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    Ngspice is an open-source mixed-level/mixed-signal electronic circuit simulator. It is a successor of the latest stable release of Berkeley SPICE, version 3f.5, which was released in 1993. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes.
    Ngspice is based on three open-source free-software packages: Spice3f5, Xspice and Cider1b1:

    SPICE is the origin of most modern electronic circuit simulators, its successors are widely used in the electronics community.
    Xspice is an extension to Spice3 that provides additional C language code models to support analog behavioral modeling and co-simulation of digital components through a fast event-driven algorithm.
    Cider adds a numerical device simulator to ngspice. It couples the circuit-level simulator to the device simulator to provide enhanced simulation accuracy (at the expense of increased simulation time). Critical devices can be described with their technology parameters (numerical models), all others may use the original ngspice compact models. It is the successor to CODECS.


    Overview




    = Analysis types

    =
    Ngspice implements three classes of analysis:

    Nonlinear DC analyses
    Nonlinear transient analyses
    Linear AC analyses
    Transient analysis includes transient noise simulation. AC analysis includes small-signal noise simulation, pole-zero and transfer function analysis:

    Noise analysis
    Small signal noise (AC)
    Transient noise
    Operating point analysis — determines the dc operating point of the circuit with inductors shorted and capacitors opened.
    Operating point sweep analysis — determines the values of output variables while one or two specified independent voltage or current source is stepped over
    Pole-zero analysis (AC)
    Small-Signal distortion analysis and frequency response analysis (AC)
    Sensitivity analysis (DC/AC)
    Transfer function analysis
    Transient analysis
    Periodic steady state analysis
    S-parameter analysis


    Device models


    Ngspice implements various circuits elements, like resistors, capacitors, inductors (single or mutual), transmission lines and a growing number of semiconductor devices like diodes, bipolar transistors, MOSFETs (both bulk and SOI), MESFETs, JFETs and HFETs.


    = Netlists

    =
    Ngspice supports parametric netlists (i.e. netlists can contain parameters and expressions). PSPICE compatible parametric macromodels, often released by manufacturers, can be imported as-is into the simulator. Polynomial sources are available. Ngspice provides an internal scripting language to facilitate complex simulation and evaluation control flows.


    = Defining new models

    =
    For mixed signal circuit simulation ngspice allows users to create a user-defined node definition file (UDN) of a new device model interface. The implementation of the node is created and simulated by using C language with macros which is compiled by standard C/C++ compilers.
    New models can be added to the simulator using:

    Behavioral modeling: Internal B-, E-, and G-sources, as well as R, C and L devices, offer modeling by mathematical expressions, driven by node voltages, branch currents, parameters and constants.
    The Xspice codemodel interface: This is a C-code interface that helps the modeling process by simplifying the access to simulator's internal structure.
    Verilog-A compact models: OSDI interface for dynamically loading OpenVAF compiled Verilog-A models.
    C language coded models with spice format: As an open-source project, Ngspice allows new models to be linked to the sources and compiled.


    Development


    Ngspice may be compiled into a shared library (*.dll or *.so) readily to be integrated into a calling program. Its interface provides access to all simulation parameters, input and output data. tclspice, another shared library version, offers an interface to Tcl/Tk (software) for better integration with software like XCircuits.
    Ngspice is licensed under the BSD-3-Clause license. This permissive open source license allows its integration as a simulation engine into several — proprietary or free/libre — EDA tools such as KiCad, EAGLE (program), CoolSPICE, Altium and others.
    Ngspice has a command line input interface and offers plotting capability. An open source GUI with schematic entry, simulation and plotting is provided by Qucs-S.
    Ngspice progress was presented at FOSDEM and FSiC conferences in 2019.


    See also



    LTspice
    Comparison of EDA Software
    List of free electronics circuit simulators


    Notes




    References




    External links


    Official website
    Ngspice on SourceForge
    ngspice manual

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NGSpice Simulation - Simulation Series Part Five - YouTube

NGSpice Simulation - Simulation Series Part Five - YouTube

ngspice final hd - YouTube

ngspice final hd - YouTube

NGSPICE: Download, Install, and Optimize Circuit Simulation | Step-by ...

NGSPICE: Download, Install, and Optimize Circuit Simulation | Step-by ...

Ngspice Tutorial #4 (Op amp in Ngspice / Active Filter / AC sweep ...

Ngspice Tutorial #4 (Op amp in Ngspice / Active Filter / AC sweep ...

ngspice · GitHub

ngspice · GitHub

Post processing the ngspice simulation outputs using Python

Post processing the ngspice simulation outputs using Python

Marketplace Detail | Efabless

Marketplace Detail | Efabless

ngspicecloud is Online NGSPICE SImulator

ngspicecloud is Online NGSPICE SImulator

Download ngspice

Download ngspice

Ngspice Tutorial - Microlab Classes

Ngspice Tutorial - Microlab Classes

ngspice / Wiki / Home

ngspice / Wiki / Home

ngspice | Takashi Yamamiya | Flickr

ngspice | Takashi Yamamiya | Flickr

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ngspice download | SourceForge.net

Jan 11, 2020 · Download ngspice for free. Ngspice project aims to improve the spice3f5 circuit simulator.

ngspice - Browse /ng-spice-rework/44 at SourceForge.net

Dec 29, 2024 · ngspice-44 64 bit master branch, tag ngspice-44 File contents: ngspice-44.tar.gz ngspice source code, complete, compilable with LINUX, MS Windows, macOS, others ngspice …

ngspice - Browse Files at SourceForge.net

ngspice Files Brought to you by: dwarning , h_vogt , nicolati , pnenzi

ngspice / ngspice / [e011d1] - SourceForge

MAILING LISTS: ----- There are two mailing lists dedicated to the use and development of ngspice. * ngspice-users@lists.sourceforge.net: This list is the list for the users of the ngspice …

linux - How to plot current in ngspice? - Electrical Engineering …

Aug 28, 2011 · In ngspice (which is based on Berkeley Spice 3) you can only plot currents through (independent) voltage sources. These are the only currents that appear in the circuit equations …

ngspice - Browse /ng-spice-rework/44.2 at SourceForge.net

Jan 11, 2025 · ngspice-44.2 64 bit master branch, tag ngspice-44.2 Bug-fix release File contents: ngspice-44.2.tar.gz ngspice source code, complete, compilable with LINUX, MS Windows, …

ngspice - Browse /ng-spice-rework at SourceForge.net

ngspice Files Brought to you by: dwarning , h_vogt , nicolati , pnenzi

ngspice / Discussion / ngspice-users: How to use .meas result in ...

Jun 9, 2023 · It is a variant of ngspice that has been seen to run much faster with some large circuits. The difference is that the mathematical core of the simulator, code to invert sparse …

ngspice / Discussion / Help: How to save data in a file?

Jul 6, 2019 · No, ngspice does not know anything about the EXCEL format. You might use the wrdata command to write out your data in a tabular form, best done with ngspice-27 that …

ngspice - Browse /ng-spice-rework/old-releases/32 at

ngspice-32 64 bit master branch, tag ngspice-32.2 File contents: ngspice-32.tar.gz ngspice source code, complete, compilable with LINUX, MS Windows, macOS, others ng_adms_va.tar.gz …