Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> 3 Select “Conformal” in the Fill Type drop list. 4 Click on the OK button to apply the changes and close the dialog box. The polygon does not appear any different in the circuit. To see the difference, you need to use the Analysis ⇒ Estimate Memory command. When the Estimate Memory dialog box appears, click on the View Subsections button. Shown below is the subsectioning for the same spiral inductor. The circuit on the left uses rectangular subsections and the one on the right uses conformal subsections. Note that the rectangular subsectioning uses a much higher number of subsections for the spiral inductor than does the conformal meshing. Rectangular subsectioning was used for the feed lines in both cases. Spiral inductor with rectangular subsections. (Default) Spiral inductor with conformal subsections. If you chose Conformal meshing, then the subsectioning controls in the Metalization Properties dialog box - Xmin, Ymin, XMax, YMax and Edge Mesh - are disabled and ignored. Conformal Meshing Rules Not all conditions which may affect accuracy or processing time are automatically identified in the project editor. Below are some basic rules for using conformal meshing you may follow to prevent causing an error in the analysis engine, em. 188
Chapter 12 Conformal Mesh Rule 1: Polygon Overlap Polygons should be drawn or moved in your circuit such that there is no overlap between polygons if any one of the polygons is using conformal meshing. It is possible for two polygons to overlap and not cause an error condition, but the most conservative use would be no overlaps. See the illustration below. The circuit on the left has three overlapping polygons and the polygon on the bottom is using conformal meshing. This would cause em to issue an error message and stop running. The circuit shown on the right has no overlap between polygons and would not cause any errors. TIP To maintain the same metal in your circuit without any overlap, use the Edit ⇒ Merge Polygons command on polygons which use the same metal type. Using the Merge command on the example above, in which all three polygons are the same metal type, is shown below. 189
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