The Basic PCB Design Process is as follows:
Pre-preparation -> PCB structure design -> PCB layout -> wiring -> wiring optimization and screen printing -> network and DRC check and structure check -> plate making.
Why do we need a PCB design?
In this way, PCB design is an indispensable part of any project. However, in the previous design, due to the very low frequency, very small density, and large spacing between the tubes of the devices. The PCB design is aimed at connectivity without any other functional or performance challenges.
So for a long time, PCB design was very low in the overall project. It was usually the hardware logic connection designer who did the physical connection of the PCB. There are still some small products in the development of such a model, smartphone.
With the rapid development of electronics and communications technology. Today’s PCB design is already facing very different and new challenges.
Steps PCB Design Process
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 a PCB frame. and according to the positioning requirements of the required. such as connectors buttons/switches, screw holes, assembly holes, and so on. Fully consider and determine the wiring area and 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 the better. and more direct impact on the late implementation of the degree of difficulty.
Layout design relies on the circuit board designer’s foundation and design-rich experiences. 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 for PCB layout design tasks.
4. PCB Wiring
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. that 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, but it is better.” PCB design is a flawed art. This is primarily due to the PCB design’s ability to meet all aspects of the hardware design requirements. Individual needs may be in conflict, but fish and Bear’s paw cannot have both.
A PCB design project, for example, It designed into a 6-layer board for a circuit board designer. However, for cost reasons, the product hardware and the requirements need to be designed for the 4-layer board. The signal shield formation is then sacrificed, resulting in adjacent wiring. Signal crosstalk between layers increases, lowering signal quality.According to design experience, optimizing the routing time takes twice as long as the initial cabling.
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 and mutual design inspection. the expert review meeting, and special inspection.
A 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.Plate and Making
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 change. PCB stacking thickness change, surface treatment processing technology. aperture tolerance control, and delivery standards.
Our PCB Design Process Focuses on：
- The realization of the function
- Stability of performance
- Easy processing
- Aesthetics of the veneer
Even under the same logic connection, the same device. but PCB their performance test results will be different. A good design not only product stability, and can pass a variety of demanding tests. But not ideal design is not possible to achieve such results. In some low-end products, many manufacturers use the same chipset, the logic connection is similar. The only difference is the level of their respective PCB design. product differentiation is mainly reflected in the design of the PCB. GESP PCB has 20 years of experience in PCB design, and PCB Fabrication.Please contact us freely.