SimulationConfiguration

class pyedb.dotnet.edb_core.edb_data.simulation_configuration.SimulationConfiguration(filename=None, edb=None)

Provides an ASCII simulation configuration file parser.

This parser supports all types of inputs for setting up and automating any kind of SI or PI simulation with HFSS 3D Layout or Siwave. If fields are omitted, default values are applied. This class can be instantiated directly from Configuration file.

Examples

This class is very convenient to build HFSS and SIwave simulation projects from layout. It is leveraging EDB commands from Pyaedt but with keeping high level parameters making more easy PCB automation flow. SYZ and DC simulation can be addressed with this class.

The class is instantiated from an open edb:

>>> from pyedb import Edb
>>> edb = Edb()
>>> sim_setup = edb.new_simulation_configuration()

The returned object sim_setup is a SimulationConfiguration object. From this class you can assign a lot of parameters related the project configuration but also solver options. Here is the list of parameters available:

>>> from dotnet.generic.constants import SolverType
>>> sim_setup.solver_type = SolverType.Hfss3dLayout

Solver type can be selected, HFSS 3D Layout and Siwave are supported.

>>> sim_setup.signal_nets = ["net1", "net2"]

Set the list of net names you want to include for the simulation. These nets will have excitations ports created if corresponding pins are found on selected component. We usually refer to signal nets but power / reference nets can also be passed into this list if user wants to have ports created on these ones.

>>> sim_setup.power_nets = ["gnd", "vcc"]

Set the list on power and reference nets. These nets won’t have excitation ports created on them and will be clipped during the project build if the cutout option is enabled.

>>> sim_setup.components = ["comp1", "comp2"]

Set the list of components which will be included in the simulation. These components will have ports created on pins belonging to the net list.

>>> sim_setup.do_cutout_subdesign = True

When true activates the layout cutout based on net signal net selection and cutout expansion.

>>> from dotnet.generic.constants import CutoutSubdesignType
>>> sim_setup.cutout_subdesign_type = CutoutSubdesignType.Conformal

Define the type of cutout used for computing the clippingextent polygon. CutoutSubdesignType.Conformal CutoutSubdesignType.BBox are surpported.

>>> sim_setup.cutout_subdesign_expansion = "4mm"

Define the distance used for computing the extent polygon. Integer or string can be passed. For example 0.001 is in meter so here 1mm. You can also pass the string “1mm” for the same result.

>>> sim_setup.cutout_subdesign_round_corner = True

Boolean to allow using rounded corner for the cutout extent or not.

>>> sim_setup.use_default_cutout = False

When True use the native edb API command to process the cutout. Using False uses the Pyaedt one which improves the cutout speed.

>>> sim_setup.generate_solder_balls = True

Boolean to activate the solder ball generation on components. When HFSS solver is selected in combination with this parameter, coaxial ports will be created on solder balls for pins belonging to selected signal nets. If Siwave solver is selected this parameter will be ignored.

>>> sim_setup.use_default_coax_port_radial_extension = True

When True the default coaxial extent is used for the ports (only for HFSS). When the design is having dense solder balls close to each other (like typically package design), the default value might be too large and cause port overlapping, then solver failure. To prevent this issue set this parameter to False will use a smaller value.

>>> sim_setup.output_aedb = r"C:    emp\my_edb.aedb"

Specify the output edb file after building the project. The parameter must be the complete file path. leaving this parameter blank will oervwritte the current open edb.

>>>  sim_setup.dielectric_extent = 0.01

Gives the dielectric extent after cutout, keeping default value is advised unless for very specific application.

>>> sim_setup.airbox_horizontal_extent = "5mm"

Provide the air box horizonzal extent values. Unitless float value will be treated as ratio but string value like “5mm” is also supported.

>>> sim_setup.airbox_negative_vertical_extent = "5mm"

Provide the air box negative vertical extent values. Unitless float value will be treated as ratio but string value like “5mm” is also supported.

