Microstrip calculations, Microstrip calculations -8 – National Instruments Graphical User Interface Ultiboard User Manual
Page 191
Chapter 6
PCB Calculators
6-8
ni.com
You can use the PCB Differential Impedance Calculator to calculate the
following parameters for differential pairs:
•
Characteristic Impedance (Zo).
•
Per unit length Capacitance (Co).
•
Per unit length Inductance (Lo).
•
Propogation Delay (tpd).
•
Differential Impedance (Zdiff).
The PCB Differential Impedance Calculator supports:
•
•
Embedded Microstrip Calculations
•
Centered Stripline Calculations
.
•
Asymmetric Stripline Calculations
.
Microstrip Calculations
Complete the following steps to perform microstrip differential impedance
calculations:
1.
Select Tools»PCB Differential Impedance Calculator.
2.
Select Microstrip in the Type drop-down list.
3.
In the Input Data area, edit the following fields as desired:
•
Input Length Unit—Select mils or millimeters.
•
Dielectric Thickness (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.