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Circuit schematic creation and analysis

This example shows how to build a circuit schematic and run a transient circuit simulation.

Keywords: AEDT, Circuit, Schematic.

Import packages and define constants

Perform required imports.

import os
import tempfile
import time

import ansys.aedt.core

Define constants.

AEDT_VERSION = "2025.2"
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.

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

Launch AEDT with Circuit

Launch AEDT with Circuit. The pyaedt.Desktop class initializes AEDT and starts the specified version in the specified mode.

circuit = ansys.aedt.core.Circuit(
    project=os.path.join(temp_folder.name, "CircuitExample"),
    design="Simple",
    version=AEDT_VERSION,
    non_graphical=NG_MODE,
    new_desktop=True,
)

circuit.modeler.schematic.schematic_units = "mil"

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 0.22.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_5e9253f7-4e02-44fc-aa00-1631acd84259.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 52089.
PyAEDT INFO: Electronics Desktop started on gRPC port: 52089 after 11.248291492462158 seconds.
PyAEDT INFO: AEDT installation Path C:\Program Files\ANSYS Inc\v252\AnsysEM
PyAEDT INFO: Ansoft.ElectronicsDesktop.2025.2 version started with process ID 1776.
PyAEDT INFO: Project CircuitExample has been created.
PyAEDT INFO: Added design 'Simple' of type Circuit Design.
PyAEDT INFO: Aedt Objects correctly read
PyAEDT INFO: ModelerCircuit class has been initialized! Elapsed time: 0m 0sec
PyAEDT INFO: ModelerNexxim class has been initialized!
PyAEDT INFO: Modeler class has been initialized! Elapsed time: 0m 0sec

Create circuit setup

Create and customize a linear network analysis (LNA) setup.

setup1 = circuit.create_setup("MyLNA")
setup1.props["SweepDefinition"]["Data"] = "LINC 0GHz 4GHz 10001"

Place components

Place components such as an inductor, resistor, and capacitor. The location argument provides the [x, y] coordinates to place the component.

inductor = circuit.modeler.schematic.create_inductor(
    name="L1", value=1e-9, location=[0, 0]
)
resistor = circuit.modeler.schematic.create_resistor(
    name="R1", value=50, location=[500, 0]
)
capacitor = circuit.modeler.schematic.create_capacitor(
    name="C1", value=1e-12, location=[1000, 0]
)

Get all pins

The component pins are instances of the ansys.aedt.core.modeler.circuits.objct3dcircuit.CircuitPins class and provide access to the pin location, net connectivity, and the connect_to_component() method, which can be used to connect components in the schematic as demonstrated in this example.

Place a port and ground

Place a port and a ground in the schematic.

port = circuit.modeler.components.create_interface_port(
    name="myport", location=[-300, 50]
)
gnd = circuit.modeler.components.create_gnd(location=[1200, -100])

PyAEDT INFO: Parsing C:\Users\ansys\AppData\Local\Temp\tmpmsed_gfp.ansys\CircuitExample.aedt.
PyAEDT INFO: File C:\Users\ansys\AppData\Local\Temp\tmpmsed_gfp.ansys\CircuitExample.aedt correctly loaded. Elapsed time: 0m 0sec
PyAEDT INFO: aedt file load time 0.020918846130371094

Connect components

Connect components with wires in the schematic. The connect_to_component() method is used to create connections between pins.

port.pins[0].connect_to_component(assignment=inductor.pins[0], use_wire=True)
inductor.pins[1].connect_to_component(assignment=resistor.pins[1], use_wire=True)
resistor.pins[0].connect_to_component(assignment=capacitor.pins[0], use_wire=True)
capacitor.pins[1].connect_to_component(assignment=gnd.pins[0], use_wire=True)

True

Create transient setup

Create a transient setup.

setup2 = circuit.create_setup(
    name="MyTransient", setup_type=circuit.SETUPS.NexximTransient
)
setup2.props["TransientData"] = ["0.01ns", "200ns"]
setup3 = circuit.create_setup(name="MyDC", setup_type=circuit.SETUPS.NexximDC)

C:\Users\ansys\AppData\Local\Temp\ipykernel_7848\4117341070.py:2: DeprecationWarning: Usage of SETUPS is deprecated. Use ansys.aedt.core.generic.constants.Setups instead.
  name="MyTransient", setup_type=circuit.SETUPS.NexximTransient
C:\Users\ansys\AppData\Local\Temp\ipykernel_7848\4117341070.py:5: DeprecationWarning: Usage of SETUPS is deprecated. Use ansys.aedt.core.generic.constants.Setups instead.
  setup3 = circuit.create_setup(name="MyDC", setup_type=circuit.SETUPS.NexximDC)

Solve transient setup

Solve the transient setup.

circuit.analyze_setup("MyLNA")
circuit.export_fullwave_spice()

PyAEDT INFO: Solving design setup MyLNA
PyAEDT INFO: Design setup MyLNA solved correctly in 0.0h 0.0m 11.0s
PyAEDT INFO: FullWaveSpice correctly exported to C:\Users\ansys\AppData\Local\Temp\tmpmsed_gfp.ansys\CircuitExample.pyaedt\Simple\Simple.sp

WindowsPath('C:/Users/ansys/AppData/Local/Temp/tmpmsed_gfp.ansys/CircuitExample.pyaedt/Simple/Simple.sp')

Create report

Create a report displaying the scattering parameters.

solutions = circuit.post.get_solution_data(
    expressions=circuit.get_traces_for_plot(category="S"),
)
solutions.enable_pandas_output = True
real, imag = solutions.full_matrix_real_imag
print(real)

PyAEDT INFO: Post class has been initialized! Elapsed time: 0m 0sec
PyAEDT WARNING: No report category provided. Automatically identified Standard
PyAEDT INFO: Solution Data Correctly Loaded.
Time to initialize solution data:0.01637434959411621
Time to initialize solution data:0.03167319297790527
{'S(myport,myport)': array([[0.00000000e+00, 1.00000000e+00],
       [4.00000000e-04, 9.99999937e-01],
       [8.00000000e-04, 9.99999747e-01],
       ...,
       [3.99920000e+00, 2.10646321e-02],
       [3.99960000e+00, 2.10463797e-02],
       [4.00000000e+00, 2.10281371e-02]], shape=(10001, 2))}

Create plot

Create a plot based on solution data.

fig = solutions.plot()

Release AEDT

Release AEDT and close the example.

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

PyAEDT INFO: Project CircuitExample 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.

temp_folder.cleanup()

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Download this example

Download this example as a Jupyter Notebook or as a Python script.