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FAQ - Boxes in GDSII files

by Juergen Thies - 12 Dec 2009, 16:29 CET

The boxes are part of the GDSII
standard for many many years. But there are still some programs on the market, which not allow any box in a GDSII file. Even some founderies do not accept it. So it is sometime required to convert all boxes to polygon. This feature is available on the LayoutEditor in different ways:

Activating the option 'mainmenu/utilities/setup/fileformat/GDSII/box elements are saved as
polygons' will avoid the output of any box to the GDSII file.

Alternative you can do a semiautomatic conversion. Select all boxes and use
the feature 'mainmenu/utilities/convert uitlities/convert to polygon'. This
feature requieres the full version of the LayoutEditor.

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The LayoutEditor™ is a program to design and edit layouts for MEMS/IC fabrication and CMOS IC design .Designing these layouts require a high precision. In IC design a sufficient resolution and a possibility of a high scaling is required. The resolution of the LayoutEditor can be set in a wide range and is normally set to 1 nano meter. A higher resolution makes no sense due to atomar structures. With this resolution the LayoutEditor can draw elements up to 4 meters. In many IC design houses this is enough for IC/MEMS which extend usually less than 0.1 meters. The productions of MEMS/IC is done in many layers. For each of these physical CAD layers a belonging layer had to exist in the drawing. Additional logical layers are required for describing/naming purpose. So a lot of layers are needed. By default the LayoutEditor is limited to 128 layers. But it can easily be adjusted, if more layers are required. IC Designs often contain a plenty of repeating structures. Essential for micro fabrication of these designs is therefor a hierarchical design. This means, that the complete repeating structure only exists once in a single cell. These cell is then referred multiple times in the main drawing.
Beside the above mems packaging mentioned IC design fundaments it is important to have sophisticated functions to handle all drawing elements. The layout handler has all required functions: all basic design functions, all angle elements, boolean operations, macros, fontgenerator, design rule checker, mems tools, supported format: GDSII, DXF, OASIS, CIF. If you still missing a function, you are free to write a feature request

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