Support Forum

Problem with FastHenry

User
LayoutEditorFull
Wednesday 23rd May 2018
Attachments:
(only for registered users)
 Induc-example.lec
We did some inductance calculation using the extraction tool of the LayoutEditor. The results we get are magnitude smaller than expected, compared to when the standalone version of FastHenry is used. What went wrong?
J├╝rgen
LayoutEditorFull
Wednesday 23rd May 2018
Attachments:
(only for registered users)

inductance.png

The current flow through a shape is very important for a inductance calculation. In the LayoutEditor it is assumed that the current flow is perpendicular to the drawing plane for polygons and parallel to the drawing plane for paths. In your drawing the shapes are all polygons, but i guess you have a current flow in the drawing plane. So you need to draw paths to get the expected results. With you example that will result in about 4 orders higher inductance. With the *Edit Input File* button in the extraction tool box you can always review the input the LayoutEditor generated for the FastHenry calculation. There you can also confirn, that you have set the correct thickness and level in the layer manager. ![inductance.png](/api/img.php?thread=20180523-2011&file=inductance.png)