Select a Configuration


Geometric Parameter Definitions
W 

trace width 
T 
trace thickness 
H (/H1) 
height of trace or dielectric above
return plane 
C 
distance between the differential
stripline pair 
ε_{r} 
relative permittivity of the
dielectric 
Electrical Parameter Definitions
Z_{0} 

characteristic impedance 
Z_{c} 
effective characteristic impedance
including the capacitance of distributed
loads 
T_{pd} 
propagation delay 
L_{0} 
inductance per unit length 
C_{0} 
capacitance per unit length 
Acknowledgements
The source for formulas used in
this calculator (except where otherwise noted) is
the Design Guide for Electronic Packaging
Utilizing HighSpeed Techniques (4th Working
Draft, IPC2251, February 2001.
THESE FORMULAS ARE
APPROXIMATIONS! They should not be used when a high
degree of accuracy is required.
This transmission line
calculator was based on a concept developed by
Douglas Brooks of UltraCAD Design,
Inc.
