signal integrity

Stripline PCB Differential Impedance

Computes the differential impedance of a coupled stripline trace pair using: Zdiff = 2 × Z0 × (1 − 0.347 × e^(−2.9 × s/h)), where Z0 is the single-ended characteristic impedance, s is the spacing between traces, and h is the dielectric height.

Inputs

Characteristic Impedance(Ω)

Single-ended characteristic impedance of each trace in ohms

Space Between Traces(mm)

Edge-to-edge spacing between the two traces in millimetres

Height of Trace(mm)

Height of the dielectric substrate in millimetres

Results

⚠Height of trace must be greater than zero

Differential Impedance—ΩDifferential impedance of the stripline trace pair in ohms