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Signal Integrity Issues and Printed Circuit Board Design by Douglas Brooks

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Appendix H. UltraCad Freeware Calculators

UltraCAD Design, Inc. has developed several freeware calculators for people to use. They are all located on the UltraCAD Web site at www.ultracad.com/calcs.

This appendix describes three of them that are useful for signal integrity purposes. As a general warning, be sure to read the help file associated with each calculator before using it.

Impedance (Ultraclc.Exe)

This tool, shown in Figure H-1, can be used to determine the trace width, thickness, or stackup dimensions required to hit an impedance target, or it calculates the trace impedance given the other parameters. It gives helpful results for microstrip, embedded microstrip, stripline, and asymmetric stripline configurations. The calculations are based ...

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