In the process of PCB design, if possible risks can be predicted in advance and avoided in advance, the success rate of PCB design will be greatly improved. Many PCB factories have an indicator of the success rate of a PCB design board when evaluating a project.
The key to improve the success rate of a board lies in signal integrity design. The current electronic system design, there are a lot of product solutions, chip manufacturers have done, including what chip to use, how to build peripheral circuits and so on.
Most of the time, hardware engineers hardly need to consider the circuit principle, just need to make the PCB by themselves.
However, it is in the process of PCB design that many enterprises encounter difficulties. Either the PCB design is unstable or it does not work. For large enterprises, many chip manufacturers will provide technical support and guide PCB design. But some small and medium-sized enterprises are difficult to get this support. Therefore, you have to find a way to do it yourself, which leads to numerous problems, which may require several versions, debugging for a long time. In fact, if you understand the design method of the system, these can be completely avoided.
Here are three tips for reducing PCB design risk:
1. In the system planning stage, it is better to consider the problem of signal integrity. The whole system is built in this way. Can the signal be received correctly from one PCB to another? This requires evaluation in the early stage, and it is not very difficult to evaluate the problem, a little knowledge of signal integrity, a little simple software operation can be done.
2. In the PCB design process, the simulation software is used to evaluate the specific routing and observe whether the signal quality can meet the requirements. The simulation process itself is very simple. The key is to understand the principle knowledge of signal integrity and use it as a guide.
3. Risk control must be carried out during PCB making. There are a lot of problems, simulation software has not been able to solve, must be controlled by the designer. The key to this step is to know where the risks are, what to do to avoid them, and again, the knowledge of signal integrity is required.
If we can grasp these three points in the PCB design process, the PCB design risk will be greatly reduced, the probability of error will be much lower after the board back, and debugging will be relatively easy.