# 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.
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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# (meetiqm.com/iqm-open-source-trademark-policy). IQM welcomes contributions to the code.
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from kqcircuits.elements.element import Element
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt, add_parameters_from
from kqcircuits.elements.waveguide_coplanar import WaveguideCoplanar
[docs]
@add_parameters_from(WaveguideCoplanar, "add_metal")
class Launcher(Element):
"""The PCell declaration for a launcher for connecting wirebonds.
Default wirebond direction to west, waveguide to east. Uses default ratio ``a`` and ``b`` for
scaling the gap if ``a_launcher`` and ``b_launcher`` are not specified. Taper length is from
waveguide port to the rectangular part of the launcher pad. Pad width is also used for the
length of the launcher pad.
.. MARKERS_FOR_PNG 460,54 410,200 677,46 0,0,300,0
"""
s = Param(pdt.TypeDouble, "Pad width", 300, unit="μm")
l = Param(pdt.TypeDouble, "Tapering length", 300, unit="μm")
a_launcher = Param(pdt.TypeDouble, "Outer trace width", 240, unit="μm")
b_launcher = Param(pdt.TypeDouble, "Outer gap width", 144, unit="μm")
launcher_frame_gap = Param(pdt.TypeDouble, "Gap at chip frame", 144, unit="μm")
[docs]
def build(self):
# optical layer
# shape for the inner conductor
pts = [
pya.DPoint(0, self.a / 2 + 0),
pya.DPoint(self.l, self.a_launcher / 2),
pya.DPoint(self.l + self.s, self.a_launcher / 2),
pya.DPoint(self.l + self.s, -self.a_launcher / 2),
pya.DPoint(self.l, -self.a_launcher / 2),
pya.DPoint(0, -self.a / 2 + 0),
]
if self.add_metal:
self.cell.shapes(self.get_layer("base_metal_addition")).insert(pya.DPolygon(pts))
shifts = [
pya.DVector(0, self.b),
pya.DVector(0, self.b_launcher),
pya.DVector(self.launcher_frame_gap, self.b_launcher),
pya.DVector(self.launcher_frame_gap, -self.b_launcher),
pya.DVector(0, -self.b_launcher),
pya.DVector(0, -self.b),
]
pts2 = [p + s for p, s in zip(pts, shifts)]
pts.reverse()
shape = pya.DPolygon(pts + pts2)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid")).insert(shape)
# protection layer
shifts = [
pya.DVector(0, self.margin),
pya.DVector(0, self.margin),
pya.DVector(self.margin, self.margin),
pya.DVector(self.margin, -self.margin),
pya.DVector(0, -self.margin),
pya.DVector(0, -self.margin),
]
pts2 = [p + s for p, s in zip(pts2, shifts)]
shape = pya.DPolygon(pts2)
self.add_protection(shape)
# add reference point
self.add_port("", pya.DPoint(0, 0), pya.DVector(-1, 0))