| W: | |
trace width |
| T: | trace thickness | |
| H (/H1) | height of trace or dielectric above return plane | |
| C: | distance between the differential stripline pair | |
| er: | relative permittivity of the dielectric |
Electrical Parameter Definitions
| Zo: | |
characteristic impedance |
| Zc: | effective characteristic impedance including the capacitance of distributed loads | |
| Tpd: | propagation delay | |
| Lo: | inductance per unit length | |
| Co: | capacitance per unit length |
Acknowledgements:
The source for formulas used in this calculator (except where otherwise
noted) is:
IPC-D-317A, Design Guidelines for Electronic Packaging
Utilizing High-Speed Techniques, Jan 1995; Section 5, pp. 13 - 36.
THESE FORMULAS ARE APPROXIMATIONS!
They should not be used when a
high degree of accuracy is required.