] Based on the above parameters, the implementation steps of the present invention are used to simulate the particle swarm algorithm-based decoupling capacitor selection method proposed by the present invention through MATLAB 7.11.0 software. The simulation results are as follows: figure 2 ,in: figure 2 a is the impedance curve of the power distribution network, figure 2 b is the decoupling capacitor selection result.

...

Embodiment 2

[0074] Set the basic parameters as follows:

[0075] The equivalent resistance R1 of the regulator on the printed circuit board is 0.003Ω, and the equivalent inductance L1 is 25nH;

[0076] The equivalent resistance R2 of the printed circuit board power / ground plane is 0.004Ω, and the equivalent capacitance C1 is 3nF;

[0077] The number of vias on the printed circuit board is 160;

[0078] The maximum current I of the integrated chip is 2A, the power supply voltage V1 is 3.3V, the ripple coefficient r is 3%, and the target frequency is 120MHz.

[0079] Based on the above parameters, the implementation steps of the present invention are used to simulate the particle swarm algorithm-based decoupling capacitor selection method proposed by the present invention through MATLAB 7.11.0 software. The simulation results are as follows: image 3 ,in: image 3 a is the impedance curve of the power distribution network, image 3 b is the decoupling capacitor selection result.

[008...

Embodiment 3

[0083] Set the basic parameters as follows:

[0084] The equivalent resistance R1 of the regulator on the printed circuit board is 0.002Ω, and the equivalent inductance L1 is 35nH;

[0085] The equivalent resistance R2 of the printed circuit board power / ground plane is 0.002Ω, and the equivalent capacitance C1 is 2nF;

[0086] The number of vias on the printed circuit board is 100;

[0087] The maximum current I of the integrated chip is 2A, the power supply voltage V1 is 1.8V, the ripple coefficient r is 3%, and the target frequency is 80MHz.

[0088] Based on the above parameters, the implementation steps of the present invention are used to simulate the particle swarm algorithm-based decoupling capacitor selection method proposed by the present invention through MATLAB 7.11.0 software. The simulation results are as follows: Figure 4 ,in: Figure 4 a is the impedance curve of the power distribution network, Figure 4 b is the decoupling capacitor selection result.

[0...

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Abstract

The invention discloses a method for selecting a decoupling condenser based on a particle swarm algorithm, mainly aiming at solving the problem that the method in prior art takes a long time for selecting and has low automaticity. The method comprises the steps of: (1) setting basic parameters; (2) randomly generating a decoupling condenser matrix selected by particles; (3) judging whether the network impedance of the power-supply distribution is less than the target impedance after adding the decoupling condenser selected by particles, if so executing step (4), and otherwise, shifting to step (6); (4) updating a particle individual optimum solution matrix; (5) updating a population optimum solution matrix; (6) updating the decoupling condenser matrix selected by particles; and (7) judging whether iteration is finished, if so, extracting the population optimum solution matrix to obtain the selected decoupling condenser, and otherwise, shifting to the step (3). The method provided by the invention has the advantages of shortening simulation time, being visual in selecting result, improving the automaticity of selecting a decoupling condenser and being used for high-speed circuit design.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and further relates to a method for selecting power integrity and decoupling capacitors, which can be applied to high-speed circuit design and selection of decoupling capacitors. Background technique [0002] With the development of electronic products in the direction of high speed and high density, the clock frequency of chips is getting higher and higher, and the issues of signal integrity and power integrity have been paid more and more attention by people. The fluctuation of the voltage on the power distribution network will cause serious signal integrity problems. For this reason, the concept of the target impedance of the power distribution network is proposed, and the general power distribution network impedance is difficult to meet the requirements of the target impedance. Therefore, it must be in the printed circuit. Different types of decoupling capacitors are installed on the b...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 初秀琴孙景军张松松刘飞飞秦俊
Owner XIDIAN UNIV
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