gsim 0.0.3

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Gsim 0.0.3

a GDSFactory Simulation Plugin

Overview

Gsim bridges the gap between circuit layout design (using GDSFactory) and electromagnetic simulation (using Palace). It automates the conversion of IC component layouts into simulation-ready mesh files and configuration.

Features

• Layer Stack Extraction: Extract layer stacks from PDK definitions with a comprehensive material properties database
• Port Configuration: Convert GDSFactory ports into Palace-compatible port definitions (inplane, via, and CPW ports)
• Mesh Generation: Generate GMSH-compatible finite element meshes with configurable quality presets

Installation

pip install gsim

For development:

git clone https://github.com/doplaydo/gsim
cd gsim
pip install -e .[dev]

Quick Start

from gsim.palace import (
    get_stack,
    configure_inplane_port,
    extract_ports,
    generate_mesh,
    MeshConfig,
)

# Get layer stack from active PDK
stack = get_stack()

# Configure ports on your component
configure_inplane_port(c.ports["o1"], layer="topmetal2", length=5.0)
configure_inplane_port(c.ports["o2"], layer="topmetal2", length=5.0)

# Extract configured ports
ports = extract_ports(c, stack)

# Generate mesh
result = generate_mesh(
    component=c,
    stack=stack,
    ports=ports,
    output_dir="./simulation",
    config=MeshConfig.default(),
)

Mesh Presets

Preset	Refined Size	Max Size	Use Case
Coarse	10.0 µm	600.0 µm	Fast iteration (~2.5 elements/λ)
Default	5.0 µm	300.0 µm	Balanced accuracy (~5 elements/λ)
Fine	2.0 µm	70.0 µm	High accuracy (~10 elements/λ)

Port Types

• Inplane ports: Horizontal ports on single metal layer for CPW gaps
• Via ports: Vertical ports between two metal layers for microstrip structures
• CPW ports: Multi-element ports for proper Coplanar Waveguide excitation

Documentation

See the documentation for detailed API reference and examples.

License

Copyright 2026 GDSFactory