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335 Stars 116 Forks GNU General Public License v3.0 1.0K Commits 135 Opened issues


Simulate electronic circuit using Python and the Ngspice / Xyce simulators

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PySpice : Simulate Electronic Circuit using Python and the Ngspice / Xyce Simulators

|Pypi License| |Pypi Python Version|

|Pypi Version|

|Anaconda Version| |Anaconda Downloads|

|Tavis CI master|

Quick Links

  • Production Branch 
  • Devel Branch 
  • Travis CI 
  • [email protected] 
  • conda-forge/pyspice 
  • [email protected] 
  • Ngspice 
  • Ngspice Bug Tracker 
  • Xyce of Sandia National Laboratories 

Brief Notes

Thanks to

_, PySpice now has a Forum hosted at

Disclaimer: PySpice is developed on my free time actually, so I could be busy with other tasks and less reactive.

An issue was found with NgSpice Shared, we must

setlocale(LC_NUMERIC, "C");


What is PySpice ?

PySpice is a Python module which interface |Python|_ to the |Ngspice|_ and |Xyce|_ circuit simulators.

Where is the Documentation ?

The documentation is available on the |PySpiceHomePage|_.

Note: This site is hosted on my own infrastructure, if the site seems done, please create an issue to notify me.

Where to get help or talk about PySpice ?

Thanks to

_, PySpice now has a Forum hosted at

What are the main features ?

  • support Ngspice and Xyce circuit simulators
  • support Linux, Windows and Mac OS X platforms
  • licensed under GPLv3 therms
  • implement an Ngspice shared library binding using CFFI which support external sources
  • implement (partial) SPICE netlist parser
  • implement an Oriented Object API to define circuit
  • export simulation output to |Numpy|_ arrays
  • plot using |Matplotlib|_
  • handle units
  • work with Kicad schematic editor
  • implement a documentation generator
  • provides many examples

How to install it ?

Look at the

_ section in the documentation.

Pull Request Recommendation

To make it easier to merge your pull request, you should divide your PR into smaller and easier-to-verify units.

Please do not make a pull requests with a lot of modifications which are difficult to check. If I merge pull requests blindly then there is a high risk this software will become a mess quickly for everybody.



Fabrice Salvaire 
_ and


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V1.6.0 (development release)

  • KiCadTools a proof of concept module to read KiCad 6
    schema file and compute the netlist. This module can be used to perform any kind of processings on a KiCad schema. It is actually hosted in the source but could become a standalone project. For PySpice, it provides a very flexible way to draft a circuit with the help of KiCad and then generate the netlist without using the netlist export feature of KiCad. And thus leverage the writing of fastidious cicruit.

V1.5.0 (production release) 2021-05-15

  • Support Ngspice up to version 34
  • Renamed custom dunders "dunder" to "CONSTANT" or "_private" class attributes
  • Fixed typo in documentation (thanks to endolith and brollb)
  • Add DC temperature sweep support #272 (thanks to Fatsie)
  • PWL support improvements #271 (thanks to Fatsie)
  • Assign units on creation of temperature-sweep vectors #263 (thanks to ARF1)
  • Prevent memory leaks by freeing ngspice command log #260 thanks to ARF1)
  • Performance optimization: dispatch multiple alter commands jointly #259 (thanks to ARF1)
  • Added spice library support #258 (thanks to Fatsie)
  • Allow to specify DC value for PWL #257 (thanks to Fatsie)
  • Support for
    type initial condition #256 (thanks to Fatsie)
  • Fix accuracy problems #254 (thanks to sotw1957)
  • Changes to make it easier to use PySpice with a large archive of SPICE models medium diff #249 (thanks to xesscorp)
    : Fix wrong method when joining parameters during netlist parse #245 (thanks to cyber-g)
  • Unit: add Pickle support
  • Add Parser code from #136 (thanks to jmgc) but not yet merged
  • Unit: add np.mean

V1.4.3 2020-07-04

A huge effort, thanks to @stuarteberg Stuart Berg, has been made to make Ngspice and PySpice available on Anaconda (conda-forge) for the Window, OSX and Linux platforms. Thanks to the conda-forge continuous integration platform, we can now run unit tests and the examples on theses platforms automatically. Hope this will make the software more robust and easier to run !

  • PySpice is now available on Anaconda(conda-forge) as well as a wheel on PyPI
  • Added a post installation tool to download the Ngspice DLL on Windows and to check the installation. It should now simplify considerably the PySpice installation on Windows.
  • This tool can also download the examples and the Ngspice PDF manual.
  • On Linux and OSX, a Ngspice package is now available on Anaconda(conda-forge). Note that theses two platforms do not download a binary from Ngspice since a compiler can easily be installed on theses platforms.
  • Updated installation documentation for Linux, the main distributions now provide a ngspice shared package.

