from __future__ import annotations
from functools import partial
from gdsfactory.cell import cell
from gdsfactory.component import Component
from gdsfactory.components.compass import compass
from gdsfactory.components.via_stack import via_stack_slab_npp_m3
from gdsfactory.typings import ComponentSpec, Floats, LayerSpecs
pad_via_stack_slab_npp = partial(via_stack_slab_npp_m3, size=(80, 80))
[docs]
@cell
def resistance_sheet(
width: float = 10,
layers: LayerSpecs = ("SLAB90", "NPP"),
layer_offsets: Floats = (0, 0.2),
pad: ComponentSpec = pad_via_stack_slab_npp,
pad_pitch: float = 100.0,
ohms_per_square: float | None = None,
port_orientation1: int = 180,
port_orientation2: int = 0,
) -> Component:
"""Returns Sheet resistance.
keeps connectivity for pads and first layer in layers
Args:
width: in um.
layers: for the middle part.
layer_offsets: from edge, positive: over, negative: inclusion.
pad: function to create a pad.
pad_pitch: in um.
ohms_per_square: optional sheet resistance to compute info.resistance.
port_orientation1: in degrees.
port_orientation2: in degrees.
"""
c = Component()
pad = pad()
length = pad_pitch - pad.info.xsize
pad1 = c << pad
pad2 = c << pad
r0 = c << compass(
size=(length + layer_offsets[0], width + layer_offsets[0]), layer=layers[0]
)
c.absorb(r0)
for layer, offset in zip(layers[1:], layer_offsets[1:]):
r = c << compass(size=(length + 2 * offset, width + 2 * offset), layer=layer)
c.absorb(r)
pad1.connect("e3", r0.ports["e1"], allow_layer_mismatch=True)
pad2.connect("e1", r0.ports["e3"], allow_layer_mismatch=True)
c.info["resistance"] = ohms_per_square * width * length if ohms_per_square else 0
c.add_port(
"pad1",
port_type="vertical_dc",
center=pad1.center,
layer=list(layers)[-1],
width=width,
orientation=port_orientation1,
)
c.add_port(
"pad2",
port_type="vertical_dc",
center=pad2.center,
layer=list(layers)[-1],
width=width,
orientation=port_orientation2,
)
c.absorb(pad1)
c.absorb(pad2)
return c
if __name__ == "__main__":
# import gdsfactory as gf
# sweep = [resistance_sheet(width=width, layers=((1,0), (1,1))) for width in [1, 10, 100]]
# c = gf.pack(sweep)[0]
c = resistance_sheet()
c.show(show_ports=True)
# import gdsfactory as gf
# sweep_resistance = list(map(resistance_sheet, (5, 10, 80)))
# c = gf.grid(sweep_resistance)
# c.show(show_ports=True)
