Precision PCB Fabrication, High-Frequency PCB, High-Speed PCB, Standard PCB, Multilayer PCB and PCB Assembly.
The most reliable PCB & PCBA custom service factory.
Talk about the effect of the snake-shaped routing of the Shenzhen PCBA board
Paying attention to the trend of environmental protection informatization and the development of various environmental protection technologies, PCB factories can start with big data to monitor the company's pollution discharge and governance results, and find and solve environmental pollution problems in a timely manner. Keep up with the production concept of the new era, continuously improve resource utilization, and realize green production. Efforts to make the PCB factory industry realize an efficient, economical and environmentally friendly production model, and actively respond to the country's environmental protection policy.
Any trace on the PCB will cause a time delay to the signal when it passes a high-frequency signal. The main function of the serpentine trace is to compensate for the less delayed parts of the "same group of related" signal lines. These parts Usually no or less than other signals through other logic processing; the most typical is the clock line, usually it does not need to go through any other logic processing, so its delay will be less than other related signals.
The equal line length of the high-speed digital PCB board is to keep the delay difference of each signal within a range to ensure the validity of the data read by the system in the same cycle (when the delay difference exceeds one clock cycle, the next cycle will be read incorrectly. Data), generally requires that the delay difference does not exceed 1/4 clock cycle, the line delay difference per unit length is also fixed, the delay is related to the line width, line length, copper thickness, and layer structure, but the line length will increase the distributed capacitance And distributed inductance, so that the signal quality, so the clock IC pins are generally connected to RC termination, but the serpentine trace does not play the role of inductance, on the contrary, the inductance will make the higher harmonic phase shift in the rising element of the signal., Causing the signal quality to deteriorate, so the serpentine line spacing is required to be at least twice the line width.The smaller the signal rise time, the more susceptible to the distributed capacitance and distributed inductance.
Because different applications have different functions, if the serpentine trace appears in the computer board, it mainly acts as a filter inductor to improve the anti-interference ability of the circuit. The serpentine trace in the computer motherboard is mainly used in Some clock signals, such as CIClk, AGPClk, have two functions:
1. Impedance matching
2. Filter inductance. For some important signals, such as the HUBLink in the INTELHUB architecture, there are 13 channels running at 233MHz. The length must be strictly equal to eliminate the hidden dangers caused by time lag. Winding is the only solution.
Generally speaking, the line spacing of serpentine traces is >=2 times the line width. The snake line on the PCI board is to meet the line length requirements of PCI33MHzClock. If it is a distributed parameter LC filter in an ordinary PCB board, it can also be used as an inductance coil of a radio antenna, and the short and narrow serpentine trace can be used as a fuse, etc. Our factory is located in China. For decades, Shenzhen has been known as the world's electronics R&D and manufacturing center. Our factory and website are approved by the Chinese government, so you can skip the middlemen and buy products on our website with confidence. Because we are a direct factory, this is the reason why 100% of our old customers continue to purchase oniPCB.
