How to consider the problem of impedance matching in high -speed PCB design schematic design?

When designing a high -speed PCB circuit, impedance matching is one of the elements of the design. The impedance value has an absolute relationship with the wiring method, such as walking on the surface layer (Micros) or the inner layer (Stripline/Double Stripline), the distance from the reference layer (power layer or ground), width width, PCB material, etc. All affect the characteristics of the line's characteristics.

In other words, the impedance value must be determined after the wiring. Generally, simulation software will not consider some impedance incomplete wiring conditions due to the limitation of the line model or the limitation of the mathematical algorithm used. Eashing the effects of increasing routing impedance. The way to really solve the problem is that you should try to avoid increasing impedance during the wiring.