Design requirements for PCB：
PCB design shoud be right
This is the most basic and important requirement of PCB design. It is necessary to accurately connect the electrical schematic diagram and avoid the two simple and fatal errors of “short circuit” and “open circuit”. This basic requirement is not easy to do in manual design and PCB in simple CAD software. The general products have to be modified by more than two rounds of trial production. The CAD software with strong functions has inspection function, which can ensure the correctness of electrical connection.
PCB design should be reliability
This is the higher level of the PCB design,not all correct circuit board have good reliability. For example, unreasonable selection of PCB material, improper thickness and installation, improper layout and wiring of components, etc., may lead to PCB’s failure to work reliably, early failure even can’t continuing work. It is much easier to design a multi-layer board than a single or double side board, but it is not as reliable as a single or double sided board. From the reliability point of view, the simpler the structure, the smaller the use of the panel, the less the number of layers, the higher the reliability.
PCB design should be rationality
This is a deeper and more difficult requirement in PCB design. A printed board component, from the manufacturing, inspection, assembly and commissioning of the printed board to the assembly and commissioning of the whole machine until the use of the printed board, is closely related to the rationality of the printed board. For example, the shape of the board is not well chosen, the processing is difficult, the lead hole is too small to assemble, and it is difficult to leave the pilot. Every difficulty can lead to higher cost and longer working hours. And every cause of difficulty comes from the designer’s fault. There is no absolute rational design, only the process of rationalization. It requires the designer’s sense of responsibility and rigorous style of work, as well as the experience of summarizing and improving in practice.
PCB design shoud consider economics
This is a goal that is not hard to achieve and difficult to achieve, but must be achieved. It is not difficult to say that the board should be selected at a low price, and the size of the boards should be as small as possible. Direct welding wires should be connected, and the cheapest surface should be applied to choose the lowest price PCB manufacturer. The price of PCB manufacturing will fall, But don’t forget that these cheap choices may result in poor manufacturability and reliability and increase manufacturing costs and maintenance costs, The overall economy is not good, so it’s not easy. “Must” is the principle of market competition. Competition is merciless. A product with advanced principles and high technology may be aborted for economic reasons.