  • Added a front-end web site so as to keep older releases documentation available on the web.

  • fixed and rebuilt all examples (but mistakes could happen ...)

  • examples are now available as Python files and Jupyter notebooks (but some issues must be fixed, e.g. due to the way Jupyter handles Matplotlib plots)

  • support NgSpice 32 API (no change)

  • removed @[email protected] in PySpice/, beacause it breaks pip install from git

  • fixed some logging spams

  • fixed NonLinearVoltageSource

  • fixed Unicode issue with °C (° is Extended ASCII)

  • fixed ffistringutf8 for UnicodeDecodeError

  • fixed logging formater for OSX (removed ANSI codes)

  • reworded "Invalid plot name" exception

  • removed diacritics in example filenames

  • cir2py has been converted to an entry point so as to work on all platforms

  • updated Matplotlib subplots in examples

  • added a unit example

  • added a NMOS example (thanks to cyber-g) cf. #221

V1.4.0 2020-05-05

This release is yanked due to broken Windows support.

  • fixed nasty issue with NgSpice shared for
    setlocale(LC_NUMERIC, "C");
    cf. #172
  • fixed
    for new NgSpice syntax
  • fixed
  • fixed
  • fixed docstrings for element shortcut methods (thanks to Kyle Dunn) #178
  • fixed parser for leading whitespace (thanks to Matt Huszagh) #182
  • fix for PyYAML newer API
  • support NgSpice 31 API (no change)
  • added check for
  • added
    tool to help to fix broken installation
  • added pole-zero, noise, distorsion, transfer-function analyses (thanks to Peter Garrone) #191
  • added
    support (thanks to ceprio) #160
  • added
    parameter to
  • added
    command method to
  • added Xyce Mosfet nfin #177

V1.3.2 2019-03-11

  • support Ngspice 30 and Xyce 6.10
  • fixed NgSpice and Xyce support on Windows 10
  • bug fixes

V1.2.0 2018-06-07

  • Initial support of the |Xyce|_ simulator. Xyce is an open source, SPICE-compatible, high-performance analog circuit simulator, capable of solving extremely large circuit problems developed at Sandia National Laboratories. Xyce will make PySpice suitable for industry and research use.
  • Fixed OSX support
  • Splitted G device
  • Implemented partially
    XSPICE device
  • Implemented missing transmission line devices
  • Implemented high level current sources Notice: Some classes were renamed !
  • Implemented node kwarg e.g. :code:
    circuit.Q(1, base=1, collector=2, emitter=3, model='npn')
  • Implemented raw spice pass through (see
    User FAQ 
  • Implemented access to internal parameters (cf. :code:
    save @device[parameter]
  • Implemented check for missing ground node
  • Implemented a way to disable an element and clone netlist
  • Improved SPICE parser
  • Improved unit support:

    • Implemented unit prefix cast
      to easily convert values
    • Added
      , ... shortcuts
    • Added Numpy array support to unit, see
      Notice: this new feature could be buggy !!!
    • Rebased
  • Fixed node order so as to not confuse users Now PySpice matches SPICE order for two ports elements !

  • Fixed device shortcuts in

  • Fixed model kwarg for BJT Notice: it must be passed exclusively as kwarg !

  • Fixed subcircuit nesting

  • Outsourced documentation generator to |Pyterate|_

  • Updated
    for wheel

.. :ref:


V1.1.0 2017-09-06

  • Enhanced shared mode
  • Shared mode is now set as default on Linux

V1.0.0 2017-09-06

  • Bump version to v1.0.0 since it just works!
  • Support Windows platform using Ngspice shared mode
  • Fixed shared mode
  • Fixed and completed Spice parser : tested on example's libraries


  • Fixed Spice parser for lower case device prefix.

V0.4.0 2017-07-31

  • Git repository cleanup: filtered generated doc and useless files so as to shrink the repository size.
  • Improved documentation generator: Implemented :code:
    for RST content and Tikz figure.
  • Improved unit support: It implements now the International System of Units. And we can now use unit helper like :code:
    or compute the value of :code:
    [email protected]_kΩ / [email protected]_mA
    . The relevant documentation is on this
  • Added the Simulation instance to the Analysis class.
  • Refactored simulation parameters as classes.

V0.3.2 2017-02-22

  • fixed CCCS and CCVS

V0.3.1 2017-02-22

  • fixed ngspice shared

V0.3.0 2015-12-08

  • Added an example to show how to use the NgSpice Shared Simulation Mode.
  • Completed the Spice netlist parser and added examples, we could now use a schematic editor to define the circuit. The program cir2py translates a circuit file to Python.

V0 2014-03-21

Started project

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