For PCB design novices, some design points need special attention. If you don’t pay attention, the designed PCB will probably not be put into use. Now let’s understand the points indesign.
First, it is equal length. When designing the differential line, pay attention to making the two signal lines the same length. Because the length of the signal line is the same, the transmission time of the signal is also the same, so the polarity of the differential signal will be different, resulting in the opposite situation. If the differential signals are the same, the signal quality will be poor.
Next, it is equidistant. In other words, the distance between the pairs of differential lines must be consistent. By adjusting the distance of the differential line, we can adjust a differential impedance throughout the process. What are the benefits of doing this? If our differential impedance can maintain a certain degree of continuity, there will be very little reflection, and the transmitted signal will be the most complete.
Finally, it is the stacking of differential lines and printed boards. It is generally believed that the differential line will provide a return path for the printed board, and the printed board will use this method to reflow through the differential line, so pay attention to stacking the differential line and the printed board during the design.
When designing the, only by memorizing the above three points can the probability of error be greatly reduced, and the design quality and use value of the can be continuously improved, so as to truly output high-quality products for customers.