2D Extractor: stripline analysis

This example shows how you can use PyAEDT to create a differential stripline design in 2D Extractor and run a simulation.

Perform required imports

Perform required imports.

import os
import pyaedt

Set non-graphical mode

Set non-graphical mode. You can set non_graphical either to True or False.

non_graphical = False
project_path = pyaedt.generate_unique_project_name()

Launch AEDT and 2D Extractor

Launch AEDT 2023 R2 in graphical mode and launch 2D Extractor. This example uses SI units.

q = pyaedt.Q2d(projectname=project_path,
               designname="differential_stripline",
               specified_version="2023.2",
               non_graphical=non_graphical,
               new_desktop_session=True
               )

Initializing new desktop!

Define variables

Define variables.

e_factor = "e_factor"
sig_w = "sig_bot_w"
sig_gap = "sig_gap"
co_gnd_w = "gnd_w"
clearance = "clearance"
cond_h = "cond_h"
core_h = "core_h"
pp_h = "pp_h"

for var_name, var_value in {
    "e_factor": "2",
    "sig_bot_w": "150um",
    "sig_gap": "150um",
    "gnd_w": "500um",
    "clearance": "150um",
    "cond_h": "17um",
    "core_h": "150um",
    "pp_h": "150um",

}.items():
    q[var_name] = var_value

delta_w_half = "({0}/{1})".format(cond_h, e_factor)
sig_top_w = "({1}-{0}*2)".format(delta_w_half, sig_w)
co_gnd_top_w = "({1}-{0}*2)".format(delta_w_half, co_gnd_w)
model_w = "{}*2+{}*2+{}*2+{}".format(co_gnd_w, clearance, sig_w, sig_gap)

Create primitives

Create primitives and define the layer heights.

layer_1_lh = 0
layer_1_uh = cond_h
layer_2_lh = layer_1_uh + "+" + core_h
layer_2_uh = layer_2_lh + "+" + cond_h
layer_3_lh = layer_2_uh + "+" + pp_h
layer_3_uh = layer_3_lh + "+" + cond_h

Create positive signal

Create a positive signal.

base_line_obj = q.modeler.create_polyline([[0, layer_2_lh, 0], [sig_w, layer_2_lh, 0]], name="signal_p")
top_line_obj = q.modeler.create_polyline([[0, layer_2_uh, 0], [sig_top_w, layer_2_uh, 0]])
q.modeler.move([top_line_obj], [delta_w_half, 0, 0])
q.modeler.connect([base_line_obj, top_line_obj])
q.modeler.move([base_line_obj], ["{}+{}".format(co_gnd_w, clearance), 0, 0])

# Create negative signal
# ~~~~~~~~~~~~~~~~~~~~~~
# Create a negative signal.

base_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_lh, 0], [sig_w, layer_2_lh, 0]], name="signal_n")
top_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_uh, 0], [sig_top_w, layer_2_uh, 0]])
q.modeler.move(objid=[top_line_obj], vector=[delta_w_half, 0, 0])
q.modeler.connect([base_line_obj, top_line_obj])
q.modeler.move(objid=[base_line_obj], vector=["{}+{}+{}+{}".format(co_gnd_w, clearance, sig_w, sig_gap), 0, 0])

True

Create coplanar ground

Create a coplanar ground.

base_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_lh, 0], [co_gnd_w, layer_2_lh, 0]],
                                          name="co_gnd_left")
top_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_uh, 0], [co_gnd_top_w, layer_2_uh, 0]])
q.modeler.move([top_line_obj], [delta_w_half, 0, 0])
q.modeler.connect([base_line_obj, top_line_obj])

base_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_lh, 0], [co_gnd_w, layer_2_lh, 0]],
                                          name="co_gnd_right")
top_line_obj = q.modeler.create_polyline(position_list=[[0, layer_2_uh, 0], [co_gnd_top_w, layer_2_uh, 0]])
q.modeler.move(objid=[top_line_obj], vector=[delta_w_half, 0, 0])
q.modeler.connect([base_line_obj, top_line_obj])
q.modeler.move(objid=[base_line_obj],
               vector=["{}+{}*2+{}*2+{}".format(co_gnd_w, clearance, sig_w, sig_gap), 0, 0])

True

Create reference ground plane

Create a reference ground plane.

