micheleandCursor
6fc2ac583d
Use the vendored Hammerstad-Jensen/Cohn engine for microstrip, stripline, and coupled-diff advice. Skip OpenEMS/pcbnew and refuse CPWG rather than inventing a number. Co-authored-by: Cursor <cursoragent@cursor.com>
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
"""Synthetic fixtures for the pure engine — no board_model, no pcbnew."""
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from __future__ import annotations
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import pytest
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from impedancefinder.model import DielectricLayer, Point2D, Stackup, TraceSegment, ZonePolygon
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def rect(x0: float, y0: float, x1: float, y1: float) -> tuple[Point2D, ...]:
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return (Point2D(x0, y0), Point2D(x1, y0), Point2D(x1, y1), Point2D(x0, y1))
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@pytest.fixture
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def stackup_4layer() -> Stackup:
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return Stackup(
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copper_layer_names=("F.Cu", "In1.Cu", "In2.Cu", "B.Cu"),
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dielectrics=(
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DielectricLayer("prepreg_top", 4.3, 0.15),
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DielectricLayer("core", 4.4, 0.7),
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DielectricLayer("prepreg_bottom", 4.3, 0.15),
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),
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copper_thickness_mm=0.035,
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)
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@pytest.fixture
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def full_ground_plane() -> ZonePolygon:
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"""A ground pour on In1.Cu with no voids, spanning the whole test area."""
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return ZonePolygon(net="GND", layer="In1.Cu", outlines_mm=(rect(-5, -5, 50, 5),))
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@pytest.fixture
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def split_ground_plane() -> ZonePolygon:
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"""A ground pour on In1.Cu with a gap between x=4mm and x=6mm."""
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return ZonePolygon(
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net="GND",
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layer="In1.Cu",
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outlines_mm=(rect(-5, -5, 4, 5), rect(6, -5, 50, 5)),
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)
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@pytest.fixture
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def clean_run_segment() -> TraceSegment:
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return TraceSegment(net="SIG", layer="F.Cu", start=Point2D(0, 0), end=Point2D(10, 0), width_mm=0.2)
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@pytest.fixture
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def neckdown_segments() -> tuple[TraceSegment, ...]:
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"""A trace that narrows partway along its run."""
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return (
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TraceSegment(net="SIG", layer="F.Cu", start=Point2D(0, 0), end=Point2D(5, 0), width_mm=0.3),
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TraceSegment(net="SIG", layer="F.Cu", start=Point2D(5, 0), end=Point2D(10, 0), width_mm=0.12),
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)
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