Knowledge points: How to reduce the crosstalk problem of high-frequency PCB circuit wiring?

by:A-TECH      2021-03-19
When it comes to high-frequency circuit wiring, PCB engineers are more troublesome, probably because of the crosstalk of high-frequency signals. So, how to reduce the problem of high-frequency PCB circuit wiring crosstalk? Because high-frequency signals are transmitted along the transmission line in the form of electromagnetic waves, the signal line will act as an antenna, and the energy of the electromagnetic field will be emitted around the transmission line and between the signals The generation of undesired noise signals due to the mutual coupling of electromagnetic fields is called crosstalk. In order to reduce the crosstalk of high-frequency signals, it is required to do as much as possible when wiring: 1. When the wiring space permits, insert a ground wire or ground plane between the two wires with more serious crosstalk to isolate The effect of reducing crosstalk. 2. When there is an electromagnetic field in the space around the signal line, if parallel distribution cannot be avoided, a large area of u200bu200b'ground' can be arranged on the opposite side of the parallel signal line to greatly reduce interference. 3. When the wiring space permits, increase the distance between adjacent signal lines, reduce the parallel length of the signal lines, and try to make the clock line perpendicular to the key signal line. 4. If parallel wiring in the same layer is almost unavoidable, the wiring directions must be perpendicular to each other in two adjacent layers. 5. In the design, it is advisable to surround the clock line with a ground wire and punch more ground wire holes to reduce distributed capacitance, thereby reducing crosstalk. 6. The high-frequency signal clock should try to use a low-voltage differential clock signal and the ground mode. 7. Do not suspend the unused input terminal, but ground it or connect it to the power source, because the dangling wire may be equivalent to the transmitting antenna, and the grounding can inhibit the emission. The above are some of the methods that engineers shared with you to reduce the crosstalk problem of high-frequency PCB circuit wiring. I hope to help you.
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