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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_syz",
        "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, edbversion=AEDT_VERSION)
edbapp.configuration.load(config_file=pi_json)
edbapp.configuration.run()
edbapp.save()
edbapp.close()

C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pyedb\misc\decorators.py:33: UserWarning: Argument `edbversion` is deprecated for method `Edb`; use `version` instead.
  warnings.warn(
C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pyedb\generic\design_types.py:327: UserWarning: Your ANSYS AEDT version is eligible to gRPC version.You might consider switching to that version for better user experience.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 05:06:39.440213
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 v0.56.0
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 7.4318 seconds.
PyEDB INFO: EDB initialization completed in 7.4956 seconds.
PyEDB INFO: Updating boundaries finished. Time lapse 0:00:00.016179
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 0:00:00.522671
PyEDB INFO: Placing sources finished. Time lapse 0:00:00
PyEDB INFO: Creating setups finished. Time lapse 0:00:00.173738
PyEDB INFO: Applying materials finished. Time lapse 0:00:00
PyEDB INFO: Updating stackup finished. Time lapse 0:00:00
PyEDB INFO: Applying padstacks finished. Time lapse 0:00:00
PyEDB INFO: Applying S-parameters finished. Time lapse 0:00:00.016114
PyEDB INFO: Applying package definitions finished. Time lapse 0:00:00
PyEDB INFO: Applying modeler finished. Time lapse 0:00:00.538720
PyEDB INFO: Placing ports finished. Time lapse 0:00:00.016131
PyEDB INFO: Placing probes finished. Time lapse 0:00:00
PyEDB INFO: Cutout Multithread started.
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: Applying operations finished. Time lapse 0:00:04.365468
PyEDB INFO: Save Edb file completed in 0.0634 seconds.
PyEDB INFO: Close Edb file completed in 0.0790 seconds.

[13]:

True

The configured EDB file is saved in the temporary folder.

[14]:

print(temp_folder.name)

C:\Users\ansys\AppData\Local\Temp\tmpw63xjq9g.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 0.20.dev0.
PyAEDT INFO: Initializing new Desktop session.
PyAEDT INFO: Log on console is enabled.
PyAEDT INFO: Log on file C:\Users\ansys\AppData\Local\Temp\pyaedt_ansys_0468fff9-a996-446c-9e36-6fe317d3f79e.log is enabled.
PyAEDT INFO: Log on AEDT is disabled.
PyAEDT INFO: Debug logger is disabled. PyAEDT methods will not be logged.
PyAEDT INFO: Launching PyAEDT with gRPC plugin.
PyAEDT INFO: New AEDT session is starting on gRPC port 61014.
PyAEDT INFO: Electronics Desktop started on gRPC port: 61014 after 10.523322582244873 seconds.
PyAEDT INFO: AEDT installation Path C:\Program Files\ANSYS Inc\v252\AnsysEM
PyAEDT INFO: Ansoft.ElectronicsDesktop.2025.2 version started with process ID 4972.
PyAEDT INFO: EDB folder C:\Users\ansys\AppData\Local\Temp\tmpw63xjq9g.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 35.0s
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\tmpw63xjq9g.ansys\edb\ANSYS-HSD_V1.aedt.
PyAEDT INFO: File C:\Users\ansys\AppData\Local\Temp\tmpw63xjq9g.ansys\edb\ANSYS-HSD_V1.aedt correctly loaded. Elapsed time: 0m 0sec
PyAEDT INFO: aedt file load time 0.28353428840637207
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: EDB loaded.
PyAEDT INFO: Layers loaded.
PyAEDT INFO: Primitives loaded.
PyAEDT INFO: Modeler class has been initialized! Elapsed time: 0m 0sec
PyEDB INFO: Star initializing Edb 05:07:51.237257
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 v0.56.0
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 0.1322 seconds.
PyEDB INFO: EDB initialization completed in 0.1392 seconds.

C:\actions-runner\_work\pyaedt-examples\pyaedt-examples\.venv\lib\site-packages\pyedb\generic\design_types.py:327: UserWarning: Your ANSYS AEDT version is eligible to gRPC version.You might consider switching to that version for better user experience.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.

[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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