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Power integrity analysis#

This example shows how to use the Ansys Electronics Database (EDB) for power integrity analysis. The EDB is loaded into HFSS 3D Layout for analysis and postprocessing.

Set up EDB consists of these steps:
- Assign S-parameter model to components.
- Create pin groups.
- Create ports.
- Create SIwave SYZ analysis.
- Create cutout.
Import EDB into HFSS 3D Layout:
- Analyze.
- Plot $Z_{11}$ .

Keywords: HFSS 3D Layout, power integrity.

Perform imports and define constants#

Import the required packages

[1]:

import json
import os
import tempfile
import time

import ansys.aedt.core
from ansys.aedt.core.examples.downloads import download_file

Define constants.

[2]:

AEDT_VERSION = "2025.2"
NUM_CORES = 4
NG_MODE = False  # Open AEDT UI when it is launched.

Create temporary directory#

Create a temporary directory where downloaded data or dumped data can be stored. If you’d like to retrieve the project data for subsequent use, the temporary folder name is given by temp_folder.name.

[3]:

temp_folder = tempfile.TemporaryDirectory(suffix=".ansys")

Download the example PCB data.

[4]:

aedb = download_file(source="edb/ANSYS-HSD_V1.aedb", local_path=temp_folder.name)
_ = download_file(
    source="touchstone",
    name="GRM32_DC0V_25degC_series.s2p",
    local_path=temp_folder.name,
)

Create configuration file#

This example uses a configuration file to set up the layout for analysis. Initialize and create an empty dictionary to host all configurations.

[5]:

cfg = dict()

Assigns S-parameter models to capacitors. The first step is to use the “general” key to specify where the S-parameter files can be found.

[6]:

cfg["general"] = {"s_parameter_library": os.path.join(temp_folder.name, "touchstone")}

Assign model to capactitors#

The model GRM32_DC0V_25degC_series.s2p is assigned to capacitors C3 and C4, which share the same component part number. When “apply_to_all” is True, all components having the part number “CAPC3216X180X20ML20” are assigned the S-parameter model.

[7]:

cfg["s_parameters"] = [
    {
        "name": "GRM32_DC0V_25degC_series",
        "component_definition": "CAPC0603X33X15LL03T05",
        "file_path": "GRM32_DC0V_25degC_series.s2p",
        "apply_to_all": False,
        "components": ["C110", "C206"],
        "reference_net": "GND",
        "reference_net_per_component": {"C110": "GND"},
    }
]

Create pin groups#

Pins can be grouped explicitly by the pin name, or pin groups can be assigned by net name using the ‘’net’’ key. The following code combine the listed pins on component U2 into two pin groups using the net key.

[8]:

cfg["pin_groups"] = [
    {
        "name": "PIN_GROUP_1",
        "reference_designator": "U1",
        "pins": ["AD14", "AD15", "AD16", "AD17"],
    },
    {"name": "PIN_GROUP_2", "reference_designator": "U1", "net": "GND"},
]

Create ports#

Create a circuit port between the two pin groups just created.

[9]:

cfg["ports"] = [
    {
        "name": "port1",
        "reference_designator": "U1",
        "type": "circuit",
        "positive_terminal": {"pin_group": "PIN_GROUP_1"},
        "negative_terminal": {"pin_group": "PIN_GROUP_2"},
    }
]

Create SIwave SYZ analysis setup#

Both SIwave and HFSS can be used to run an analysis in the 3D Layout user interface.

[10]:

cfg["setups"] = [
    {
        "name": "siwave_syz",
        "type": "siwave_ac",
        "pi_slider_position": 1,
        "freq_sweep": [
            {
                "name": "Sweep1",
                "type": "interpolation",
                "frequencies": [
                    {
                        "distribution": "log scale",
                        "start": 1e6,
                        "stop": 1e9,
                        "samples": 20,
                    }
                ],
            }
        ],
    }
]

Define cutout#

Define the region of the PCB to be cut out for analysis.

[11]:

cfg["operations"] = {
    "cutout": {
        "signal_list": ["1V0"],
        "reference_list": ["GND"],
        "extent_type": "ConvexHull",
        "expansion_size": 0.002,
        "use_round_corner": False,
        "output_aedb_path": "",
        "open_cutout_at_end": True,
        "use_pyaedt_cutout": True,
        "number_of_threads": 4,
        "use_pyaedt_extent_computing": True,
        "extent_defeature": 0,
        "remove_single_pin_components": False,
        "custom_extent": "",
        "custom_extent_units": "mm",
        "include_partial_instances": False,
        "keep_voids": True,
        "check_terminals": False,
        "include_pingroups": False,
        "expansion_factor": 0,
        "maximum_iterations": 10,
        "preserve_components_with_model": False,
        "simple_pad_check": True,
        "keep_lines_as_path": False,
    }
}

Save configuration#

Save the configuration file to a JSON file and apply it to layout data using the EDB.