>>> sim_setup.airbox_positive_vertical_extent = "5mm"

Provide the air box positive vertical extent values. Unitless float value will be treated as ratio but string value like “5mm” is also supported.

>>> sim_setup.use_radiation_boundary = True

When True use radiation airbox boundary condition and perfect metal box when set to False. Default value is True, using enclosed metal box will greatly change simulation results. Setting this parameter as False must be used cautiously.

>>> sim_setup.do_cutout_subdesign = True

True activates the cutout with associated parameters. Setting False will keep the entire layout. Setting to False can impact the simulation run time or even memory failure if HFSS solver is used.

>>> sim_setup.do_pin_group = False

When circuit ports are used, setting to True will force to create pin groups on components having pins belonging to same net. Setting to False will generate port on each signal pin with taking the closest reference pin. The last configuration is more often used when users are creating ports on PDN (Power delivery Network) and want to connect all pins individually.

>>> from dotnet.generic.constants import SweepType
>>> sim_setup.sweep_type = SweepType.Linear

Specify the frequency sweep type, Linear or Log sweep can be defined.

SimulationCOnfiguration also inherit from SimulationConfigurationAc class for High frequency settings.

>>> sim_setup.start_freq = "OHz"

Define the start frequency from the sweep.

>>> sim_setup.stop_freq = "40GHz"

Define the stop frequency from the sweep.

>>> sim_setup.step_freq = "10MHz"

Define the step frequency from the sweep.

>>> sim_setup.decade_count = 100

Used when log sweep is defined and specify the number of points per decade.

>>> sim_setup.enforce_causality = True

Activate the option Enforce Causality for the solver, recommended for signal integrity application

>>> sim_setup.enforce_passivity = True

Activate the option Enforce Passivity for the solver, recommended for signal integrity application

>>> sim_setup.do_lambda_refinement = True

Activate the lambda refinement for the initial mesh (only for HFSS), default value is True. Keeping this activated is highly recommended.

>>> sim_setup.use_q3d_for_dc = False

Enable when True the Q3D DC point computation. Only needed when very high accuracy is required for DC point. Can eventually cause extra computation time.

>>> sim_setup.sweep_name = "Test_sweep"

Define the frequency sweep name.

>>> sim_setup.mesh_freq = "10GHz"

Define the frequency used for adaptive meshing (available for both HFSS and SIwave).

>>> from dotnet.generic.constants import RadiationBoxType
>>> sim_setup.radiation_box = RadiationBoxType.ConvexHull

Defined the radiation box type, Conformal, Bounding box and ConvexHull are supported (HFSS only).

>>> sim_setup.max_num_passes= 30

Default value is 30, specify the maximum number of adaptive passes (only HFSS). Reasonable high value is recommended to force the solver reaching the convergence criteria.

>>> sim_setup.max_mag_delta_s = 0.02

Define the convergence criteria

>>> sim_setup.min_num_passes = 2

specify the minimum number of consecutive coberged passes. Setting to 2 is a good practice to avoid converging on local minima.

>>> from dotnet.generic.constants import BasisOrder
>>> sim_setup.basis_order =  BasisOrder.Single

Select the order basis (HFSS only), Zero, Single, Double and Mixed are supported. For Signal integrity Single or Mixed should be used.

>>> sim_setup.minimum_void_surface = 0

Only for Siwave, specify the minimum void surface to be meshed. Void with lower surface value will be ignored by meshing.

SimulationConfiguration also inherits from SimulationDc class to handle DC simulation projects.

>>> sim_setup.dc_compute_inductance = True

True activate the DC loop inductance computation (Siwave only), False is deactivated.

>>> sim_setup.dc_slide_position = 1

The provided value must be between 0 and 2 and correspond ti the SIwave DC slide position in GUI. 0 : coarse 1 : medium accuracy 2 : high accuracy

>>> sim_setup.dc_plot_jv = True

True activate the current / voltage plot with Siwave DC solver, False deactivate.

>>> sim_setup.dc_error_energy = 0.02

Fix the DC error convergence criteria. In this example 2% is defined.

