On 3W valuation principles and crosstalk between the traces of

It is said that mathematicians have hated physicists, as mathematician Xin Xin's conclusions are the same as the conclusion that physicists guess. Of course, this is just a joke, but it is indeed an application engineer, it is often necessary to know how it comes to it and its trend, and it is not necessary to completely derive them like a scientist. That let's take a look at the 3W principle, as shown below: The center of the guaranteed cable is greater than the triple line, which is the 3W principle we usually say. In fact, the 3W principle should be changed to the principle of 3h. This h refers to the distance from the reference plane, as shown in the figure, when the trace reaches 3 h, the edge of the static line is very small. Most electromagnetic fields are wrapped between the traces and reflow planes. Here everyone should remember a value. When the trace reaches 3W, the crosstalk rate is about 2% (near-end crosstalk). Some people can't help but ask, do you have different W, as long as it meets 3W principles, is their crosstalk? That's right, their crosstalk rate is really almost. Of course, this is in our usual FR4 material, the impedance is controlled in 50 ohms. If W is reduced, the actual distance between the two lines is coming, but the crosstalk will become large, but to keep 50 ohm impedance, the trace must be closer to the reference plane, so that crosstalk will become smaller. Changes in crosstalk between one chapter have not changed. The case is similar to the case. Remember 3W's crosstalk rate, we just know how much the change in the center of the trace and crosstalk can be estimated to the crosstalk between the traces. Is the central distance change changed to each other between the two lines? Is there a formula for Duang in the brain? The capacitance size is inversely proportional, is it said that the distance is doubled, and the crosstalk minus half? Nonono is a formula for a flat-panel capacitor, but in fact our line is three-dimensional, it should be a distance to n, and crosstalk is 1 / N2. Just like Lorenz, with extraction. Note that the distance here refers to the center distance. Of course, the actual crosstalk is related to the factors such as loss, reflection, dielectric constant, coupling length. However, such an estimated method is also enough to respond to most of the situation. Edit: hfy, read full text

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