[12]:

pi_json = os.path.join(temp_folder.name, "pi.json")
with open(pi_json, "w") as f:
    json.dump(cfg, f, indent=4, ensure_ascii=False)

Load configuration into EDB#

Load the configuration into EDB from the JSON file.

[13]:

edbapp = ansys.aedt.core.Edb(aedb, version=AEDT_VERSION)
edbapp.configuration.load(config_file=pi_json)
edbapp.configuration.run()
edbapp.save()
edbapp.close()

PyAEDT INFO: Loading EDB with Dotnet enabled.

C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pyedb\generic\design_types.py:302: UserWarning: This version of the Ansys Electronics Database (EDB) is compatible with the gRPCinterface. You can enable gRPC by passing ``grpc=True`` when instantiating the Edb object.For more information please check this link: https://edb.docs.pyansys.com/version/dev/grpc_api/index.html
  warnings.warn(GRPC_GENERAL_WARNING, UserWarning)

PyEDB INFO: Star initializing Edb 07:12:45.345245
PyEDB INFO: Edb version 2025.2
PyEDB INFO: Logger is initialized. Log file is saved to C:\Users\ansys\AppData\Local\Temp\pyedb_ansys.log.
PyEDB INFO: legacy v0.69.0
PyEDB INFO: Python version 3.10.11 (tags/v3.10.11:7d4cc5a, Apr 5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]
PyEDB INFO: Database ANSYS-HSD_V1.aedb Opened in 2025.2
PyEDB INFO: Cell main Opened
PyEDB INFO: Builder was initialized.
PyEDB INFO: open_edb completed in 9.0644 seconds.
PyEDB INFO: EDB initialization completed in 9.1280 seconds.
PyEDB INFO: Updating nets finished. Time lapse 0:00:00
PyEDB INFO: Updating components finished. Time lapse 0:00:00
PyEDB INFO: Creating pin groups finished. Time lapse 0:00:00.538953
PyEDB INFO: Placing sources finished. Time lapse 0:00:00
PyEDB INFO: Applying materials finished. Time lapse 0:00:00
PyEDB INFO: Updating stackup finished. Time lapse 0:00:00
PyEDB INFO: Applying padstack definitions and instances completed in 0.0000 seconds.
PyEDB INFO: Applying S-parameters finished. Time lapse 0:00:00.027689
PyEDB INFO: Applying package definitions finished. Time lapse 0:00:00
PyEDB INFO: Applying modeler finished. Time lapse 0:00:00
PyEDB INFO: Placing ports finished. Time lapse 0:00:00
PyEDB INFO: Placing terminals completed in 0.0000 seconds.
PyEDB INFO: Placing probes finished. Time lapse 0:00:00
PyEDB INFO: -----------------------------------------
PyEDB INFO: Trying cutout with (0.002)*(1000.0)mm expansion size
PyEDB INFO: -----------------------------------------
PyEDB INFO: Cutout Multithread started.

C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pydantic\main.py:464: UserWarning: Pydantic serializer warnings:
  PydanticSerializationUnexpectedValue(Unexpected Value)
  PydanticSerializationUnexpectedValue(Expected `str` - serialized value may not be as expected [field_name='resistor_below', input_value=100, input_type=int])
  PydanticSerializationUnexpectedValue(Unexpected Value)
  PydanticSerializationUnexpectedValue(Expected `str` - serialized value may not be as expected [field_name='inductor_below', input_value=1, input_type=int])
  return self.__pydantic_serializer__.to_python(

PyEDB INFO: Net clean up Elapsed time: 0m 1sec
PyEDB INFO: Extent Creation Elapsed time: 0m 0sec
PyEDB INFO: 1310 Padstack Instances deleted. Elapsed time: 0m 1sec
PyEDB INFO: 265 Primitives deleted. Elapsed time: 0m 2sec
PyEDB INFO: 702 components deleted
PyEDB INFO: Cutout completed. Elapsed time: 0m 4sec
PyEDB INFO: EDB file save completed in 0.0790 seconds.
PyEDB INFO: Cutout completed in 1 iterations with expansion size of (0.002)*(1000.0)mm Elapsed time: 0m 4sec
PyEDB INFO: Applying operations completed in 4.5072 seconds.
PyEDB INFO: Applying setups completed in 0.3159 seconds.
PyEDB INFO: Save Edb file completed in 0.0675 seconds.
PyEDB INFO: Close Edb file completed in 0.0747 seconds.

[13]:

True

The configured EDB file is saved in the temporary folder.