q.modeler.create_rectangle(position=[0, layer_1_lh, 0], dimension_list=[model_w, cond_h], name="ref_gnd_u")
q.modeler.create_rectangle(position=[0, layer_3_lh, 0], dimension_list=[model_w, cond_h], name="ref_gnd_l")

<pyaedt.modeler.cad.object3d.Object3d object at 0x000001D9AA278E50>

Create dielectric

Create a dielectric.

q.modeler.create_rectangle(
    position=[0, layer_1_uh, 0], dimension_list=[model_w, core_h], name="Core", matname="FR4_epoxy"
)
q.modeler.create_rectangle(
    position=[0, layer_2_uh, 0], dimension_list=[model_w, pp_h], name="Prepreg", matname="FR4_epoxy"
)
q.modeler.create_rectangle(
    position=[0, layer_2_lh, 0], dimension_list=[model_w, cond_h], name="Filling", matname="FR4_epoxy"
)

<pyaedt.modeler.cad.object3d.Object3d object at 0x000001D9A65AD1E0>

Assign conductors

Assign conductors to the signal.

obj = q.modeler.get_object_from_name("signal_p")
q.assign_single_conductor(
    name=obj.name, target_objects=[obj], conductor_type="SignalLine", solve_option="SolveOnBoundary", unit="mm"
)

obj = q.modeler.get_object_from_name("signal_n")
q.assign_single_conductor(
    name=obj.name, target_objects=[obj], conductor_type="SignalLine", solve_option="SolveOnBoundary", unit="mm"
)

<pyaedt.modules.Boundary.BoundaryObject object at 0x000001D9A65AC400>

Create reference ground

Create a reference ground.

obj = [q.modeler.get_object_from_name(i) for i in ["co_gnd_left", "co_gnd_right", "ref_gnd_u", "ref_gnd_l"]]
q.assign_single_conductor(
    name="gnd", target_objects=obj, conductor_type="ReferenceGround", solve_option="SolveOnBoundary", unit="mm"
)

<pyaedt.modules.Boundary.BoundaryObject object at 0x000001D9A65ADE40>

Assign Huray model on signals

Assign the Huray model on the signals.

obj = q.modeler.get_object_from_name("signal_p")
q.assign_huray_finitecond_to_edges(obj.edges, radius="0.5um", ratio=3, name="b_" + obj.name)

obj = q.modeler.get_object_from_name("signal_n")
q.assign_huray_finitecond_to_edges(obj.edges, radius="0.5um", ratio=3, name="b_" + obj.name)

<pyaedt.modules.Boundary.BoundaryObject object at 0x000001D9A65AD300>

Define differential pair

Define the differential pair.

matrix = q.insert_reduced_matrix(operation_name=q.MATRIXOPERATIONS.DiffPair, source_names=["signal_p", "signal_n"],
                                 rm_name="diff_pair")

Create setup, analyze, and plot

Create a setup, analyze, and plot solution data.

# Create a setup.
setup = q.create_setup(setupname="new_setup")

# Add a sweep.
sweep = setup.add_sweep(sweepname="sweep1", sweeptype="Discrete")
sweep.props["RangeType"] = "LinearStep"
sweep.props["RangeStart"] = "1GHz"
sweep.props["RangeStep"] = "100MHz"
sweep.props["RangeEnd"] = "5GHz"
sweep.props["SaveFields"] = False
sweep.props["SaveRadFields"] = False
sweep.props["Type"] = "Interpolating"
sweep.update()

# Analyze the nominal design and plot characteristic impedance.
q.analyze()
plot_sources = matrix.get_sources_for_plot(category="Z0")
a = q.post.get_solution_data(expressions=plot_sources, context=matrix.name)
a.plot(snapshot_path=os.path.join(q.working_directory, "plot.jpg")) # Save plot as jpg

# Add a parametric sweep and analyze.
parametric = q.parametrics.add(sweep_var="sig_bot_w", start_point=75, end_point=100, step=5,
                               variation_type="LinearStep")
parametric.add_variation(sweep_var="sig_gap", start_point="100um", end_point="200um", step=5,
                         variation_type="LinearCount")
q.analyze_setup(name=parametric.name)

True

Save project and release AEDT

Save the project and release AEDT.

q.save_project()
q.release_desktop()

True