source:Industry News release time:2024-01-22 Article author:yu Popular:pcb
1) The USB interface is placed close to the edge of the board and extends to a certain position on the board edge for easy insertion and removal;
2) ESD and common mode inductor devices are located near the USB interface, and the high-speed PCB training expert Fan Yi Education places them in the order of ESD common mode inductor resistance capacitance; Similarly, pay attention to the distance between ESD and USB, leaving a gap of 1.5mm, considering the situation of post welding, as shown in Figure 2.
3) USB needs to be differentiated, with an impedance control of 90 ohms and ground processing. The total length should not exceed 1800mil; The equal length method is similar to HDMI winding.
4) In order to suppress electromagnetic radiation, the differential lines of USB are prioritized to run on the inner layer and ensure a complete reference plane for the routing. Otherwise, the routing will be divided, causing impedance discontinuity and increasing the impact of external noise on the differential lines;
5) When routing USB differential, try to minimize layer changing vias as much as possible, as vias can cause discontinuity in line impedance. Add a pair of return ground vias at each hole and layer changing location for signal return and layer changing
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