[14]:

print(temp_folder.name)

C:\Users\ansys\AppData\Local\Temp\tmponz4aofx.ansys

Analyze in HFSS 3D Layout#

Load EDB into HFSS 3D Layout#

[15]:

h3d = ansys.aedt.core.Hfss3dLayout(aedb, version=AEDT_VERSION, non_graphical=NG_MODE, new_desktop=True)

PyAEDT INFO: Python version 3.10.11 (tags/v3.10.11:7d4cc5a, Apr  5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)].
PyAEDT INFO: PyAEDT version 0.26.dev0.
PyAEDT INFO: Initializing new Desktop session.
PyAEDT INFO: AEDT version 2025.2.
PyAEDT INFO: New AEDT session is starting on gRPC port 62445.
PyAEDT INFO: Starting new AEDT gRPC session on port 62445.
PyAEDT INFO: Launching AEDT server with gRPC transport mode: wnua
PyAEDT INFO: Electronics Desktop started on gRPC port 62445 after 10.8 seconds.
PyAEDT INFO: AEDT installation Path C:\Program Files\ANSYS Inc\v252\AnsysEM
PyAEDT INFO: Connected to AEDT gRPC session on port 62445.
PyAEDT WARNING: Service Pack is not detected. PyAEDT is currently connecting in Insecure Mode.
PyAEDT WARNING: Please download and install latest Service Pack to use connect to AEDT in Secure Mode.
PyAEDT INFO: EDB folder C:\Users\ansys\AppData\Local\Temp\tmponz4aofx.ansys\edb\ANSYS-HSD_V1.aedb has been imported to project ANSYS-HSD_V1
PyAEDT INFO: Active Design set to 0;main
PyAEDT INFO: Active Design set to 0;main
PyAEDT INFO: AEDT objects correctly read

Analyze#

[16]:

h3d.analyze(cores=NUM_CORES)

PyAEDT INFO: Project ANSYS-HSD_V1 Saved correctly
PyAEDT INFO: Key Desktop/ActiveDSOConfigurations/HFSS 3D Layout Design correctly changed.
PyAEDT INFO: Solving all design setups. Analysis started...
PyAEDT INFO: Design setup None solved correctly in 0.0h 0.0m 40.0s
PyAEDT INFO: Key Desktop/ActiveDSOConfigurations/HFSS 3D Layout Design correctly changed.

[16]:

True

Plot impedance#

[17]:

solutions = h3d.post.get_solution_data(expressions="Z(port1,port1)")
solutions.plot()

PyAEDT INFO: Parsing C:\Users\ansys\AppData\Local\Temp\tmponz4aofx.ansys\edb\ANSYS-HSD_V1.aedt.
PyAEDT INFO: File C:\Users\ansys\AppData\Local\Temp\tmponz4aofx.ansys\edb\ANSYS-HSD_V1.aedt correctly loaded. Elapsed time: 0m 0sec
PyAEDT INFO: aedt file load time 0.2943844795227051
PyAEDT INFO: PostProcessor class has been initialized! Elapsed time: 0m 0sec
PyAEDT INFO: Post class has been initialized! Elapsed time: 0m 0sec
PyAEDT INFO: Loading Modeler.
PyAEDT INFO: Modeler loaded.
PyAEDT INFO: Modeler class has been initialized! Elapsed time: 0m 0sec
PyAEDT INFO: Loading EDB with Dotnet enabled.
PyEDB INFO: Star initializing Edb 07:14:06.837093
PyEDB INFO: Edb version 2025.2
PyEDB INFO: Logger is initialized. Log file is saved to C:\Users\ansys\AppData\Local\Temp\pyedb_ansys.log.
PyEDB INFO: legacy v0.69.0
PyEDB INFO: Python version 3.10.11 (tags/v3.10.11:7d4cc5a, Apr  5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]
PyEDB INFO: Database ANSYS-HSD_V1.aedb Opened in 2025.2
PyEDB INFO: Cell main Opened
PyEDB INFO: Builder was initialized.
PyEDB INFO: open_edb completed in 0.1458 seconds.
PyEDB INFO: EDB initialization completed in 0.1458 seconds.
PyAEDT WARNING: No report category provided. Automatically identified Standard

C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pyedb\generic\design_types.py:302: UserWarning: This version of the Ansys Electronics Database (EDB) is compatible with the gRPCinterface. You can enable gRPC by passing ``grpc=True`` when instantiating the Edb object.For more information please check this link: https://edb.docs.pyansys.com/version/dev/grpc_api/index.html
  warnings.warn(GRPC_GENERAL_WARNING, UserWarning)

PyAEDT INFO: Solution Data Correctly Loaded.
Time to initialize solution data:0.0
Time to initialize solution data:0.0

[17]:

../../../../_images/examples_high_frequency_layout_power_integrity_power_integrity_36_3.png

../../../../_images/examples_high_frequency_layout_power_integrity_power_integrity_36_4.png

Release AEDT#

[18]:

h3d.save_project()
h3d.release_desktop()
# Wait 3 seconds to allow AEDT to shut down before cleaning the temporary directory.
time.sleep(3)

PyAEDT INFO: Project ANSYS-HSD_V1 Saved correctly
PyAEDT INFO: Desktop has been released and closed.

Clean up#

All project files are saved in the folder temp_folder.name. If you’ve run this example as a Jupyter notebook, you can retrieve those project files. The following cell removes all temporary files, including the project folder.

[19]:

temp_folder.cleanup()

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