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Simulate electronic circuit using Python and the Ngspice / Xyce simulators

Project description

PySpice license PySpice python version

PySpice last version


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 PySpice Home Page.

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 installation section in the documentation.


Authors: Fabrice Salvaire


V1.4.0 (development release)

V1.3.2 (production release) 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 A XSPICE device

  • Implemented missing transmission line devices

  • Implemented high level current sources Notice: Some classes were renamed !

  • Implemented node kwarg e.g. 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. 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 U_μV(U_mV(1)) to easily convert values

    • Added U_mV, … shortcuts

    • Added Numpy array support to unit, see UnitValues Notice: this new feature could be buggy !!!

    • Rebased WaveForm to UnitValues

  • Fixed node order so as to not confuse users Now PySpice matches SPICE order for two ports elements !

  • Fixed device shortcuts in Netlist class

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

  • Fixed subcircuit nesting

  • Outsourced documentation generator to Pyterate

  • Updated for wheel

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 format 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 u_mV or compute the value of 1.2@u_kΩ / 2@u_mA. The relevant documentation is on this page.

  • 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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