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Design A High Quality PCB, You Only Need To Do This Seven Points
gesptechnologypcbJune 18, 2017 Blog 0 Comment209views

PCB was born in 1936, the United States in 1943 the technology will be used in a large number of military radio; since the mid-20th century, 50 years, PCB technology began to be widely used. At present, PCB has become the “mother of electronic products,” its application is almost infiltrated in the electronics industry in the various terminal areas, including computers, communications, consumer electronics, industrial control, medical equipment, defense industry, aerospace, and many other regions.

PCB from single-layer development to double-sided, multi-layer and flexible, and still maintain their respective development trends. As a result of continuous high-precision, high density, and high-reliability direction, continue to reduce the size, reduce costs and improve performance, making the PCB circuit board in the future development of electronic equipment, still maintained a strong vitality.

So how is the PCB design? Read the following seven steps to understand:

1.Pre-prepared

Including the preparation of component libraries and schematics. Before proceeding with the PCB design, prepare the schematic SCH component library and the PCB component package.

The PCB component package is best built by the engineer based on the standard size of the selected device. In principle, the establishment of the PCB component package library and then make the schematic SCH component library.

PCB component package library requires a higher, and it directly affects the PCB installation; Schematic SCH component library requirements are relatively loose but pay attention to the definition of excellent pin properties and PCB components package library correspondence.

2.PCB structure design

According to the board size and the mechanical positioning, in the PCB design environment to draw PCB frame, and according to the positioning requirements of the required connectors, buttons/switches, screw holes, assembly holes and so on.

Fully consider and determine the wiring area and non-wiring area (such as the scope of the screw hole around the non-wiring area).

3.PCB layout design

The layout design is in the PCB board frame by the design requirements of the device. Create a network table (Design →Create Netlist) in the schematic tool, and then import the network table (Design → Import Netlist) in the PCB software. After the success of the network, the table exists in the software background, through the Placement operation can be all the devices out of the pin between the line suggested that the connection, then the device layout can be designed.

PCB layout design is the PCB design process in the first necessary process, the more complex the PCB board, the layout of the better and more direct impact on the late implementation of the degree of difficulty.

Layout design relies on the circuit board designer foundation and design experience of the rich; the circuit board designers are a higher level of requirements. The experience of the primary circuit board designer is still shallow, suitable for small module layout design, or the whole board is awkward to PCB layout design tasks.

4.PCB layout design

PCB layout design is the PCB design of the most massive workload, directly affect the performance of the PCB board is good or bad.

In the PCB design process, wiring generally has three realms:

The first is the cloth, which is the most basic PCB design requirements;

Followed by the performance of an electrical performance, which is a measure of whether a standard PCB board, after the line wiring, carefully adjust the installation, so that it can achieve the best electrical performance;

Once again, neat and beautiful, chaotic wiring, even if the electrical performance clearance will also be to the latter part of the board optimization and testing and maintenance to bring great inconvenience, wiring requirements uniform, can not be criss-cross any rules.

5. Wiring Optimization and Silkscreen Display

“PCB design is not the best, only better,” “PCB design is a defective art,” which is mainly because the PCB design to achieve all aspects of the hardware design requirements, and individual needs may be between the conflict, fish and Bear’s paw can not have both.

For example, a PCB design project through the circuit board designer needs to be designed into a 6-layer board, but the product hardware for cost considerations, the requirements must be designed for the 4-layer board, then only sacrifice the signal shield formation, resulting in adjacent wiring The signal crosstalk between the layers increases and the signal quality decreases.

The general design experience is that optimizing the routing time is twice the time of the initial cabling. PCB layout optimization is completed, the need for post-processing, the primary treatment is the PCB board of silkscreen logo, the design of the bottom of the silkscreen characters need to do mirror processing, so as not to be confused with the top screen printing.

6.Network DRC Inspection and Structural Inspection

Quality control is an essential part of the PCB design process, and the general quality control means include design self-test, mutual design inspection, expert review meeting, special inspection.

Schematic diagram and structural elements map are the most basic design requirements, network DRC inspection, and structural inspection are to confirm the PCB design to meet the schematic netlist and structural elements of the two input conditions.

General circuit board designers will have their accumulation of design quality check Checklist, which part of the entry from the company or department of the specification; the other part comes from their own experience. A special inspection includes the design of the Valor inspection and DFM inspection, these two parts concerned about the PCB design output back-end processing light painted files.

7.PCB Board

PCB board in the formal processing before the board, the circuit board designers, need to PCB board for the PE to communicate, reply to the manufacturers on the PCB board to confirm the problem.

This includes but is not limited to PCB board model selection, line layer line width adjustment, impedance control adjustment, PCB stacking thickness adjustment, surface treatment processing technology, aperture tolerance control, and delivery standards.

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