# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
#
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from autologging import logged
from kqcircuits.elements.flip_chip_connectors import connector_type_choices
from kqcircuits.elements.flip_chip_connectors.flip_chip_connector import FlipChipConnector
from kqcircuits.elements.flip_chip_connectors.flip_chip_connector_dc import FlipChipConnectorDc
from kqcircuits.elements.launcher import Launcher
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt
[docs]@logged
class FlipChipConnectorRf(FlipChipConnector):
"""PCell declaration for an inter-chip rf connector.
Flip chip connector with two coplanar waveguide connections and different ground bump configurations.
The input port is on the first face and on the left. The output port is on the second face and rotated as chosen.
About connector_type choices:
* ``Single``: the bump connects the two sides
* ``GSG``: ground-signal-ground indium bumps
* ``Coax``: signal transmitting bump is surrounded by four ground bumps
.. MARKERS_FOR_PNG 0,0 15,0 0,-40 -28,0
"""
connector_type = Param(pdt.TypeString, "Connector type", "Coax", choices=connector_type_choices)
inter_bump_distance = Param(pdt.TypeDouble, "Distance between In bumps", 100, unit="μm")
output_rotation = Param(pdt.TypeDouble, "Rotation of output port w.r.t. input port", 180, unit="degrees")
connector_a = Param(pdt.TypeDouble, "Conductor width at the connector area", 40, unit="μm")
connector_b = Param(pdt.TypeDouble, "Gap width at the connector area", 40, unit="μm")
round_connector = Param(pdt.TypeBoolean, "Use round connector shape", False)
n_center_bumps = Param(pdt.TypeInt, "Number of center bumps in series", 1)
[docs] def build(self):
# Flip-chip bump
bump = self.add_element(FlipChipConnectorDc, face_ids=self.face_ids)
for i in range(self.n_center_bumps):
self.insert_cell(bump, pya.DTrans((i - (self.n_center_bumps - 1) / 2) * self.inter_bump_distance, 0))
bump_ref = self.get_refpoints(bump)
self.__log.debug("bump_ref: %s", bump_ref)
tt = pya.DCplxTrans(1, self.output_rotation, False, 0, 0) # top transformation
if self.round_connector:
# Rounded geometry
def rounded_plate_with_trace(trace_x, plate_x, trace_width, plate_width, plate_length):
reg = pya.Region(pya.DBox(plate_x - plate_length / 2, -plate_width / 2,
plate_x + plate_length / 2, plate_width / 2).to_itype(self.layout.dbu))
reg.round_corners(0, min(plate_width, plate_length) / (2 * self.layout.dbu), self.n)
reg += pya.Region(pya.DBox(trace_x, -trace_width / 2,
plate_x, trace_width / 2).to_itype(self.layout.dbu))
return reg
w = self.connector_a + 2 * self.connector_b
l = w + (self.n_center_bumps - 1) * self.inter_bump_distance
region = rounded_plate_with_trace(-l/2, 0, self.a + 2 * self.b, w, l)
avoid_region = region.sized(self.margin / self.layout.dbu, self.margin / self.layout.dbu, 2)
for i in range(self.n_center_bumps):
region -= rounded_plate_with_trace(-l/2, (i - (self.n_center_bumps - 1) / 2) * self.inter_bump_distance,
self.a, self.connector_a, self.connector_a)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid", 0)).insert(region)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid",
1)).insert(region.transformed(pya.ICplxTrans(tt)))
self.add_protection(avoid_region)
self.add_protection(avoid_region.transformed(pya.ICplxTrans(tt)), 1, 0)
# add reference point
self.add_port("{}_port".format(self.face_ids[0])
, pya.DPoint(-l/2, 0), pya.DVector(-1, 0), 0)
self.add_port("{}_port".format(self.face_ids[1]),
tt * pya.DPoint(-l/2, 0), tt * pya.DVector(-1, 0), 1)
else:
# Taper geometry
s = self.ubm_diameter + (self.n_center_bumps - 1) * self.inter_bump_distance
trans = pya.DCplxTrans(1, 0, False, bump_ref["base"] + pya.DPoint(- self.ubm_diameter - s / 2, 0))
self.insert_cell(Launcher, trans, self.face_ids[0], s=s, l=self.ubm_diameter,
a_launcher=self.connector_a, b_launcher=self.connector_b,
launcher_frame_gap=self.connector_b)
self.insert_cell(Launcher, tt * trans, self.face_ids[1], s=s, l=self.ubm_diameter,
a_launcher=self.connector_a, b_launcher=self.connector_b,
launcher_frame_gap=self.connector_b, face_ids=[self.face_ids[1],
self.face_ids[0]])
# Insert ground bumps
if self.connector_type == "GSG":
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(0, self.inter_bump_distance)))
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(0, -self.inter_bump_distance)))
elif self.connector_type == "Coax":
dist_y = 0.5**0.5 * self.inter_bump_distance
dist_x = dist_y + self.inter_bump_distance * (self.n_center_bumps - 1) / 2
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(dist_x, dist_y)))
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(-dist_x, dist_y)))
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(dist_x, -dist_y)))
self.insert_cell(bump, pya.DCplxTrans(1, 0, False, pya.DPoint(-dist_x, -dist_y)))