klayout-pex-plugin-elmer

Elmer FEM electrostatics cases from KLayout-PEX PEX25D scenes: the capacitance matrix of every net, floating conductor and the ground plane, by FEM (StatElecSolver).

Usage

pip install klayout-pex-plugin-elmer
pex25d export cell.pex25d --to elmer --out_dir case
cd case && ElmerGrid 14 2 mesh.msh -autoclean && ElmerSolver case.sif

• Output of the exporter:
  • case.sif
  • mesh.msh and mesh.json, from klayout-pex-plugin-gmsh
• Running it: ElmerGrid converts the mesh into the directory mesh/, which case.sif reads.
• Result: cmatrix.dat
  • mutual capacitances off the diagonal
  • capacitance to ground on the diagonal, which is zero with the default outer_boundary
  • body i is the group with tag i in mesh.json
• IIC-OSIC-TOOLS doesn't include Elmer.

Options

The mesh options of klayout-pex-plugin-gmsh, plus:

Pass them with pex25d export --option NAME=VALUE (klayout-pex 0.6.3 or later) or options={...} in Python.

Elements are linear. On the same mesh, the matrix matches Palace with order 1.

Development

poetry install    # uses ../klayout-pex-plugin-gmsh until it is on PyPI
poetry run pytest # runs ElmerGrid and ElmerSolver too, if they are on PATH