# 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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# (meetiqm.com/iqm-open-source-trademark-policy). IQM welcomes contributions to the code.
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from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt
from kqcircuits.junctions.junction import Junction
from kqcircuits.util.symmetric_polygons import polygon_with_vsym
[docs]
class Sim(Junction):
"""The PCell declaration for a simulation type SQUID.
Origin at the center of junction layer bottom edge.
"""
junction_total_length = Param(pdt.TypeDouble, "Simulation junction total length", 33, unit="µm")
junction_upper_pad_width = Param(pdt.TypeDouble, "Simulation junction upper metal pad width", 8, unit="µm")
junction_upper_pad_length = Param(pdt.TypeDouble, "Simulation junction upper metal pad length", 13, unit="µm")
junction_lower_pad_width = Param(pdt.TypeDouble, "Simulation junction lower metal pad width", 8, unit="µm")
junction_lower_pad_length = Param(pdt.TypeDouble, "Simulation junction lower metal pad length", 12, unit="µm")
include_background_gap = Param(pdt.TypeBoolean, "Add base metal gap below the junction", True)
[docs]
def build(self):
trans = pya.DTrans(0.0, 0.0)
self._produce_ground_metal_shapes(trans)
# refpoints
self.refpoints["origin_squid"] = pya.DPoint(0, 0)
self.refpoints["port_squid_a"] = pya.DPoint(0, self.junction_total_length - self.junction_upper_pad_length)
self.refpoints["port_squid_b"] = pya.DPoint(0, self.junction_lower_pad_length)
self.refpoints["port_common"] = pya.DPoint(0, self.junction_total_length)
def _produce_ground_metal_shapes(self, trans):
"""Produces shapes in base metal addition layer."""
# metal additions bottom
bottom_half_w = self.junction_lower_pad_width / 2
bottom_pts = [
pya.DPoint(-bottom_half_w, 0),
pya.DPoint(-bottom_half_w, self.junction_lower_pad_length),
pya.DPoint(bottom_half_w, self.junction_lower_pad_length),
pya.DPoint(bottom_half_w, 0),
]
shape = polygon_with_vsym(bottom_pts)
self.cell.shapes(self.get_layer("base_metal_addition")).insert(trans * shape)
# metal additions top
top_half_w = self.junction_upper_pad_width / 2
top_pts = [
pya.DPoint(-top_half_w, self.junction_total_length - self.junction_upper_pad_length),
pya.DPoint(-top_half_w, self.junction_total_length),
pya.DPoint(top_half_w, self.junction_total_length),
pya.DPoint(top_half_w, self.junction_total_length - self.junction_upper_pad_length),
]
shape = polygon_with_vsym(top_pts)
self.cell.shapes(self.get_layer("base_metal_addition")).insert(trans * shape)
# add ground grid avoidance
w = self.cell.dbbox().width()
h = self.cell.dbbox().height()
protection = pya.DBox(-w / 2 - self.margin, -self.margin, w / 2 + self.margin, h + self.margin)
self.add_protection(trans * protection)
if self.include_background_gap:
ground_gap = pya.DBox(-w / 2 - self.margin, 0, w / 2 + self.margin, h)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid")).insert(trans * ground_gap)