How is impedance determined?
Impedance usually ranges from 25 to 125 ohms and depends mainly on the following factors.
Width and thickness of the copper wire
Signal path
Core thickness or material thickness on both sides of the line
The dielectric constant of the core or material
Distance from the copper plane
Presence of solder resist
Circuit board designers need to realize that their choice of conductors will directly affect the target impedance value. Many advanced tools are available to help with this calculation, which we will discuss later in the article.
