With the rapid progress of the made in China 2025 plan and the popularity of the concept of industry 4.0, the world is gradually moving from the information age to the era of intelligence. Various traditional industries are undergoing intelligent upgrading, including industrial electronics, automotive electronics and military electronics.
At the same time, the functional demands of the public consumers for the terminal electronic products are getting richer and richer. Not only is the traditional electronic industry developing vigorously, but also a large number of emerging industries, such as artificial intelligence, smart home, smart wear and so on, have emerged.
When it comes to electronic products, semiconductor chips, electronic components and PCB circuit boards are indispensable. As the basic carrier of most electronic products, PCB circuit boards have become increasingly important.
Relevant fields, including raw material r&d and production, PCB r&d and design, and PCB production and manufacturing, will all exist as the important basis for the development of the electronic industry in the future. Therefore, the development prospect of the entire PCB industry in the long future is very worthy of expectation.
In fact, high-speed PCB design needs to face a lot of different product directions. Although some basic technologies are universal, there are still many industry-specific technical differences, because the design core requirements of each field are different.
For example, consumer products are featured by performance price.
On the contrary, absolute reliability is required in military and industrial fields.
And the data and communications field requires extreme product performance
All of these have different requirements for design rules and technology research and development.
If the key points of high-speed PCB design are relatively universal, I think it is important to pay attention to the following aspects:
1. Firstly, the design of power circuit. Power supply is the basis for stable work of electronic products. Although most of the time, the technical challenges of power supply design are not the greatest, once there is a problem of operational stability, it is actually related to power supply in many cases.
Power supply design of the key lies in the power supply module function design optimization, the conversion efficiency of ascension, and the power channel design and so on, all must follow the corresponding technical indicators and rules, for sensitive power or current great power simulation of PI is needed to improve dc voltage drop and the performance of the dynamic impedance and noise.
2: the design of high speed parallel signal is most commonly DDR3, DDR4 and other circuits, especially for such schemes as Memory Down (onboard Memory bar) design, which requires special attention. While strictly implementing the Layout Guide of the original factory, it is better to optimize the Layout and wiring design through simulation analysis to ensure the design quality of high speed signal.
There are many other types of parallel signal design. In general, the absolute length and relative equal length are controlled in accordance with the corresponding chip design rules. At the same time, the rule control on the number of holes, signal cross segmentation and crosstalk can meet most design requirements.
3: high speed serial signal design, high speed serial signal is developing very rapidly in recent years, many traditional parallel bus interface are gradually replaced by a serial bus, such as the most typical IDE hard disk data parallel interface, is replaced by SATA serial data interface, the application of high speed serial signal also believe that the future will become more and more widely.
By far the most common PCIE high-speed channel and SATA, SAS, an LVDS, start the channel, and high-speed optical network channels, such as signal speed generally have been promoted to the 5 g, 8 g, 10 g, 28 g 56 GBPS even levels, so must be strictly in accordance with the corresponding high-speed design rules to design, want to do a good job of signal integrity analysis and optimization at the same time, or it will prone to signal quality issues.
4: there are also many other key technical points to be paid attention to, such as analog signal design, rf signal, digital mode mixing, as well as design points of DFM, DFA and EMC, etc. There are a series of rules and requirements in each direction.
As for the context of high speed design, this is difficult to use a few words clear.
Because any professional field has a complete set of work procedures and rules system, it is a very complex technology and management system engineering.
To have a deep understanding of an industry, you can't really understand it until you get into it and work your way through it for a few years.
And even in the same industry, but in different technology areas, there are also great differences.
As the saying goes, even if you have worked in a specific area of the same industry for many years, it is possible to move to another area where your previous work experience should be completely eliminated.
For example, from low-end consumer product design to military industrial and communications product design, the previous work experience may be very limited, because design rules and knowledge systems are completely different.
This is actually the difference between the industry and the circle, so it is not only the choice of the industry, but also more important to pay attention to the difference and choice of the circle.