PCB News - Why do all circuit boards use serpentine traces?

Why do all circuit boards use serpentine traces?
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The serpentine trace is to maintain the same delay of the same type of signal line. If you follow a straight line, the length is different, the frequency of the signal on the line is high, and the speed is fast, which may cause confusion when reading.
Especially for the PCB wiring of the DRAM interface, where there is a very high requirement for interface signal synchronization (G on the clock), it is necessary to ensure that each line is the same length. Therefore, some wiring must be lengthened deliberately and arranged in a serpentine shape, even if it could be connected to a short place, so that the delay is consistent with other wiring. The length and interval of the lines are restricted, not arbitrary, so they are related to the clock frequency, delay relationship, and even hardware device technology.

Snake-shaped wiring can carry out long wiring in a short space, so it saves area, and it also has a certain inhibitory effect on electromagnetic interference (make full use of the overlapped part of the wiring to cancel it). Some are to prevent electromagnetic interference (EMI) and prevent parasitic interference. Too many parallel lines will have a capacitive effect, and they cannot be flushed. The circuit board wiring of high-frequency lines needs to consider these, mainly considering how to deal with the sudden change of current or voltage. Isolation of high-frequency parts, separation of high-frequency and low-frequency, insertion of power lines and ground wires, and avoiding large loops in the wiring are some methods. It is also necessary to avoid sharp corners in the design, so sharp corners must be made obtuse.
In addition, it will form a right angle when turning in a straight line. The low frequency does not matter, the high frequency easily causes reflections. The most important thing is that it is easy to lift up during 90-degree processing, and it is particularly easy to break. iPCB is happy to be your business partner. Our business goal is to become the most professional prototyping PCB manufacturer in the world. With more than ten years of experience in this field, we are committed to meeting the needs of customers from different industries in terms of quality, delivery, cost-effectiveness and any other demanding requirements. As one of the most experienced PCB manufacturers and SMT assemblers in China, we are proud to be your best business partner and good friend in all aspects of your PCB needs. We strive to make your research and development work easy and worry-free.
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