High Speed (& Gt; 100MHz) High Density PCB Design Skills Sharing

When the size of the circuit board is fixed, if more functions need to be accommodated in the design, it is often necessary to improve the routing density of the PCB, but this may increase the mutual interference of the routing, and the impedance cannot be reduced due to too thin routing. Please introduce the skills in the design of high-speed (> 100MHz) high-density PCB?

When designing high-speed and high-density PCBs, crosstalk interference really needs special attention, because it has a great impact on timing and signal integrity. Here are some points to note:

1. Control the continuity and matching of routing characteristic impedance.

2. Size of routing spacing. Generally, the spacing often seen is twice the linewidth. The influence of routing spacing on timing and signal integrity can be known through simulation, and the tolerable minimum spacing can be found. The results of different chip signals may be different.

3. Select appropriate termination method.

4. Avoid that the routing directions of the upper and lower adjacent layers are the same, or even the routing lines overlap up and down, because this crosstalk is greater than that of the adjacent routing on the same layer.

5. Use blind / buried via to increase routing area. However, the manufacturing cost of PCB will increase. In practice, it is really difficult to achieve complete parallelism and equal length, but we should try our best. In addition, differential termination and common mode termination can be reserved to mitigate the impact on timing and signal integrity.

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High Speed (& Gt; 100MHz) High Density PCB Design Skills Sharing 1

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