PCB News - How important is the PCB printed circuit board?

The important influence of PCB layout on printed circuit board determines the cost of manufacturing, installation and later maintenance of printed circuit board to a certain extent. In electronic design tends to be high-density, the PCB layout and wiring of each electronic product is particularly important. PCB wiring design can often achieve a higher layout rate, reduce jumper distribution, electromagnetic interference between connections, and effectively reduce noise generation.

Over the years, PCB seems to have been "downgraded" in the field of electronic engineering and has become an unsung hero who only pays silently behind the scenes. Managers believe that PCB wiring is a trivial manufacturing problem, not a design engineer needs to care about; but as digital circuits become Faster and faster, and RF circuits are also put into the PCB, circuit boards have become a limiting factor in many designs. Although computer-aided design (CAD) tools can help engineers design circuit boards, the automatic winding function of CAD usually Bring more questions...

Like all new technologies, it took a long time for engineers to accept and promote printed circuit board (PCBs). In the 1960s, Zeneth, a veteran American electronics company, always advertised that they used point-to-point wiring. Now, almost all electronic products are made of PCB.

But over the years, PCB seems to have been "downgraded" in the field of electronic engineering, and has become an unsung hero who only pays silently behind the scenes. Managers believe that PCB wiring is a trivial manufacturing problem, not a design engineer needs to care about; but as digital circuits change Faster and faster, and RF circuits are also put into the PCB, circuit boards have become a limiting factor in many designs. Although computer-aided design (CAD) tools can help engineers design circuit boards, the automatic winding function of CAD is usually Will bring more problems.

The centrality of PCB in design work; always looking for new ways to design and build circuit boards. While our colleagues in the industry are still discussing the instruction cache architecture of the 68020 chip, they are already talking about circuit board wiring procedures and prototype production that can be completed in one night.

Massa said: "In my 40 years of electronic design experience, circuit boards always hinder the limiting factors of each design project;" You should not just make circuit diagrams just to cope with the work, you have a higher level of responsibility to look at those The circuit diagram is transformed into a product that can be built and sold.

Modern PCB is not only a time killer, but also a key component with precise design requirements; the operating frequency of electronic equipment and the signal rise/fall time are getting faster and faster, so PCB has become more and more important. Take a look at the following short stories that actually happened, and you will get some enlightenment.

A printed circuit board story about flying fighter jets

I have been involved in the design of radar jamming devices for F-16 fighter jets. I have learned that some companies may also encounter systemic PCB problems; circuit board wiring is considered a mechanical engineering task, so our electronic engineers throw out the circuit diagrams for other departments Do the circuit board wiring work.

The circuit board I got had a very high-speed emission coupled logic (ECL) oscillator, but the 8-layer circuit board prototype could not work; because there was ample space on the circuit board level, I wondered how they did the design. Smashed. It turns out that in order to simplify the design of the aluminum radiator under all parts, the mechanical engineer arranges the position of the components according to the shape; the ECL chip is located on the upper left of the circuit board, the resistor is placed in the middle, and the crystal oscillator is on the right The bottom corner is exactly 8 inches from the ECL chip.

Since then, we will ensure that when the mechanical engineer arranges the components on the PCB printed circuit board, there is an electronic engineer sitting next to it, and will review the entire layout before preparing for manufacturing