chipify 0.2.1

High-Performance Mismatch Simulation Wrapper for Xschem and Ngspice

Chipify

(c) 2026 Santiago Hofwimmer BSc

Institute for Integrated Circuits and Quantum Computing, Johannes Kepler University (JKU), Linz, Austria

Link to repository

Link to Youtube Channel (tutorials following soon)

[!WARNING] This repository is a Work in Progress.

[!IMPORTANT] It is recomended to use the IIC-OSIC-TOOLS container. Otherwise, you have to install Ngspice, Xschem and IHP-Open-PDK manually as prerequisites.

[!IMPORTANT] Currently, only the IHP-Open-PDK is fully supported, but more will follow soon

Chipify is a high-performance EDA (Electronic Design Automation) tool for mismatch simulations, parameter sweeping, and yield analysis. It wraps Xschem (schematic capture) and Ngspice (circuit simulation) to automate Monte-Carlo and corner sweeps, run them in parallel, and turn the raw results into plots, yield matrices, and reports.

It ships with both a PySide6 (Qt) desktop GUI and a headless CLI, plus a plugin system for custom plots, reports, and expressions.

Features

• Parallel sweeps — multiprocessing pool runs Monte-Carlo / corner cases across all cores.
• Datasheet-driven — describe parameters, tests, and pass/fail specs in a single YAML file.
• Range DSL — range, linspace, and logspace parameter sweeps (safely parsed, no eval).
• Yield & statistics — pass/fail yield, histograms with distribution fits, corner yield matrices.
• Safe custom expressions — derive new metrics with a sandboxed evaluator (no arbitrary code execution).
• Reports — export to PDF, Markdown, and LaTeX; PNG/SVG plot exporters.
• Pluggable — add your own plots, reports, expressions, and exporters (see PLUGINS.md).
• Multi Plot Dashboard - arrange a selection of plots on a second window.

Prerequisites

Chipify is a wrapper around external EDA tools, so these must be installed and available on your PATH:

• Python 3.11+

• Ngspice — the SPICE simulator

• Xschem — schematic capture / netlist generation

• (optional) VACASK + PyOPUS — alternative simulation backend

• (Linux) PySide6 system libraries — Qt needs a few shared libraries that pip can't install:

  • libegl1 / libgl1 (libEGL.so.1 / libGL.so.1) are dlopened when Qt is imported — required even for the headless test suite. Without them you get ImportError: libEGL.so.1: cannot open shared object file.
  • libxcb-cursor0 (Qt ≥ 6.5) is needed by the xcb/XWayland platform for the on-screen GUI; without it a Wayland session falls back to native Wayland, where dropdown menus don't close on selection.

  install.sh installs all of these automatically on Debian/Ubuntu; elsewhere install them with your package manager (e.g. apt install libegl1 libgl1 libxcb-cursor0). System libraries can't be declared in setup.py/pyproject.toml, so they're handled by install.sh.

It is highly recommended to install and run Chipify inside the IIC-OSIC-TOOLS docker container. This way, all the required tools plus a bunch of open source PDKs are already installed.

Installation

git clone https://github.com/santihofi/chipify.git
bash install.sh

Optional extras:

pip install ".[fast]"     # numexpr — vectorized transient-equation evaluation
pip install ".[vacask]"   # PyOPUS — VACASK simulation backend

For development, install in editable mode: pip install -e . (On Linux/macOS, install.sh is a one-line convenience wrapper for the venv + install steps above.)

Quick start

Desktop GUI

chipify

This opens the desktop application where you can edit datasheets, launch sweeps, and explore results interactively.

Headless CLI

See examples/datasheet.yaml for a documented datasheet template (and examples/README.md for how to run it). Place your datasheet YAML in the input folder (datasheets/ by default), then:

chipify-cli -c my_design.yaml          # run a single datasheet
chipify-cli --batch ./datasheets       # run every *.yaml in a directory
chipify-cli -c my_design.yaml --json   # also print a JSON summary (handy for CI)
chipify-cli -c my_design.yaml --markdown report.md

Results are written to the output folder (out/ by default), including simulation_results.csv and any generated reports. Run chipify-cli --help for the full list of options.

Configuration

User preferences are stored in settings.json in the directory you launch Chipify from (CPU cores, simulator engine, theme, live plotting, …). The file is created/updated by the GUI's settings dialog. Custom equations live in the datasheet YAML (equations: / transient_equations:), not in settings.json.

Folder paths

By default Chipify uses this layout under the working directory:

Folder	settings.json key	Default
Input datasheets	in_dir	datasheets/
Simulation output	out_dir	out/
Model files (*.lib/*.mod/*.inc staged for simulation)	work_dir	work/
Testbench files	tb_dir	tb/

To relocate any of them, set the corresponding key in settings.json to an absolute or relative path, e.g.:

{
  "out_dir": "results",
  "in_dir": "/data/chipify/datasheets"
}

Any key that is missing or blank falls back to its default. Paths are resolved when Chipify starts, so changes take effect on the next launch.

Running the example project

A source follower example is included. to run the example, navigate to /chipify/examples/source_follower and run chipify in this directory. You can select between two datasheets describing a corner case and a mismatch simulation.

Project layout

chipify/            # engine (no GUI-toolkit deps)
  cli.py            # CLI entry point + GUI launcher
  simulator.py      # multiprocessing simulation engine
  schema.py         # datasheet validation + range DSL
  expression.py     # sandboxed expression evaluation
  settings.py       # project folder paths (configurable via settings.json)
  app_config.py     # persistent preferences + logging
  data_loader.py    # results loading / pass-fail / history (shared, headless)
  uikit/            # toolkit-agnostic GUI-support layer (state, services, plugin facade)
  gui_qt/           # PySide6 (Qt) desktop GUI (tabs / controllers / workers / widgets)
tests/              # pytest suite for the core engine + GUI smoke tests

See context.md for the full architecture overview and PLUGINS.md for the plugin API.

Development

pip install -e .
pytest                                   # run the test suite
python -m mypy chipify/settings.py       # strict type-checking (see pyproject.toml)

License

Licensed under the Apache License 2.0.