Why Sonnet needs 170GB MemoryWhen I do simulation

[CQCQ]

Hi,I'm using sonnet to simulate a mmic chip,the cell size is 5umx5um,while the solver displayed its needs 170GB Memory ! I was using momentum to simulate it successful and only needs 22GB memory with 100cells/wavelength setting.

 

[volker@muehlhaus]

Hi,I'm using sonnet to simulate a mmic chip,the cell size is 5umx5um,while the solver displayed its needs 170GB Memory ! I was using momentum to simulate it successful and only needs 22GB memory with 100cells/wavelength setting.

The meshing of both solvers is fundamentally different, and Sonnet's mesh defaults to most accurate = most memory requirement.

In Sonnet, having a small cell size can cause inefficient mesh on diagonals/irregular shapes if you use staircase mesh. Switching to conformal mesh will give excellent results with much less memory on these diagonal lines. However, the solver will automatically switch back to staircase ar vias and discontiniuities.

In your model I see a lot of "green" vias along the egdes of polygons - what is that? This will result in inefficient staircase mesh, so I think this is your main issue. If you use that for manual thick metal modelling, that's wrong because you should use the thick metal model instead (=compatible with conformal mesh). If you all these edge vias for stacking multiple layers, there are better ways to place the vias. You should really contact Sonnet support, they can help you to define a better model with much reduced memory requirement.