If the distance between high-speed signal lines is too close in the original printed circuit board layout diagram and gerber file, it is easy to produce crosstalk, so it is necessary to reverse engineering printed circuit board original layout diagram, gerber file, Sometimes, due to circuit board layout, board frame size and other reasons, the distance between our high speed signal lines exceeds our minimum required distance, Then we can only increase the distance between high-speed signal lines in the PCB board reverse engineering as much as possible near the bottleneck.
reverse engineering printed circuit board original layout diagram, gerber file
In fact, if the space is sufficient, try to increase the distance between the two high-speed signal lines. A long stub wire is equivalent to an antenna, and improper handling can cause serious PCB board EMC problems. At the same time, the stub line will also cause reflections, reducing the electronic pcb card integrity of the signal.
improper handling can cause serious PCB board EMC problems
Usually when a pull-up or pull-down resistor is added to a high-speed signal line, the stub line is most likely to be generated. Generally, the wiring of the stub line can be daisy-lined. According to experience, if the length of the stub line is greater than 1/10 wavelength, it can be used as an antenna, which will become a problem at this time.
