Adding an external .gds file as a cell

[Diego-planckian1]

Hi,

my company is working with an external research center ( VTT indeed :) ), which provides us a .gds file that has to be inserted as a cell without modifications (geometries, layers, ect.). How can I do it within the KQCircuits package?

[qpavsmi]

If the external .gds file is an entire chip that you want to include in the wafer, then it is as simple as giving a filepath string in the mask script.

But seems that you want to include an element within the KQCircuits chip? I've given instructions in the past about using a .gds file to insert a qubit in the chip here: #83 (comment) Let me know if this works for you. In summary, place the .gds file either in klayout_package/python/kqcircuits/qubits if it is specifically a qubit or to klayout_package/python/kqcircuits/elements if it is just an element. Then using the code snippet you should be able to make KQC fetch that geometry and place it at the needed location.

[Diego-planckian1]

It doesn't seem to work. The discussion you link was for an .oas file... maybe that is the problem?

[qpavsmi]

I didn't have issues if I mixed .oas and .gds files before...

Are you able to see your element listed on the Element Library panel (bottom left in KLayout) and are you able to drag-and-drop it into the layout?

[Diego-planckian1]

I saved the wanted file as .oas and it worked!

the sizes are wrong... what can i modify?

[qpavsmi]

OK, good to know that the file format was the issue :D

After self.layout.create_cell and before self.insert_cell, try adding this line:

qubit_cell = self.layout.create_cell("somequbit", Qubit.LIBRARY_NAME)
qubit_cell.transform(pya.DCplxTrans(0.1))  # shrinks to 10% (0.1) of the size
self.insert_cell(qubit_cell, pya.DTrans(0, False, 5000, 5000), "qb_0")

[Diego-planckian1]

It works! thank you again!