examples: Improve mesh sizing for DemoQPU17 (#74)

Author: gpeairs

.gitignore

@@ -10,4 +10,6 @@ Manifest.toml
 .vscode/
 .DS_Store
 .gitlab-ci-local
-coverage/
+coverage/
+*.xao
+*.msh2

CHANGELOG.md

@@ -8,6 +8,7 @@ The format of this changelog is based on
 
   - `SolidModels.check_overlap` now skips empty groups
   - Built-in components `Spacer`, `ArrowAnnotation`, and `WeatherVane` now default to coordinate type `typeof(1.0UPREFERRED)` if no coordinate type is specified in the constructor
+  - Improvements to ExamplePDK/DemoQPU17 component mesh sizing
   - Minor documentation improvements
 
 ## 1.4.0 (2025-07-01)

docs/src/examples/qpu17.md

@@ -380,7 +380,7 @@ LINE_SPECIFICATIONS = [# Manual port assignment, we'll just list them out
     ("Z", (3, 5), [Point(5000, -1800)]μm),
     ("XY", (3, 4), [Point(4600, -2300)]μm),
     ("Z", (3, 4), [Point(4600, -3000)]μm),
-    ("XY", (4, 4), [Point(4200, -3000)]μm),
+    ("XY", (4, 4), [Point(3300, -2100)]μm),
     # SE corner
     ("Z", (4, 4), [Point(4100, -4200)]μm),
     ("XY", (5, 4), [Point(4100, -4600)]μm),
@@ -704,7 +704,7 @@ Many quantum devices fill the ground plane with small holes to reduce loss assoc
 ```julia
 #### Autofill with ground plane holes
 hole_cs = CoordinateSystem("gnd_hole") # Coordinate system for a single hole
-place!(hole_cs, Circle(GROUND_HOLE_RADIUS), METAL_NEGATIVE)
+place!(hole_cs, not_simulated(Circle(GROUND_HOLE_RADIUS)), METAL_NEGATIVE)
 bnds = bounds(schematic, find_components(ExampleChip, schematic)...) # bounds of the chip node
 exclusion = make_halo(50μm; ignore_layers=[CHIP_AREA]) # function to create exclusion area
 x_grid = (lowerleft(bnds).x + 600μm):GROUND_HOLE_SPACING:(upperright(bnds).x - 600μm) # raster x-coordinates

examples/DemoQPU17/DemoQPU17.jl

@@ -152,7 +152,7 @@ function qpu17_demo(; savegds=true, dir=pwd())
 
     #### Autofill with ground plane holes
     hole_cs = CoordinateSystem("gnd_hole") # Coordinate system for a single hole
-    place!(hole_cs, Circle(GROUND_HOLE_RADIUS), METAL_NEGATIVE)
+    place!(hole_cs, not_simulated(Circle(GROUND_HOLE_RADIUS)), METAL_NEGATIVE)
     bnds = bounds(schematic, find_components(ExampleChip, schematic)...) # bounds of the chip node
     exclusion = make_halo(50μm; ignore_layers=[CHIP_AREA]) # function to create exclusion area
     x_grid = (lowerleft(bnds).x + 600μm):GROUND_HOLE_SPACING:(upperright(bnds).x - 600μm) # raster x-coordinates

examples/DemoQPU17/Project.toml

@@ -0,0 +1,5 @@
+[deps]
+DeviceLayout = "ebf59a4a-04ec-49d7-8cd4-c9382ceb8e85"
+FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"
+JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"

examples/DemoQPU17/params.jl

@@ -149,7 +149,7 @@ function qpu_params()
         ("Z", (3, 5), [Point(5000, -1800)]μm),
         ("XY", (3, 4), [Point(4600, -2300)]μm),
         ("Z", (3, 4), [Point(4600, -3000)]μm),
-        ("XY", (4, 4), [Point(4200, -3000)]μm),
+        ("XY", (4, 4), [Point(3300, -2100)]μm),
         # SE corner
         ("Z", (4, 4), [Point(4100, -4200)]μm),
         ("XY", (5, 4), [Point(4100, -4600)]μm),

src/schematics/ExamplePDK/components/ChipTemplates/ChipTemplates.jl

@@ -52,13 +52,13 @@ A `Component` with rectangular geometry in the CHIP_AREA layer and uniformly spa
 end
 
 function SchematicDrivenLayout._geometry!(cs::CoordinateSystem, c::ExampleChip)