>>> sim_setup.dc_max_num_pass = 6

Provide the maximum number of passes during Siwave DC adaptive meshing.

>>> sim_setup.dc_min_num_pass = 1

Provide the minimum number of passes during Siwave DC adaptive meshing.

>>> sim_setup.dc_mesh_bondwires = True

True bondwires are meshed, False bond wires are ignored during meshing.

>>> sim_setup.dc_num_bondwire_sides = 8

Gives the number of facets wirebonds are discretized.

>>> sim_setup.dc_refine_vias = True

True meshing refinement on nondwires activated during meshing process. Deactivated when set to False.

>>> sim_setup.dc_report_show_Active_devices = True

Activate when True the components showing in the DC report.

>>> sim_setup.dc_export_thermal_data = True

True thermal data are exported for Icepak simulation.

>>> sim_setup.dc_full_report_path = r"C:    emp\my_report.html"

Provides the file path for the DC report.

>>> sim_setup.dc_icepak_temp_file = r"C:    emp\my_file"

Provides icepak temporary files location.

>>> sim_setup.dc_import_thermal_data = False

Import DC thermal data when True`

>>> sim_setup.dc_per_pin_res_path = r"C:    emp\dc_pin_res_file"
Provides the resistance per pin file path.

>>> sim_setup.dc_per_pin_use_pin_format = True

When True activate the pin format.

>>> sim_setup.dc_use_loop_res_for_per_pin = True

Activate the loop resistance usage per pin when True

>>> sim_setup.dc_via_report_path = 'C:\temp\via_report_file'

Define the via report path file.

>>> sim_setup.add_current_source(name="test_isrc",
>>>                                 current_value=1.2,
>>>                                 phase_value=0.0,
>>>                                 impedance=5e7,
>>>                                 positive_node_component="comp1",
>>>                                 positive_node_net="net1",
>>>                                 negative_node_component="comp2",
>>>                                 negative_node_net="net2"
>>>                             )

Define a current source.

>>> sim_setup.add_dc_ground_source_term(source_name="test_isrc", node_to_ground=1)

Define the pin from a source which has to be set to reference for DC simulation.

>>> sim_setup.add_voltage_source(name="test_vsrc",
>>>                                 current_value=1.33,
>>>                                 phase_value=0.0,
>>>                                 impedance=1e-6,
>>>                                 positive_node_component="comp1",
>>>                                 positive_node_net="net1",
>>>                                 negative_node_component="comp2",
>>>                                 negative_node_net="net2"
>>>                             )

Define a voltage source.

>>> sim_setup.add_dc_ground_source_term(source_name="test_vsrc", node_to_ground=1)

Define the pin from a source which has to be set to reference for DC simulation.

>>> edb.build_simulation_project(sim_setup)

Will build and save your project.

Methods

SimulationConfiguration.add_current_source([...])	Add a current source for the current SimulationConfiguration instance.
SimulationConfiguration.add_dc_ground_source_term([...])	Add a dc ground source terminal for Siwave.
SimulationConfiguration.add_rlc([name, ...])	Add a voltage source for the current SimulationConfiguration instance.
SimulationConfiguration.add_voltage_source([...])	Add a voltage source for the current SimulationConfiguration instance.
SimulationConfiguration.build_simulation_project()	Build active simulation project.
SimulationConfiguration.export_json(output_file)	Export Json file from SimulationConfiguration object.
SimulationConfiguration.import_json(input_file)	Import Json file into SimulationConfiguration object instance.

Attributes

SimulationConfiguration.ac_settings	AC Settings class.
SimulationConfiguration.batch_solve_settings	Cutout and Batch Settings class.
SimulationConfiguration.dc_settings	DC Settings class.
SimulationConfiguration.filename	Retrieve the file name loaded for mapping properties value.
SimulationConfiguration.open_edb_after_build	Either if open the Edb after the build or not.
SimulationConfiguration.setup_name	Retrieve setup name for the simulation.
SimulationConfiguration.solver_type	Retrieve the SolverType class to select the solver to be called during the project build.