Planar EM Setup: Solver Tab
Click the Solver tab of the Add HFSS 3D Layout Solution Setup window to access the following settings.
General Options
- Use loop tree: the Moment Method basis functions are re-organized to provide low frequency solution accuracy and stability.
- Accuracy level: determines the level of precision of various computations in the simulation procedure. The default solution accuracy level is level 2, the usual recommended level. For very large solutions, accuracy level 1 is recommended. For more information see Setting the Solution Accuracy Level.
- Specialized design type:
— Generic: no special treatment by the engine.
— Spiral Inductor: the engine treats the currents on zero thickness signal layers as a volume current; the current on the vias transfers from one end to the other without consideration to the wire.
Modeling Options
- Signal layers thinner than <value> are modeled as zero thickness: negative signal layers in the design which are thinner than the given value are modeled as being infinitely thin in order to reduce simulation time.
- Dielectrics thinner than <value> are merged with an adjacent: dielectric layers in the design which are thinner than the given value are merged into an adjacent dielectric; material properties are accumulated using a weighted average.
Solver Type Selection
- Determines what matrix solver is used, based on the number of unknowns.
- Direct solver: use the direct matrix solver.
- Ansys MoM Fast Solver™: the Ansys “ method of moments” technology that is used to solve especially large matrix equations.
HPC Licensing Options
- If you are solving an HFSS 3D Layout Transient problem, the solver are checkout ensemble_solve (regular solve license). Only checkout a ensemble_transient_solve license. For HFSS 3D Layout Transient problems and HFSS 3D Layout array problems, always use HPC licenses for multiprocessing (even if you have NOT chosen the Use HPC licenses for multiprocessing and distributed frequency points option).
- For HFSS-IE problems, an ensembleie_solve license is required. For HFSS 3D Layout problems with radiation boundaries and Use HFSS 3D Layout Formulation checked, an ensembleie_solve license is required in addition to the ensemble_solve.
- Number of Machines: the number of machines listed in the Distributed Machine Configuration in the General Options.
- For multiprocessing and frequency sweeps, check Use HPC licenses for multiprocessing and distributed frequency points. This option also enables an additional check box, Enable distributed Optimetrics using DSO license.
- If you have a DSO license, checking Enable distributed Optimetrics using DSO License distributes at the highest level (distributing the variations), which is most efficient.
- If you have HPC and no DSO, clear the Enable distributed Optimetrics using DSO License option so that HPC can be used to distribute frequency sweeps in an Optimetrics solution.