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Primitive meshing settings and layout component

Question asked by CONRAD69 on Oct 25, 2003
Latest reply on Oct 27, 2003 by ALEPEREZ

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I am trying to create a layout component in ADS2002c and would like to spcify different mesh densities for different primitives in my layout, i.e, for lines and ground structures.
Even though I have the 'layout' button selected in the 'momentum simulation control' section of the components 'model' tab, when I run a schematic simulation using this component, it doesn't observe the primitive settings and seems to revert to some previous or default mesh setting.
Also, the mesh generates looks like 'crazy paving' instead of the regular pattern you usually achieve if pre-computing mesh directly through layout.

Any ideas ???

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ALEPEREZ

Oct 27, 2003 12:47 AM

It is true that this will not work. In the documentation, "Specifying Layout Component Instance Parameters" in chapter 6 of the Momentum Manual, you will find the definition of what this option "Layout" actually means. In fact, it does not give you the full control over the mesh settings despite what the UI may imply. You can only control the frequency sweep using that option, but mesh options remain defined only by the Momentum>Component>Create/Update menu command.

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CONRAD69 Oct 27, 2003 4:25 AM

Thanks for that. Is there any way then to control the meshing for differnet primitives ?? Is this the same in in ADS2003c ??

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ALEPEREZ

Oct 27, 2003 2:47 PM

One possibility you have is to simulate the geometry in Momentum instead of using cosimulation, and then use the "File Based" model option in the LC Edit dialog in the schematic (allowing you to at least reuse the symbol). Then primitive seeding will work within the general constraints the mesh maker makes on meshes (there are overruling algorithms in the mesher that you cannot override no matter what).

Or you can draw those primitives that you think require primitive meshing as individual pieces. Note that this may complicate your ability to parameterize a layout component, though.

In general, primitive meshing is not needed. There are very few cases where it is required such as for some TFR resistor layers.

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ALEPEREZ Oct 27, 2003 12:47 AM
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It is true that this will not work. In the documentation, "Specifying Layout Component Instance Parameters" in chapter 6 of the Momentum Manual, you will find the definition of what this option "Layout" actually means. In fact, it does not give you the full control over the mesh settings despite what the UI may imply. You can only control the frequency sweep using that option, but mesh options remain defined only by the Momentum>Component>Create/Update menu command.
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CONRAD69 Oct 27, 2003 4:25 AM
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Thanks for that. Is there any way then to control the meshing for differnet primitives ?? Is this the same in in ADS2003c ??
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ALEPEREZ Oct 27, 2003 2:47 PM
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One possibility you have is to simulate the geometry in Momentum instead of using cosimulation, and then use the "File Based" model option in the LC Edit dialog in the schematic (allowing you to at least reuse the symbol). Then primitive seeding will work within the general constraints the mesh maker makes on meshes (there are overruling algorithms in the mesher that you cannot override no matter what).

Or you can draw those primitives that you think require primitive meshing as individual pieces. Note that this may complicate your ability to parameterize a layout component, though.

In general, primitive meshing is not needed. There are very few cases where it is required such as for some TFR resistor layers.
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Primitive meshing settings and layout component

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