# -*- coding: utf-8 -*-
# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2021.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
# This a launch structure used on BlueJayV2, used for wire bonding
# There is no CPW tee attached to this p#
# Imports required for drawing
# import numpy as np # (currently not used, may be needed later for component customization)
from qiskit_metal import draw
from qiskit_metal.toolbox_python.attr_dict import Dict
from qiskit_metal.qlibrary.core import QComponent
# Define class and options for the launch geometry
[docs]
class LaunchpadWirebond(QComponent):
"""Launch pad to feed/read signals to/from the chip.
Inherits 'QComponent' class.
.. image::
LaunchpadWirebond.png
.. meta::
Launchpad Wirebond
Creates a 50 ohm launch pad with a ground pocket cutout.
Limited but expandable parameters to control the launchpad polygons.
The (0,0) point is the center of the necking of the launch tip.
The pin attaches directly to the built in lead length at its midpoint
Pocket and pad:
Pocket and launch pad geometries are currently fixed.
(0,0) point is the midpoint of the necking of the launch tip.
Pocket is a negative shape that is cut out of the ground plane
Values (unless noted) are strings with units included, (e.g., '30um')
Sketch:
Below is a sketch of the launch
::
-----------
| \
| ---------\\
| | 0 | (0,0) pin at midpoint of necking, before the lead
| ---------//
| /
-----------
y
^
|
|------> x
.. image::
LaunchpadWirebond.png
Default Options:
* trace_width: 'cpw_width' -- Width of the transmission line attached to the launch pad
* trace_gap: 'cpw_gap' -- Gap of the transmission line
* lead_length: '25um' -- Length of the transmission line attached to the launch pad
* pad_width: '80um' -- Width of the launch pad
* pad_height: '80um' -- Height of the launch pad
* pad_gap: '58um' -- Gap of the launch pad
* taper_height: '122um' -- Height of the taper from the launch pad to the transmission line
"""
default_options = Dict(trace_width='cpw_width',
trace_gap='cpw_gap',
lead_length='25um',
pad_width='80um',
pad_height='80um',
pad_gap='58um',
taper_height='122um')
"""Default options"""
TOOLTIP = """Launch pad to feed/read signals to/from the chip."""
[docs]
def make(self):
"""This is executed by the user to generate the qgeometry for the
component."""
p = self.p
pad_width = p.pad_width
pad_height = p.pad_height
pad_gap = p.pad_gap
trace_width = p.trace_width
trace_width_half = trace_width / 2.
pad_width_half = pad_width / 2.
lead_length = p.lead_length
taper_height = p.taper_height
trace_gap = p.trace_gap
pad_gap = p.pad_gap
#########################################################
# Geometry of main launch structure
# The shape is a polygon and we prepare this point as orientation is 0 degree
launch_pad = draw.Polygon([
(0, trace_width_half), (-taper_height, pad_width_half),
(-(pad_height + taper_height), pad_width_half),
(-(pad_height + taper_height), -pad_width_half),
(-taper_height, -pad_width_half), (0, -trace_width_half),
(lead_length, -trace_width_half), (lead_length, trace_width_half),
(0, trace_width_half)
])
# Geometry pocket (gap)
# Same way applied for pocket
pocket = draw.Polygon([(0, trace_width_half + trace_gap),
(-taper_height, pad_width_half + pad_gap),
(-(pad_height + taper_height + pad_gap),
pad_width_half + pad_gap),
(-(pad_height + taper_height + pad_gap),
-(pad_width_half + pad_gap)),
(-taper_height, -(pad_width_half + pad_gap)),
(0, -(trace_width_half + trace_gap)),
(lead_length, -(trace_width_half + trace_gap)),
(lead_length, trace_width_half + trace_gap),
(0, trace_width_half + trace_gap)])
# These variables are used to graphically locate the pin locations
main_pin_line = draw.LineString([(lead_length, trace_width_half),
(lead_length, -trace_width_half)])
# Create polygon object list
polys1 = [main_pin_line, launch_pad, pocket]
# Rotates and translates all the objects as requested. Uses package functions in
# 'draw_utility' for easy rotation/translation
polys1 = draw.rotate(polys1, p.orientation, origin=(0, 0))
polys1 = draw.translate(polys1, xoff=p.pos_x, yoff=p.pos_y)
[main_pin_line, launch_pad, pocket] = polys1
# Adds the object to the qgeometry table
self.add_qgeometry('poly', dict(launch_pad=launch_pad), layer=p.layer)
# Subtracts out ground plane on the layer its on
self.add_qgeometry('poly',
dict(pocket=pocket),
subtract=True,
layer=p.layer)
# Generates the pins
self.add_pin('tie', main_pin_line.coords, trace_width)