Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide parameter is now Tools ⇒ Add Dimension Parameter ⇒ Add Anchored and to add a symmetric dimension parameter is Tools ⇒ Add Dimension Parameter ⇒ Add Symmetric. For details about the new variables feature and how they relate to dimension parameters, please refer to Chapter 10, “Parameterizing your Project” on page 129. Highlighting in 3D View: Enhancements have been done in the 3D view to highlight the metal levels and dielectric layers. Menu Name Change in the Current Density Viewer: The Parameters menu in the current density viewer has been changed to the Plot menu in release 12. 28
Chapter 3 Subsectioning Chapter 3 Subsectioning The Sonnet subsectioning is based on a uniform mesh indicated by the small dots in the project editor screen. The small dots are placed at the corners of a “cell”. One or more cells are automatically combined together to create subsections. Cells may be square or rectangular (any aspect ratio), but must be the same over your entire circuit. The cell size is specified in the project editor in the Box Settings dialog box which is opened by selecting Circuit ⇒ Box. The analysis solves for the current on each subsection. Since multiple cells are combined together into a single subsection, the number of subsections is usually considerably smaller than the number of cells. This is important because the analysis solves an N x N matrix where N is the number of subsections. A small reduction in the value of N results in a large reduction in analysis time and memory. Care must be taken in combining the cells into subsections so that accuracy is not sacrificed. Em automatically places small subsections in critical areas where current density is changing rapidly, but allows larger subsections in less critical areas, where current density is smooth or changing slowly. However, in some cases you may wish to modify the automatic algorithm because you want a faster, less accurate solution, or a slower, more accurate solution, than is provided by the automatic algorithm. Also, in some cases, you may have knowledge about your circuit that the software does not. For example, you may know that there is very little current on a certain area of your metal. Or you may have chosen a small cell size because you have a small dimension in your circuit, but 29
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