PCB Characteristic Impedance Formula
Equation for calculate pcb characteristic impedance is,
z = 87 / √(e + 1.41) × LN((5.98 x h) / (0.8 x w + t))
Where,
z = Characteristic Impedance
e = Relative Permittivity
h = Height of Dielectric
w = Width of Trace
t = Trace Thickness