# 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.util.geometry_helper import circle_polygon
from kqcircuits.util.parameters import Param, pdt
from kqcircuits.defaults import default_bump_parameters
[docs]
class FlipChipConnector(Element):
"""Connector between matching faces of two chips.
The connector makes a galvanic contact between the flipped over top chip and the bottom chip.
Origin is at the geometric center.
"""
ubm_diameter = Param(
pdt.TypeDouble, "Under-bump metalization diameter", default_bump_parameters["under_bump_diameter"], unit="μm"
)
bump_diameter = Param(pdt.TypeDouble, "Bump diameter", default_bump_parameters["bump_diameter"], unit="μm")
[docs]
def create_bump_connector(self):
ubm_shape = circle_polygon(self.ubm_diameter / 2, self.n)
self.cell.shapes(self.get_layer("underbump_metallization", 0)).insert(ubm_shape)
self.cell.shapes(self.get_layer("underbump_metallization", 1)).insert(ubm_shape)
avoidance_shape = circle_polygon(self.ubm_diameter / 2 + self.margin, self.n)
self.cell.shapes(self.get_layer("ground_grid_avoidance", 0)).insert(avoidance_shape)
self.cell.shapes(self.get_layer("ground_grid_avoidance", 1)).insert(avoidance_shape)
bump_shape = circle_polygon(self.bump_diameter / 2, self.n)
self.cell.shapes(self.get_layer("indium_bump", 0)).insert(bump_shape) # bottom In bump
self.cell.shapes(self.get_layer("indium_bump", 1)).insert(bump_shape) # top In bump