# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with this program. If not, see
# https://www.gnu.org/licenses/gpl-3.0.html.
#
# The software distribution should follow IQM trademark policy for open-source software
# (meetiqm.com/iqm-open-source-trademark-policy). IQM welcomes contributions to the code.
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import math
import numpy
from kqcircuits.elements.tsvs.tsv import Tsv
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt
[docs]
class TsvEllipse(Tsv):
"""Connector between faces of two sides of a substrate.
Origin is at the geometric center. Geometry is elliptical.
.. MARKERS_FOR_PNG -0.2,0
"""
tsv_elliptical_width = Param(pdt.TypeDouble, "TSV elliptical width", 30, unit="μm")
[docs]
def produce_impl(self):
self.create_tsv_connector()
[docs]
def create_tsv_connector(self):
"""
Generate elliptical TSV
"""
# shorthand
r = self.tsv_diameter / 2
w = self.tsv_elliptical_width / 2
n = self.n
# parametric representation is taken from https://en.wikipedia.org/wiki/Superellipse
p1 = 6
p2 = 2
tsv_pts = [
pya.DPoint(
numpy.abs(math.cos(a)) ** (2 / p1) * w * numpy.sign(math.cos(a)),
numpy.abs(math.sin(a)) ** (2 / p2) * r * numpy.sign(math.sin(a)),
)
for a in (x / n * 2 * math.pi for x in range(0, n + 1))
]
tsv_region = pya.Region(pya.DPolygon(tsv_pts).to_itype(self.layout.dbu))
self.cell.shapes(self.get_layer("ground_grid_avoidance")).insert(
tsv_region.sized(self.tsv_margin / self.layout.dbu, self.tsv_margin / self.layout.dbu, 2)
)
self.cell.shapes(self.get_layer("ground_grid_avoidance", 1)).insert(
tsv_region.sized(self.tsv_margin / self.layout.dbu, self.tsv_margin / self.layout.dbu, 2)
)
self.cell.shapes(self.get_layer("through_silicon_via")).insert(tsv_region)
self.cell.shapes(self.get_layer("through_silicon_via", 1)).insert(tsv_region)