Source code for kqcircuits.elements.airbridges.airbridge

# 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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from autologging import logged
from kqcircuits.pya_resolver import pya
from kqcircuits.util.geometry_helper import get_angle
from kqcircuits.util.parameters import Param, pdt
from kqcircuits.defaults import default_airbridge_type, default_layers
from kqcircuits.elements.airbridges import airbridge_type_choices
from kqcircuits.elements.element import Element, get_refpoints

[docs]@logged class Airbridge(Element): """Airbridge base class without actual produce function. All subclasses should have ports 'a' and 'b' at positions (0, bridge_length) and (0, -bridge_length). """ default_type = default_airbridge_type """This is the default shape if not specified otherwise by the user.""" airbridge_type = Param(pdt.TypeString, "Airbridge type", default_type, choices=airbridge_type_choices) bridge_width = Param(pdt.TypeDouble, "Bridge width", 20, unit="μm") pad_length = Param(pdt.TypeDouble, "Pad length", 18, unit="μm") bridge_length = Param(pdt.TypeDouble, "Bridge length (from pad to pad)", 44, unit="μm")
[docs] @classmethod def create(cls, layout, library=None, airbridge_type=None, **parameters): """Create cell for an airbridge in layout.""" cell, code_generated = cls.create_subtype(layout, library, airbridge_type, **parameters) # transform cell to have 'port_a' at (0, l/2) and 'port_b' at (0, -l/2), where l is distance between ports if not code_generated: ref_points = get_refpoints(layout.layer(default_layers["refpoints"]), cell) center = (ref_points['port_a'] + ref_points['port_b']) / 2 orientation = get_angle(ref_points['port_a'] - ref_points['port_b']) cell.transform(pya.DCplxTrans(1.0, 90 - orientation, False, -center)) return cell
def _produce_bottom_pads(self, pts): shape = pya.DPolygon(pts) self.cell.shapes(self.get_layer("airbridge_pads")).insert(shape) # bottom layer lower pad self.cell.shapes(self.get_layer("airbridge_pads")).insert(pya.DTrans.M0 * shape) # protection layer self.cell.shapes(self.get_layer("ground_grid_avoidance")).insert(shape.sized(self.margin)) self.cell.shapes(self.get_layer("ground_grid_avoidance")).insert(pya.DTrans.M0 * shape.sized(self.margin)) # refpoints for connecting to waveguides self.add_port("a", pya.DPoint(0, self.bridge_length / 2), pya.DVector(0, 1)) self.add_port("b", pya.DPoint(0, -self.bridge_length / 2), pya.DVector(0, -1)) def _produce_top_pads_and_bridge(self, pts): shape = pya.DPolygon(pts) self.cell.shapes(self.get_layer("airbridge_flyover")).insert(shape)