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Design Rules for OpenCellLibrary

by anonymous - 9 Mar 2010, 20:07 CET

The opencelllibrary does not seem to satisfy design rules. For example, the distance between the gate and the metal contact seems to be much smaller than the gate length. and the spacing between the contact and the edge of metal also seem to be very small or non-existent. Is this an usable library? or am I mistaken?

by Juergen Thies - 9 Mar 2010, 20:38 CET

The Open Cell Library is created and maintained by Nangate ( http://www.nangate.com ). The LayoutEditor includes same parts of this library as an example implementation of a PDK. Please refer to the Nangate documentation for details on this library.

by anonymous - 10 Mar 2010, 8:44 CET

According to the nangate.com website, the Open Cell Library has been purposely designed to NOT be manufacturable.

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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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