Source code for kqcircuits.test_structures.test_structure

# 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/developers/osstmpolicy). IQM welcomes contributions to the code. Please see our contribution agreements
# for individuals (meetiqm.com/developers/clas/individual) and organizations (meetiqm.com/developers/clas/organization).


from kqcircuits.elements.element import Element
from kqcircuits.pya_resolver import pya


[docs] class TestStructure(Element): """Base PCell declaration for test structures.""" LIBRARY_NAME = "Test Structure Library" LIBRARY_DESCRIPTION = "Superconducting quantum circuit library for test structures." LIBRARY_PATH = "test_structures"
[docs] def produce_pad(self, x, y, pads_region, pad_width, pad_height): """Inserts a square pad shape to pads_region. Args: x: x-coordinate of the pad center y: y-coordinate of the pad center pads_region: Region to which the pad shape is inserted pad_width: width (and height) of the pad """ offset_x = pad_width / 2 offset_y = pad_height / 2 pad = pya.DPolygon( [ pya.DPoint(x - offset_x, y - offset_y), pya.DPoint(x - offset_x, y + offset_y), pya.DPoint(x + offset_x, y + offset_y), pya.DPoint(x + offset_x, y - offset_y), ] ) pads_region.insert(pad.to_itype(self.layout.dbu))
[docs] def produce_four_point_pads( self, pads_region, pad_width, pad_height, pad_spacing_x, pad_spacing_y, connect_pads, trans=pya.DTrans(), refpoint_prefix="probe", refpoint_distance=None, ): """Inserts four pads to pads_region. Args: pads_region: Region to which the pad shapes are inserted pad_width: width (and height) of the pads pad_spacing_x: x-distance between the pads pad_spacing_y: y-distance between the pads connect_pads: Boolean determining if the two pads on each side are connected trans: transformation applied to the pads refpoint_prefix: prefix used for the refpoint names refpoint_distance: Horizontal distance of refpoints from closest outer edges. If None, the refpoints will be at the center of the pads. """ pad_offset_x = (pad_spacing_x + pad_width) / 2 pad_offset_y = (pad_spacing_y + pad_height) / 2 pos_sw = pya.DPoint(trans.disp.x - pad_offset_x, trans.disp.y - pad_offset_y) pos_nw = pya.DPoint(trans.disp.x - pad_offset_x, trans.disp.y + pad_offset_y) pos_ne = pya.DPoint(trans.disp.x + pad_offset_x, trans.disp.y + pad_offset_y) pos_se = pya.DPoint(trans.disp.x + pad_offset_x, trans.disp.y - pad_offset_y) self.produce_pad(pos_sw.x, pos_sw.y, pads_region, pad_width, pad_height) self.produce_pad(pos_nw.x, pos_nw.y, pads_region, pad_width, pad_height) self.produce_pad(pos_ne.x, pos_ne.y, pads_region, pad_width, pad_height) self.produce_pad(pos_se.x, pos_se.y, pads_region, pad_width, pad_height) if connect_pads: pad_connection_box_width = 50 pad_connection_box = pya.DBox(pya.DPoint(0, 0), pya.DPoint(pad_connection_box_width, pad_spacing_y)) trans_left = pya.DTrans(-pad_spacing_x / 2 - pad_connection_box_width, -pad_spacing_y / 2) trans_right = pya.DTrans(pad_spacing_x / 2, -pad_spacing_y / 2) pads_region.insert((trans * trans_left * pad_connection_box).to_itype(self.layout.dbu)) pads_region.insert((trans * trans_right * pad_connection_box).to_itype(self.layout.dbu)) if refpoint_distance is None: self.refpoints["{}_sw".format(refpoint_prefix)] = pos_sw self.refpoints["{}_nw".format(refpoint_prefix)] = pos_nw self.refpoints["{}_ne".format(refpoint_prefix)] = pos_ne self.refpoints["{}_se".format(refpoint_prefix)] = pos_se else: self.refpoints["{}_sw".format(refpoint_prefix)] = pos_sw + pya.DVector( -pad_width / 2 + refpoint_distance, 0 ) self.refpoints["{}_nw".format(refpoint_prefix)] = pos_nw + pya.DVector( -pad_width / 2 + refpoint_distance, 0 ) self.refpoints["{}_ne".format(refpoint_prefix)] = pos_ne + pya.DVector(pad_width / 2 - refpoint_distance, 0) self.refpoints["{}_se".format(refpoint_prefix)] = pos_se + pya.DVector(pad_width / 2 - refpoint_distance, 0)
[docs] def produce_etched_region(self, metal_region, pos, width, height): """Produces structures in metal gap layer. Subtracts metal_region from a region defined by width and height, and inserts resulting region to metal gap layer. Also adds grid avoidance for the area. Args: metal_region: region subtracted from the region in metal gap layer pos: center of the produced region (pya.DPoint) width: width of the produced region height: height of the produced region """ test_area = pya.DPolygon( [ pya.DPoint(pos.x + width / 2, pos.y + height / 2), pya.DPoint(pos.x + width / 2, pos.y - height / 2), pya.DPoint(pos.x - width / 2, pos.y - height / 2), pya.DPoint(pos.x - width / 2, pos.y + height / 2), ] ) reg_test_area = pya.Region(test_area.to_itype(self.layout.dbu)) # etched region reg_etch = reg_test_area - metal_region self.cell.shapes(self.get_layer("base_metal_gap_wo_grid")).insert(reg_etch) # grid avoidance region reg_protect = reg_etch.extents(int(self.margin / self.layout.dbu)) self.cell.shapes(self.get_layer("ground_grid_avoidance")).insert(reg_protect)