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Note
If you chose User Defined Zo in the previous step, the Per Length Unit and the
Differential Impedance are the only values that appear in the Calculation Results area
of the PCB Differential Impedance Calculator dialog and the Results tab when you click
Calculate.
© National Instruments Corporation
3.
In the Input Data area, edit the following fields as desired:
•
Input Length Unit—Select mils or millimeters.
•
Dielectric Height (H1)—Refer to the figure below.
•
Dielectric Height (H)—Refer to the figure below.
•
Trace Thickness (T)—Refer to the figure below.
•
Trace Width (W)—Refer to the figure below.
•
Trace Spacing (S)—Refer to the figure below.
•
Relative Permittivity (epsilon r)—Refer to the figure below.
Or
If you wish to define the Characteristic Impedance (Zo) yourself, click
User Defined Zo and edit the following fields as desired:
•
Input Length Unit—Select mils or millimeters.
•
Dielectric Thickness (H)—Refer to the figure below.
•
Trace Spacing (S)—Refer to the figure below.
•
Characteristic Impedance (Zo)—Refer to the figure below.
4.
Click Calculate. Results of the calculation appear in the Calculation
Results area. They also appear in the Results tab of the Spreadsheet
View.
5.
Click Close to close the PCB Differential Impedance Calculator.
6-13
Chapter 6
PCB Calculators
NI Ultiboard User Manual
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