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From PCB Design to Fabrication & Assembly
The General Introduction of PCB Design
The PCB Design Guide
Some Problems with the Layout of the Components
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Regarding the Common Software for PCB Design
There are many kinds of software used in PCB layout. According to different regions and needs, the commonly used software is also different. Protel series is a beginner-oriented design software, which is relatively simple to use. Its design framework is relatively simple and arbitrary, and there are not many conditions. Relatively, PCBs that are relatively simple in daily work can use this software to complete the design, which is also used by beginners. The second is the Eagle series. The main users of this software are mostly designers in Europe, which is not very difficult. It is a PCB design software suitable for beginners.
The following are the cadence series and the mentoree series. These two kinds of software are more complex to use, especially cadence. Its framework structure is very complex, and all aspects of its design are set under international standards, which is difficult to get started. But once it is used skillfully, the output products have a certain quality assurance.
Mentor company has two series, but the most commonly used one is the mentoree series. Compared with the previous three ones, it is also relatively complex. Compared with cadence, its outstanding feature is that its online design function is more powerful, which should be the best for online use and design at present, but it is slightly inferior to cadence in other aspects.
The use of SMT can adapt to trends such as the development of electronic components, the development of integrated circuits (ICs), and the diversified applications of semiconductor materials.
Next, take Protel series software as an example to list the general operation steps.
First, start the Protel series software and enter the editor window. Then set the size of the PCB first, and then put the components in the BOM list on the reasonable position of the PCB to complete the layout, and then connect the components with lines. Finally, adjust the layout rationality of lines and components to prevent conflicts and unreasonable placement. After completion, you can save it, and finally print out the drawing we just designed, so you can use Protel software to complete the design of a PCB.
Some Points Concerning Different Aspects of PCB Design
Pad is very important for the application of shape in the design of PCB. It is not only the shape in the software library, but also the shape needs to be designed and drawn up by yourself in case of special circumstances. There is no doubt that the pad is a crucial link. When many designers use it, they mostly choose conventional circular pads. There are many considerations about the shape of the pad. Different shapes should deal with different types of components and situations, especially for high-temperature components, which are prone to short circuits due to excessive current.
According to Viasion's many years of PCBA experience, usually, skilled employees in the industry will use teardrop-shaped pads to target these special and important components. The effect is very good, which can prevent the short circuit caused by excessive current or affect other nearby components. In addition, when selecting the shape, it is necessary to ensure that the difference with the pad is not too large, otherwise, the product quality will be affected. In addition, when connecting the circuit of components, the transmission effect and use effect of the pad with one long and one short and opposite mirror will be better.
The Main Process of PCB Design
I will use the RF PCB designed by Protel as an example to explain the main process of design.
Types of PCB Design
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We always insist on strictly implementing the production requirements of our customers to make products that satisfy them. We also establish a complete and humanized after-sales management system to make our customers feel sincere and secure. As a result, our company has gained the praise of our customers and 99% of our customers are satisfied with Viasion’s products and services.
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Frequently Asked Questions
What are the things to consider in PCB designing?
The following layout requirements for PCB components should be taken into consideration.
High, medium, and low-speed logic circuits should be arranged in different areas on the PCB.
The circuit should be arranged in such a way that the signal line length is minimized.
Ensure that there are no excessively long parallel signal lines between adjacent boards, between adjacent layers of the same board, or between adjacent routing on the same layer.
EMI filter should be as close as possible to the EMI source and placed on the same printed circuit board.
DC/DC converters, switching elements, and rectifiers should be placed as close to the transformer as possible to minimize their wire length.
Place voltage-regulating components and filter capacitors as close as possible to the rectifier diode.
Noise-sensitive routing should not be parallel to high current, and high-speed switching lines.
What is the process of PCB design?
In general, the basic process of PCB design is as follows: pre-preparation → designing the structure of PCB →the layout of PCB→ routing→ routing optimization and silkscreen → the DRC check and the structure check → outputting PDF file
What services do PCB design companies offer?
What are the benefits of using a PCB design company?
When the company’s design team cannot meet the demands of the design schedule and the quality of the design, it is useful to use a PCB design company.
Using a PCB design company shortens the time to develop products and get them to market.
For cost reasons, most small and medium-sized companies do not hire or just hire a few full-time PCB design engineers. These companies do not have many projects, and recruiting 1-2 full-time PCB design engineers is a waste of resources. In this case, it is more cost-effective and efficient for them to choose a PCB design company.
What should I look for in a PCB design company?
Know more about the strength and backgrounds of a PCB design company.
Focus on the quality and effect of the design.
Choose a PCB design company with high professionalism and a good service attitude.
Be sure to choose a company that can meet your needs, taking into account cost-effectiveness.
Are there any special considerations for PCB design?
Avoid high-frequency interference: Minimize interference from high-frequency signal electromagnetic fields, i.e., crosstalk.
Solve the problem of signal integrity: Basically, it is the problem of impedance matching. Factors affecting impedance matching include the signal source architecture and output impedance, the characteristic impedance of the routing, the characteristics of the load side, and the topology of the routing.
Implement differential wiring: There are two points to note regarding the wiring of differential pairs. One is that the length of the two lines should be as long as possible, and the other is that the spacing between the two lines (determined by the differential impedance) should be kept the same, i.e., parallel.
Matching resistor between the differential pairs at the receiver: Usually, a matching resistor is added between the differential pairs at the receiver, and its value should be equal to the value of the differential impedance for better signal quality.
The wiring of the differential pair should be closely parallel: The wiring of the differential pair should be properly closed and parallel. The proper proximity is because that spacing affects the value of the differential impedance, which is an important parameter for designing differential pairs. Parallelism is also required because the consistency of the differential impedance is maintained.
What types of PCBs can be designed?
Any type of PCB can be designed. Without being designed, PCBs can not be manufactured.
What are the most common issues in designing PCBs?
The following summarizes the common mistakes in PCB design.
Characters designed to be too small cause difficulties in silkscreen. Characters designed to be too large make characters overlap each other and difficult to distinguish.
The design does not conform to conventionality. For example, the component side is designed on the bottom layer while the solder side is designed on the top layer, causing inconvenience.
Some useless wiring was done on some graphics layers. For instance, a 4-layer PCB was designed with more than five layers of circuits, which caused misunderstanding.
Using filler blocks to draw pads in the PCB design can pass the DRC check, but is not conducive to PCBA processing, resulting in the difficulty of soldering components.