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The core part of the PCB design method based on signal integrity computer analysis is the establishment of the PCB board level signal integrity model, which is the difference from the traditional design method. The correctness of the SI model will determine the correctness of the design, and the establishability of the SI model determines the feasibility of this design method.

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Signal integrity analysis model

In order to perform circuit simulation, it is necessary to first build a model of the component, that is, for the various components supported by the circuit simulation program, there must be a corresponding mathematical model to describe them in the simulation program, that is, a calculation formula that can be calculated by a computer. To express them. An ideal component model should reflect both the electrical characteristics of the component and the numerical solution on the computer. In general, the higher the accuracy of the device model, the more complex the model itself, and the more the number of model parameters required. In this way, the amount of memory occupied increases and the calculation time increases. While integrated circuits often contain a large number of components, a slight increase in the complexity of the device model can double the computation time. Conversely, if the model is too rough, the analysis results will be unreliable. Therefore, the complexity of the component model used depends on actual needs.

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Characteristic impedance control of PCB

The range of variations in characteristic impedance control must consider four factors:

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Characteristic impedance of printed circuit boards

Posted on December 29, 2018 by G

The characteristic impedance of the multi-layer signal transmission line, Z0, currently requires a control range of typically 50 Ω ± 10%, 75 Ω ± 10%, or 28 Ω ± 10%.

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Signal Integrity: Reflections from changes in PCB trace width

When PCB layout is performed, it often happens that when a trace passes through an area, due to the limited wiring space of the area, thinner lines have to be used, and after passing through this area, the line is restored to its original width. A change in the width of the trace causes a change in impedance, so reflection occurs and affects the signal. So under what circumstances can this effect be ignored, and under what circumstances must we consider its impact?

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How to effectively design the surface of a printed circuit board

Posted on December 29, 2018 by G

The components should be arranged in a straight line in the order of the electrical schematics, and the compactness is required to shorten the length of the printed conductors and achieve a uniform assembly density. Under the premise of ensuring electrical performance requirements, the components shall be parallel or perpendicular to the board surface and parallel or perpendicular to the main board edge. It is evenly distributed on the board surface.

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Printed circuit board structure design

Posted on December 29, 2018 by G

Four designs and steps and methods

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EMC design of hybrid integrated circuits

Posted on December 27, 2018 by G

Starting from the improvement of system electromagnetic compatibility, combined with the characteristics of hybrid integrated circuit technology, the problems that should be paid attention to and the specific measures taken in the design of hybrid integrated circuits are proposed.

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Electromagnetic compatibility design - circuit layout

Posted on December 27, 2018 by G

In the circuit design, often only pay attention to improve the wiring density, or pursue uniform layout, ignoring the influence of the line layout on preventing interference, causing a large number of signals to radiate into the space to form interference, which may lead to more electromagnetic compatibility problems. Therefore, good wiring is the key to success in design.

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About PCB Place inspection and processing

Posted on December 25, 2018 by G

In design, layout is an important part. The quality of the layout results will directly affect the effect of the wiring, so it can be considered that a reasonable layout is the first step in the success of PCB design.

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Tag: pcb layout pcb place pcb processing

About PCB Route inspection and processing

Posted on December 25, 2018 by G

There are two ways to route: automatic routing and interactive wiring.

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Tag: pcb processing pcb route circuits

Signal integrity issues in high speed PCB design

Posted on December 25, 2018 by G

As device operating frequencies become higher and higher, the signal integrity issues faced by high-speed PCB design become a bottleneck in traditional design, and engineers face increasing challenges in designing complete solutions. Although the high-speed simulation tools and interconnect tools can help designers solve some of the problems, high-speed PCB design requires more experience and deep communication between the industry.

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Advantages and strategies for differential signal line routing

The differential signal pairs with very close wirings are also closely coupled to each other. This mutual coupling reduces EMI emissions. The main disadvantage of differential signal lines is the increased PCB area. This paper introduces the circuit board design process. Wiring strategy for differential signal line routing.

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Tag: signal lines advantages signals circuit

Power signal integrity considerations in PCB design

In circuit design, we are generally concerned about the quality of the signal, but sometimes we are often limited to the signal line for research, and the power and ground as the ideal situation to deal with, although this can simplify the problem, but in high-speed design This simplification is no longer feasible.

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Partition design of PCB mixed signal

How to reduce the mutual interference between digital signals and analog signals?

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A few steps in the PCB board design, don't go wrong

(1) The design of the circuit schematic: The design of the circuit schematic is mainly the PROTEL099 schematic design system (AdvancedSchematic) to draw a circuit schematic. In this process, we should make full use of the various schematic drawing tools and various editing functions provided by PROTEL99 to achieve our goal, that is, to obtain a correct and exquisite circuit schematic.

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A new way to solve the problem of high speed signal PCB design

In this article,I will tell you a new way to solve the problem of high speed singal pcb design

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Tag: PCB design pcb design high speed singal pcb design high speed pcb design

Principle of formation of PCB board wire impedance interference

At present, in the manufacture of printed circuit boards, the wires are mostly copper wires. The physical properties of the copper metal itself determine that there must be a certain impedance in the conduction process. The inductance component in the wires affects the transmission of voltage signals. The composition affects the transmission of the current signal, and the influence of the inductance is particularly prominent in the high-frequency line.

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Effect of vias on signal transmission

Via is one of the important components of a multilayer PCB, and drilling costs typically account for 30% to 40% of PCB board costs.

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Common impedance and suppression of PCB advanced design