-    return place!(
-        cs,
-        OptionalStyle(DeviceLayout.NoRender(), DeviceLayout.Plain(), :artwork, false)(
-            centered(Rectangle(c.length_x, c.length_y))
-        ),
-        CHIP_AREA
-    )
+    chip_rect = centered(Rectangle(c.length_x, c.length_y))
+    # only_simulated would make these invisible to `bounds`, which we don't want
+    # so these render by default and ignore for artwork
+    not_artwork =
+        OptionalStyle(DeviceLayout.NoRender(), DeviceLayout.Plain(), :artwork, false)
+    place!(cs, not_artwork(chip_rect), CHIP_AREA)
+    return place!(cs, not_artwork(chip_rect), WRITEABLE_AREA)
 end
 
 function SchematicDrivenLayout.hooks(c::ExampleChip)
@@ -89,10 +89,11 @@ end
 """
     example_launcher(port_spec)
 
-Create a coplanar-waveguide "launcher" in `METAL_NEGATIVE` created using `launch!` with its defaults.
+Create a coplanar-waveguide "launcher" in `METAL_NEGATIVE` created using `launch!`.
 
 Returns a `Path` named `"launcher_\$role_\$target"`, where `role` and `target` are the first two
-elements of `port_spec`. Hooks are given by [`hooks(::Path)`](@ref).
+elements of `port_spec`. Hooks are given by [`hooks(::Path)`](@ref). Uses default parameters
+for `launch!` with rounding turned off.
 
 This method exists for use in demonstrations. The launcher design is not optimized
 for microwave properties.
@@ -101,7 +102,11 @@ function example_launcher(port_spec)
     isnothing(port_spec) && return nothing
     path =
         Path(nm; name="launcher_$(port_spec[1])_$(port_spec[2])", metadata=METAL_NEGATIVE)
-    launch!(path)
+    launch!(path, extround=0μm)
+    port_cs = CoordinateSystem(uniquename("launcherport"))
+    gap0 = path[1].sty.gap # Launcher pad gap
+    render!(port_cs, only_simulated(centered(Rectangle(gap0, gap0))), PORT)
+    attach!(path, sref(port_cs), path[1].sty.gap / 2, i=1)
     return path
 end
 ###

src/schematics/ExamplePDK/components/ClawCapacitors/ClawCapacitors.jl

@@ -87,7 +87,8 @@ function SchematicDrivenLayout._geometry!(
     path = _path(cc)
     place!(cs, path)
     claw_cutout = RotationPi(1 // 2)(_series_claw(cc))
-    place!(cs, Align.rightof(claw_cutout, path, centered=true), METAL_NEGATIVE)
+    ms = MeshSized(critical_dimension(cc))
+    place!(cs, ms(Align.rightof(claw_cutout, path, centered=true)), METAL_NEGATIVE)
 
     return cs
 end
@@ -261,7 +262,8 @@ function SchematicDrivenLayout._geometry!(
     # Align claw below tap before attaching bridge, which may extend below tap
     claw_cutout = Align.below(claw_cutout, tap; centered=true)
     !isnothing(cc.bridge) && attach!(tap, sref(cc.bridge), pathlength(tap[end]) / 2)
-    place!(cs, claw_cutout, METAL_NEGATIVE)
+    ms = MeshSized(critical_dimension(cc))
+    place!(cs, ms(claw_cutout), METAL_NEGATIVE)
 
     return cs
 end

src/schematics/technologies.jl

@@ -102,7 +102,7 @@ function level_z(l::Integer; t_chips=[525μm, 525μm], t_gaps=[5μm])
     # Add up stacks above 1, subtract stacks below 1
     z_chip =
         sum(t_chips[(2):chip_idx]) + sum(t_gaps[1:(chip_idx - 1)]) -
-        (sum(t_chips[(chip_idx + 1):1]) + sum(t_gaps[chip_idx:-1]))
+        (sum(t_chips[(chip_idx + 1):1]) + sum(t_gaps[chip_idx:0]))
     if iseven(l)
         return z_chip - t_chips[chip_idx] # even is bottom of substrate
     end